United States         National Air and         EPA 402-R-93-093
               Environmental Protection Agency   Radiation environmental I aburatmy  August Hifi4
               Office of Radiation and Indoor Air   540 South Morris Avenue
                             MontqcmiiMy, AL:.iH115 aiOl
               Radiation
4»EPA       Environmental
               Radiation Data
               Report 74
               April-June 1993
                                              Recycled/Recyclable
                                           n, O) Printed on paper that contains
                                              at least 50% recycled fiber

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ENVIRONMENTAL




RADIATION




DATA
                    REPORT 74




                  April-June 1993
      United States Environmental Protection Agency




           Office of Radiation and Indoor Air

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                                    Preface
    Environmental Radiation Data (ERD) is compiled and distributed quarterly by the Of-
fice of Radiation and Indoor Air's National Air and Radiation Environmental Laboratory
(NAREL) in Montgomery, Alabama, and contains data from the Environmental Radiation
Ambient Monitoring System (ERAMS). Data from similar networks operated by contribut-
ing States, Canada, Mexico, and the Pan American Health Organization are reported in the
ERD when available.
    ERAMS was established in 1973 by the United States Environmental Protection Agency.
It is comprised of a nationwide network of  sampling stations that provide air, surface and
drinking water, and milk samples from which environmental radiation levels are derived.
The major emphasis for ERAMS is  upon identifying trends in the accumulation of long-
lived radionuclides in the environment.
    Sampling locations are selected to provide optimal population coverage while functioning
to monitor fallout from nuclear devices and  other forms of radioactive contamination of the
environment.  The radiation analyses performed on  these  samples include gross alpha and
gross beta levels, gamma analyses for fission products, and specific analyses  for uranium,
plutonium, strontium, iodine, radium, krypton,  and tritium.  This monitoring effort also
provides ancillary information on natural background levels and on routine and accidental
releases into the environment from stationary sources.
    The radiochemical procedures used by NAREL to analyze the ERAMS samples are con-
tained in the Eastern Environmental Radiation Facility Radiochemistry Procedures Manual
(EPA 520/5-84-006).  Station operation and sample collection are in accordance with pro-
cedures contained in the ERAMS Manual (EPA 520/5-84-007, 008, 009).
                                         in

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                             Contents




                                                                             Page





Data Reporting Rationale                                                        a-





ERAMS Data                                                                  *




1.   Air Program                                                               1




      •  Airborne Participates and Precipitation                                    1




      •  Plutonium and Uranium in Airborne Participates and Precipitation            15





      •  Krypton-85                                                             20




2.   Water Program                                                             21





      •  Surface Water                                                          21




      •  Drinking Water                                                         24





3.   External Gamma Ambient Monitoring Program                                 27





4.   Milk Program                                                             28




      •  Pasteurized Milk                                                        28





      •  Carbon-14 in Milk                                                      36

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                                           Tables

Table                                                                                       Page

 1      ERAMS Reporting Increments and Minimum Detectable Levels                           xi
        for Radionuclide Analyses

 2      Gross Beta in Airborne Participates:  April 1993                                         2

 3      Gross- Beta in Airborne Participates:  May 1993                                          4

 4      Gross Beta in Airborne Participates:  June  1993                                         6

 5      Gross Beta and Specific Gamma in Precipitation: April 1993                             8

 6      Gross Beta and Specific Gamma in Precipitation: May 1993                              10

 7      Gross Beta and Specific Gamma in Precipitation: June 1993                              12

 8      Tritium in Precipitation: April-June  1993                                               13

 9      Plutonium and Uranium In Airborne Particulates: January-June 1993 Composites         16

 10     Plutonium and Uranium Analyses In Precipitation: January-June 1993 Composites        18

 11     Tritium in Surface Water: April-June 1993                                             22

 12     Tritium in Drinking Water: April-June 1993                                            25

 13     Radionuclides in Pasteurized Milk: April 1993                                           29

 14     Radionuclides in Pasteurized Milk: May 1993                                           31

 15     Radionuclides in Pasteurized Milk: June 1993                                           33

 16     Strontium-90 in Pasteurized Milk: April 1993                                           35
                                                vu

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                      Data Reporting Rationale
    Frequently, there is little or no radioactivity in environmental media. Thus, the results
of laboratory analyses should show a distribution of negative and positive numbers about
zero. A negative value occurs when a previously determined background value is subtracted
from a sample  value that is less than that of the background.  From July 1975 to March
1991, ERAMS data were reported as calculated, whether the results were negative, zero, or
positive. Since April 1991, negative results have been denoted as "not detectable," or "ND."
For gamma analyses only, results less than the 2a counting error are also denoted as  "not
detectable."
    All data are stored in the NAREL sample database as generated,  and these values are
available for statistical evaluation. However, caution should be exercised in  the use of the
data in this report for statistical analysis, since the removal of negative numbers produces a
positive bias in the distribution of results.

Reported Error Terms
    Each reported value for  specific analyses will be accompanied by a counting error term
    at the 2
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                                       Table 1
ERAMS  Reporting  Increments  and  Minimum Detectable Levels
                          for Radionuclide Analyses
Radionuclide
Gross Alpha
t Gross Beta
Tritium
Carbon-14
Krypton-85
ft Plutonium-238,239,240
J Uranium-234,235,238
Radium-226
Strontium-90
tt Strontium-89
tt Iodine- 131
Iodine-129
Cesium-137
It Barium- 140
Potassium
Potassium-40
Media
Water
Air
Water
Precipitation
Reporting
Units
pCi/L
pCi/m3
pCi/L
nCi/m2
Reporting
Increments
1 pCi/L
0.01 pCi/m3
1 PCi/L
0.01 nCi/m2
Minimum
Detectable
Levels
2 pCi/L
0.01 pCi/m3
1 pCi/L
0.01 nCi/m2
(specific radiochemical analyses)
Water
Milk
Milk
Ambient Air
Air
Milk
Water
Air
Milk
Water
Water
Milk
Water
Milk
Milk
Water
Water
Milk
Milk
Water
Milk
Water
Milk
Water
Water
nCi/L
nCi/L
pCi/L
pCi/m3
aCi/m3
pCi/L
pCi/L
aCi/m3
pCi/L
pCi/L
pCi/L
pCi/L
pCi/L
pCi/L
pCi/L
pCi/L
pCi/L
fCi/L
pCi/L
pCi/L
pCi/L
pCi/L
g/L
g/L
pCi/L
0.1 nCi/L
0.1 nCi/L
1 pCi/L
0.1 pCi/m3
0.1 aCi/mJ
0.001 pCi/L
0.001 pCi/L
0.1 aCi/m3
0.001 pCi/L
0.001 pCi/L
0.1 pCi/L
0.1 pCi/L
0.1 pCi/L
1 pCi/L
1 pCi/L
1 pCi/L
0.1 pCi/L
0.1 fCi/L
1 pCi/L
1 pCi/L
1 pCi/L
1 pCi/L
0.1 g/L
0.1 g/L
1 pCi/L
0.2 nCi/L
0.2 nCi/L
15 pCi/L
2 pCi/m3
0.015 pCi
0.015 pCi
0.015 pCi
0.015 pCi
0.015 pCi
0.015 pCi
0.1 pCi/L
1 pCi/L
1 pCi/L
5 pCi/L
10 pCi/L
10 pCi/L
0.4 pCi/L
0.4 fCi/L
10 pCi/L
10 pCi/L
10 pCi/L
10 pCi/L
0.12 g/L
0.12 g/L
100 pCi/L
   f The value of MDL for precipitation in terms of nCi/m  would be dependent on precipitation (mm).
  ff This value of MDL for air in terms of pCi/m would be dependent on the air volume. Measurement by alpha spectroscopy
    that includes contributions of plutonium-239 and plutonium-240. MDL for all media given per sample.
   J This value of MDL for air in terms of pCi/m would be dependent on the air volume. MDL for all media given per sample.
  JJ Activity as of the day of counting.
                                            XI

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                              1.  Air Program
                     Airborne Participates and Precipitation

    Gross beta radioactivity measurements and certain specific analyses are performed on
air participates and precipitation samples as indicator measurements in assessing the general
(national) impact of all contributing sources on environmental levels of radiation.
    Airborne participates are collected continuously at field stations representing wide ge-
ographic coverage, including present and potential sources of environmental radioactivity.
Sampling sites are located throughout the United States.
    Filters (10-cm diameter synthetic fiber) from air  samplers are changed twice weekly
and field measurements are made with a G-M survey meterf at 5 hours and 29 hours after
collection to allow for radon and thoron daughter product decay. Field estimates are reported
to appropriate EPA  officials by telephone or mail depending on the activity levels found.
    The filters are sent to NAREL for more sensitive analyses in a low background beta
counter.  Gamma scans are performed on all filters showing gross beta counts greater than
IpCi/m3. The laboratory obtained values are usually lower than the field estimates due to
the decay of naturally occurring radionuclides between the times of the two measurements.
    Precipitation samples are collected at those field stations collecting air filters.  These
samples are also sent  to NAREL where they are composited monthly for gamma  scans,
tritium, and gross beta activity measurements. A composite of the March,  April, and May
precipitation samples is.analyzed for plutonium-238, -239, -240, and  uranium-234, -235, and
,238.
    A compilation of individual measurements is available from the National Air and Radi-
ation Environmental Laboratory, 540 South Morris Avenue, Montgomery, AL 36115-2601.

    Tables 2-4 contain the data from  airborne particulate samples for April-June 1993.
Tables 5-7 contain the data from precipitation samples for April-June 1993. Table 8  contains
the data from tritium in precipitation samples for April-June 1993 at  the selected sites.
  f The counts at five hours for the Montgomery, Alabama, station are performed on a low background beta counter.

                                          1

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              Table 2
Gross Beta in Airborne Participates
             April 1993
Location
AK : Anchorage
AK : Fairbanks
AK : Juneau
AL: Montgomery
AR: Little Rock
AZ: Phoenix
CA: Berkeley
CA:Los Angeles
CO: Denver
CT: Hartford
DE: Wilmington
FL : Jacksonville
FL: Miami
HI: Honolulu
IA:Iowa City
ID:Boise
ID: Idaho Falls
IL: Chicago
IN : Indianapolis
KS : Topeka
KY: Frankfort
LA: New Orleans
MA: Lawrence
ME: August a
MI: Lansing
MN : Minneapolis
MO: Jefferson City
MS: Jackson
NC: Charlotte
NC: Wilmington
ND: Bismarck
NE: Lincoln
NH: Concord
NJ:Trenton
NM: Santa Fe
NV:Las Vegas
NY: Albany
Number
of
Samples
14
17
16
9
9
8
9
9
9
9
9
7
9
8
9
9
9
9
7
8
2
5
9
8
9
4
9
9
7
6
9
4
9
9
9
9
2
5-Hour Field
Estimate
Max Min Avg
(pCi/ra3)
0.0 0.0 0.0
0.0 0.0 0.0
0.0 0.0 0.0
0.1 0.0 0.1
0.2 0.1 0.1
1.3 0.1 0.8
0.1 0.0 0.0
0.3 0.1 0.1
0.7 0.3 0.5
0.1 0.0 0.0
0.1 0.0 0.0
0.1 0.0 0.1
0.1 0.0 0.0
0.2 0.1 0.1
0.1 0.1 0.1
0.4 0.1 0.2
0.0 0.0 0.0
0.3 0.1 0.1
0.2 0.1 0.1
1.1 0.1 0.5
0.2 0.0 0.1
0.4 0.0 0.2
0.1 0.0 0.1
0.2 0.0 0.1
0.1 0.0 0.1
0.1 0.1 0.1
0.4 0.1 0.2
0.2 0.0 0.1
0.1 0.0 0.0
0.0 0.0 0.0
3.2 0.1 1.0
0.5 0.1 0.3
0.1 0.0 0.1
0.3 0.1 0.2
0.5 0.1 0.3
0.3 0.1 0.2
0.1 0.0 0.1
NAREL Lab
Measurement
Max Min Avg
(pCi/m3)
0.01 0.00 0.01
0.02 0.00 0.01
0.01 0.00 0.00
0.02 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.00
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.00
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.00
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.02 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.01 0.01 0.01

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          Table 2  (continued)

Gross Beta in Airborne Participates
                April 1993
Location
NT: Niagara Falls
NT: Syracuse
NT:Taphank
OH: Columbus
OH:Painesville
OH:Ross
OH: Toledo
OR: Portland
PA : Harr isburg
SC:Barnwell
SC: Columbia
SD: Pierre
TN:Knoxville
TN: Nashville
TX: Austin
TX:E1 Paso
DT:Salt Lake City
VA : Lynchburg
VA: Virginia Beach
WA : Olympia
WA : Spokane
WI: Madison
Number
of
Samples
7
3
8
7
9
9
9
23
9
2
8
8
9
9
9
9
8
9
3
15
18
9
5-Hour Field
Estimate
Max Min Avg
(pCi/m3)
0.1 0.0 0.1
0.0 0.0 0.0
0.1 0.0 0.1
0.2 0.0 0.1
0.2 0.0 0.1
0.0 0.0 0.0
0.3 0.1 0.2
0.4 0.0 0.0
0.3 0.0 0.2
0.0 0.0 0.0
0.4 0.1 0.2
0.5 0.1 0.3
0.9 0.1 0.4
0.4 0.0 0.2
0.2 0.0 0.1
0.9 0.0 0.6
0.4 0.0 0.2
0.3 0.1 0.2
0.1 0.1 0.1
0.2 0.0 0.1
0.4 0.1 0.2
0.2 0.0 0.1
NAREL Lab
Measurement
Max Min Avg
(pCi/m3)
0.01 0.01 0.01
0.01 0.00 0.00
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.01 0.00 0.00
0.01 0.00 0.01
0.01 0.01 0.01
0.03 0.01 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.02 0.01 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.00
0.11 0.00 0.03
0.01 0.01 0.01
        Limit for field estimates - 0.1 pCi/m3.
        Limit for laboratory measurement - 0.01 pCi/m3.
Minimum Detectable
Minimum Detectable

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             Table 3
Gross Beta in Airborne Particulates
             May 1993
Location
AK : Anchorage
AK : Fairbanks
AK : June an
AL : Montgomery
AR: Little Rock
AZ : Phoenix
CA: Berkeley
CA:Los Angeles
CO: Denver
CT: Hartford
DE : Wilmington
FL : Jacksonville
FL: Miami
HI: Honolulu
IA:Iowa City
ID:Boise
ID: Idaho Falls
IL: Chicago
IN : Indianapolis
KS : Topeka
KY: Frankfort
LA: New Orleans
MA : Lawrence
ME: August a
MI: Lansing
MN : Minneapolis
MO: Jefferson City
MS: Jackson
NC : Charlotte
NC : Wilmington
ND: Bismarck
NE : Lincoln
NH: Concord
NJ: Trenton
NM: Santa Fe
NV:Las Vegas
NY: Albany
Number
of
Samples
1
28
6
8
6
8
8
8
6
8
8
6
8
6
8
8
8
6
7
7
3
7
8
7
9
4
7
8
7
6
7
1
8
8
6
8
4
5-Hour Field
Estimate
Max Min Avg
(pCi/m3)
0.0 0.0 0.0
0.0 0.0 0.0
0.0 0.0 0.0
0.5 0.1 0.2
0.5 0.1 0.2
1.4 0.3 0.8
0.1 0.0 0.0
0.4 0.0 0.1
2.5 0.1 0.9
0.1 0.0 0.1
0.4 0.1 0.2
0.1 0.0 0.0
0.1 0.0 0.0
0.2 0.1 0.1
0.3 0.1 0.1
0.4 0.2 0.3
0.0 0.0 0.0
0.4 0.1 0.2
0.3 0.1 0.2
0.6 0.1 0.3
0.3 0.1 0.2
0.2 0.1 0.1
0.2 0.0 0.1
0.2 0.0 0.1
0.2 0.1 0.1
0.1 0.0 0.1
0.3 0.1 0.2
0.4 0.1 0.2
0.2 0.0 0.1
0.0 0.0 0.0
1.7 0.2 0.9
0.0 0.0 0.0
0.1 0.0 0.1
0.8 0.1 0.4
0.3 0.1 0.2
0.2 0.1 0.2
0.1 0.0 0.1
NAREL Lab
Measurement
Max Min Avg
(pCi/m3)
0.00 0.00 0.00
0.01 0.00 0.00
0.01 0.00 0.00
0.03 0.01 0.02
0.02 0.01 0.01
0.02 0.01 0.01
0.02 0.00 0.01
0.02 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.02 0.00 0.01
0.01 0.01 0.01
0.02 0.00 0.01
0.02 0.00 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.02 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.00
0.01 0.00 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.01 0.00 0.01
0.02 0.01 0.01
0.02 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.00
0.01 0.00 0.01
0.01 0.00 0.01
0.04 0.01 0.01
0.01 0.01 0.01

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                  Table 3 (continued)
        Gross Beta in Airborne  Participates
                        May 1993
Location
NT: Niagara Falls
NT: Syracuse
NT : Taphank
OH : Columbus
OH:Painesville
OH: Ross
OH: Toledo
OR: Port land
PA:Harrisburg
SC:Barnwell
SC : Columbia
SD: Pierre
TN:Knoxville
TN: Nashville
TX: Austin
TX:E1 Paso
DT:Salt Lake City
VA : Lynchburg
WA:01ympia
WA : Spokane
WI: Madison
Number
of
Samples
8
2
8
4
8
8
7
7
8
2
8
7
4
8
8
8
8
9
8
8
8
5-Hour Field
Estimate
Max Min Avg
(pCi/m3)
0.3 0.1 0.2
0.0 0.0 0.0
0.2 0.0 0.1
0.1 0.1 0.1
0.3 0.1 0.2
0.0 0.0 0.0
0.3 0.0 0.2
0.0 0.0 0.0
0.4 0.0 0.2
0.1 0.0 0.1
0.5 0.1 0.2
0.8 0.2 0.5
0.8 0.3 0.5
0.3 0.1 0.2
0.2 0.0 0.1
0.8 0.5 0.6
0.4 0.0 0.2
1.0 0.2 0.6
0.1 0.0 0.1
0.3 0.0 0.2
0.4 0.1 0.2
NAREL Lab
Measurement
Max Min Avg
(pCi/m3)
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.01 0.00 0.01
0.02 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.02 0.00 0.01
0.02 0.01 0.01
0.02 0.01 0.01
0.02 0.01 0.01
0.03 0.01 0.01
0.03 0.00 0.01
0.02 0.00 0.01
0.01 0.00 0.00
0.02 0.00 0.01
0.01 0.01 0.01
Minimum Detectable
Minimum Detectable
Limit for field estimates - 0.1 pCi/m .
Limit for laboratory measurement - 0.01 pCi/m3.

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             Table 4
Gross Beta in Airborne Participates
             June 1993
Location
AK: Fairbanks
AK : Juneau
AL: Montgomery
AR: Little Rock
AZ : Phoenix
CA: Berkeley
CA:Los Angeles
CO:Denver
CT: Hart ford
DE: Wilmington
FL : Jacksonville
FL: Miami
HI: Honolulu
IA:Iowa City
ID:Boise
ID: Idaho Falls
IL: Chicago
IN : Indianapolis
KS:Topeka
KY: Frankfort
LA: New Orleans
MA: Lawrence
ME: August a
MI: Lansing
MN : Minneapolis
MO: Jefferson City
MS: Jackson
NC: Charlotte
NC: Wilmington
ND: Bismarck
NE: Lincoln
NH: Concord
NJ:Trenton
NM: Santa Fe
NV:Las Vegas
NY: Albany
NY: Niagara Falls
Number
of
Samples
11
9
8
7
7
9
9
9
9
10
8
9
6
9
9
9
8
8
7
5
7
8
8
9
5
9
9
9
4
6
4
9
9
6
9
5
9
5-Hour Field
Estimate
Max Min Avg
(pCi/m3)
0.0 0.0 0.0
0.0 0.0 0.0
0.4 0.1 0.3
0.2 0.1 0.2
0.9 0.4 0.6
0.1 0.0 0.1
0.1 0.0 0.1
0.7 0.3 0.5
0.1 0.0 0.1
0.4 0.0 0.2
0.1 0.0 0.1
0.0 0.0 0.0
0.2 0.1 0.2
0.2 0.0 0.1
0.4 0.2 0.3
0.0 0.0 0.0
0.6 0.1 0.3
0.2 0.1 0.2
1.0 0.3 0.6
0.2 0.1 0.2
0.2 0.1 0.1
0.2 0.0 0.1
0.2 0.0 0.1
0.4 0.0 0.1
0.1 0.0 0.1
0.8 0.2 0.4
0.3 0.1 0.2
0.2 0.1 0.1
0.0 0.0 0.0
0.0 0.0 0.0
0.5 0.1 0.3
0.2 0.0 0.1
0.7 0.2 0.5
0.7 0.1 0.4
0.2 0.0 0.1
0.1 0.0 0.0
0.4 0.1 0.1
NAREL Lab
Measurement
Max Min Avg
(pCi/m3)
0.02 0.00 0.01
0.01 0.00 0.00
0.03 0.01 0.02
0.01 0.01 0.01
0.02 0.01 0.01
0.00 0.00 0.00
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.02 0.00 0.01
0.01 0.00 0.01
0.00 0.00 0.00
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.02 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.00 0.01
0.03 0.01 0.01
0.01 0.00 0.01
0.01 0.00 0.01

-------
                  Table 4 (continued)
        Gross Beta in Airborne Particulates
                        June 1993
Location
NY: Syracuse
NY:Yaphank
OH: Columbus
OH:Painesville
OHrRoss
OH: Toledo
OR: Portland
PA:Harrisburg
SC:Barnwell
SC: Columbia
SD: Pierre
TN:Knoxville
TN: Nashville
TX: Austin
TX:E1 Paso
UT:Salt Lake City
VA : Lynchburg
VA: Virginia Beach
WA:01ympia
W A : Spokane
HI: Madison
Number
of
Samples
3
9
1
9
9
7
8
9
2
9
8
5
9
9
9
8
8
2
9
9
9
5-Hour Field
Estimate
Max Min Avg
(pCi/m3)
0.1 0.0 0.0
0.2 0.1 0.1
0.0 0.0 0.0
0.3 0.1 0.2
0.0 0.0 0.0
0.5 0.1 0.3
0.0 0.0 0.0
0.4 0.0 0.2
0.0 0.0 0.0
0.3 0.1 0.2
0.4 0.2 0.3
0.6 0.1 0.4
0.4 0.1 0.2
0.1 0.0 0.1
1.1 0.4 0.6
0.4 0.1 0.2
0.9 0.2 0.6
0.0 0.0 0.0
0.1 0.0 0.0
0.4 0.1 0.2
0.3 0.1 0.2
NAREL Lab
Measurement
Max Min Avg
(pCi/m3)
0.01 0.00 0.01
0.01 0.00 0.01
0.01 0.01 0.01
0.01 0.00 0.01
0.02 0.01 0.01
0.01 0.00 0.01
0.00 0.00 0.00
0.01 0.01 0.01
0.01 0.01 0.01
0.02 0.01 0.01
0.01 0.00 0.01
0.02 0.01 0.02
0.02 0.01 0.01
0.01 0.00 0.01
0.02 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.01 0.01
0.01 0.00 0.00
0.01 0.00 0.01
0.01 0.00 0.01
Minimum Detectable
Minimum Detectable
Limit for. field estimates - 0.1 pCi/m .
Limit for laboratory measurement - 0.01

-------
                    Table 5
Gross Beta and Specific Gamma in Precipitation*
                   April 1993
Location
AK : Anchorage
AK: Fairbanks
AK : Juneau
AK : Juneau
AL: Montgomery
AR: Little Rock
CA: Berkeley

CO: Denver
CT: Hartford
DE: Wilmington
FL : Jacksonville
FL: Miami
ID:Boise
ID: Idaho Falls
IL : Chicago
LA: New Orleans
ME: Augusta
MI: Lansing
MN : Minneapolis
MO: Jefferson City
NC: Charlotte
NC: Wilmington
ND: Bismarck
NH: Concord

NJ:Trenton
NM: Santa Fe
NY: Albany
NY: Niagara Falls
NY:Yaphank
OH:Painesville
OH: Toledo
OR: Portland
OR: Portland
OR: Portland
OR: Port land
OR: Portland

OR: Portland
Depth
(mm)
2.4
4.0
8.0
35.0
51.0
149.0
10.4

26.0
85.0
136.0
46.4
62.4
32.0
38.2
146.8
124.0
43.0
103.4
80.0
111.0
109.0
71.0
21.6
46.6

85.8
14.0
53.6
79.0
136.0
75.4
86.0
4.8
2.6
5.0
2.0
10.0

92.2
Gross Beta
Activity
nCi/m2 ±2
-------
                      Table 5 (continued)

Gross Beta and Specific Gamma in  Precipitation*

                             April 1993
Location
OR: Port land
PArHarrisburg
SC:Barnwell

SC : Columbia
TN:Knoxville
TN: Nashville
TX: Austin
UT:Salt Lake City
VA : Lynchburg
WA:01ympia
WA:01ympia
HA : Olympia
HA:01ympia
WA: Olympia
WA: Olympia
WA : Olympia -
WA: Olympia
WI: Madison
Depth
(mm)
12.0
176.4
88.8

74.0
98.0
81.4
96.0
25.8
124.0
19.0
25.0
2.0
8.0
10.0
60.0
187.0
5.0
157.6
Gross Beta
Activity
nCi/m2 ±2(T
0.01 0.00
0.43 0.07
0.06 0.03

0.11 0.02
0.08 0.03
0.08 0.02
0.15 0.03
0.05 0.01
0.05 0.03
0.01 0.00
0.02 0.01
0.00 0.00
0.02 0.00
0.02 0.00
0.04 0.02
0.25 0.06
0.00 0.00
0.20 0.06
Specific Gamma
Activity
pCi/L ±2
-------
                   Table 6
Gross Beta and Specific Gamma in Precipitation
                   May 1993
Location
AK : Anchorage
AK : Juneau
AL: Montgomery
AR: Little Rock
AZ : Phoenix
CA: Berkeley
CO: Denver
CT: Hartford
DE: Wilmington

FL: Jacksonville
FL: Miami
HI: Honolulu
ID:Boise
ID: Idaho Falls
IL: Chic ago
LA: New Orleans
ME: August a
MI: Lansing
MN : Minneapolis
MO: Jefferson City
NC: Charlotte
NC: Wilmington
ND: Bismarck
NH: Concord
NJ:Trenton
NM: Santa Fe
NY: Albany
NY: Niagara Falls
NY:Yaphank
OH:Painesville
OH: Toledo
OR: Port land
PA:Harrisburg
SC:Barnwell
SC: Columbia
TN:Knoxville
TN: Nashville
TX: Austin
UT:Salt Lake City
Depth
(mm)
14.4
24.0
64.0
89.0
2.0
12.6
8,4
2.0
34.0

4.2
4.2
49.0
24.0
37.0
36.2
119.0
26.0
36.6
85.0
37.0
58.0
41.0
58.8
6.8
21.0
23.0
8.4-
20.0
8.0
13.4
20.0
66.8
44.0
51.8
27.2
69.0
71.0
90.0
80.2
Gross Beta
Activity
nCi/m2 ±20-
0.02 0.00
0.09 0.01
0.13 0.02
0.13 0.03
0.01 0.00
0.01 0.00
0 . 02 0 . 00
0.00 0.00
0.09 0.01

0 . 03 0 . 00
0.02 0.00
0.10 0.02
0.02 0.01
0.03 0.01
0.04 0.01
0.13 0.04
0.12 0.01
0.07 0.01
0.07 0.02
0.08 0.01
0.13 0.02
0.09 0.02
0.23 0.03
0.02 0.00
0.12 0.01
0.03 0.01
0.02 0.00
0.03 0.01
0.02 0.00
0.02 0.00
0.03 0.01
0.07 0.02
0.09 0.02
0.30 0.03
0.06 0.01
0.09 0.02
0.14 0.03
0.10 0.03
0.12 0.03
Specific Gamma
Activity
pCi/L ±2cr
ND
ND
7Be:88.6±44.8
7Be: 52.8±45.5
ND
ND
7Be: 52.3±44.0
7Be:91.8±54.6
7Be: 61.0±42.0
7Be: 51.9±39.6
ND
ND
ND
ND
ND
ND
ND
7Be: 155±47
ND
7Be:49.1±37.9
ND
ND
ND
ND
7Be: 78.1±45.7
7Be:84.0±50.1
ND
7Be: 372±65
ND
7Be:66.0±35.7
ND
ND
ND
ND
ND
ND
ND
7Be: 112±50
ND
ND
                     10

-------
               Table 6 (continued)
Gross Beta and Specific Gamma  in Precipitation
                     May 1993
Location
VA : Lynchburg
WAcOlympia
WI: Madison
Depth
(nun)
47.6
66.0
65.0
Gross Beta
Activity
nCi/m2 ±2
-------
                   Table 7
Gross Beta and Specific Gamma in Precipitation
                   June 1993
Location
AK: Fairbanks
AK : Juneau
AL: Montgomery
AR: Little Rock
CA: Berkeley
CO: Denver
CT: Hartford
DE: Wilmington
FL: Jacksonville
FL: Miami
IDrBoise
ID: Idaho Falls
IL: Chicago
LA: New Orleans
ME: August a
MI: Lansing
MN : Minneapolis
MO: Jefferson City
NC: Charlotte
NC: Wilmington
ND: Bismarck
NH: Concord
NJ: Trenton
NY: Albany
NY: Niagara Falls
NY: Syracuse
NY:Yaphank
OH:Painesville
OH: Toledo
OR: Portland
PA:Harrisburg
SC:Barnwell
SC: Columbia
TN:Knoxville
TN: Nashville
TX: Austin
TX:E1 Paso
UT:Salt Lake City
VA : Lynchburg
WA:01ympia
WI: Madison
Depth
(mm)
23.0
136.0
72.0
66.0
10.0
31.0
48.0
106.0
139.8
98.0
42.0
57.6
84.8
185.0
98.0
146.6
156.0
119.0
21.0
51.0
119.0
41.4
72.6
56.4
120.0
40.0
24.0
137.8
90.0
38.4
84.8
54.4
12.4
80.0
157.4
90.0
23.0
15.8
28.6
106.0
154.8
Gross Beta
Activity
nCi/m2 ±2
-------
        Table 8
Tritium in Precipitation
     April-June 1993
Location
AK : Anchorage
AK: Fairbanks
AK : Juneau
AL: Montgomery
AR: Little Rock
AZ: Phoenix
CA: Berkeley
CO: Denver
CT: Hartford
DE: Wilmington
FL: Jacksonville
FL: Miami
HI: Honolulu
ID:Boise
ID: Idaho Falls
IL: Chicago
LA: New Orleans
ME: August a
MI: Lansing
MN: Minneapolis
MO: Jefferson City
NC: Charlotte
NC: Wilmington
ND: Bismarck
NH: Concord
NJ: Trenton
NM: Santa Fe
NY : Albany
NY: Niagara Falls
NY : Syracuse
NY : Yaphank
OH:Painesville
OH: Toledo
OR: Portland
PA:Harrisburg
SC:Barnwell
SC : Columbia
TN:Knoxville
TN: Nashville
TX: Austin
TX:E1 Paso
April 1993
nCi/L ±2<7
0.3 0.2
NA
0.1 0.1
0.1 0.1
0.2 0.2
NS
0.1 0.1
0.3 0.2
0.2 0.2
0.1 0.1
0.1 0.1
0.2 0.1
NS
0.1 0.2
0.2 0.2
0.1 0.2
0.1 0.2
0.1 0.1
0.1 0.2
0.3 0.2
0.2 0.2
0.1 0.1
0.1 0.1
0.1 0.2
0.1 0.2
0.1 0.1
0.2 0.2
0.1 0.2
0.1 0.1
NS
0.1 0.1
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.1
0.6 0.2
0.2 0.1
0.1 0.2
0.1 0.1
0.2 0.2
NS
May 1993
nCi/L ±2
-------
             Table 8 (continued)
          Tritium in Precipitation
                April-June 1993
Location
DT:Salt Lake City
VA : Lynchburg
WA:01ympia
WI: Madison
April 1993
nCi/L ±2
-------
      Plutonium and Uranium in Airborne Particulates and Precipitation

    Environmental radiation levels of plutonium and uranium are determined by the analysis
of semiannually composited samples (air filters) collected from the  continuously operating
airborne particulate samplers.

    Concentrations of the specific isotopes of plutonium-238, -239, and -240 and uranium-
234, -235, and -238 are determined by alpha spectroscopy following chemical separation. The
volume of air represented by the semiannual composite ranges from 60,000 to 250,000 cubic
meters.

    Plutonium and uranium results are published when they become available.

    Table 9 contains the plutonium and uranium results for the period January-June 1993.
Table 10 contains the plutonium and uranium in precipitation data for January-June 1993.
Values are based upon  composites of the March, April, and May samples.  Samples from
these three months only are analyzed annually because, due to the spring rains, they usually
contain the year's highest concentrations of plutonium and uranium.
                                          15

-------
                    l^ble 9
Plutonium and Uranium In Airborne Particulates
           January-June 1993 Composites
Location
AK : Anchorage
AK: Fairbanks
AK : Juneau
AL: Montgomery
AR: Little Rock
AZ: Phoenix
CA:Berkeley
CA:Los Angeles
CO: Denver
CT: Hart ford
DE: Wilmington
FL : Jacksonville
FL: Miami
HI: Honolulu
IA:Iowa City
ID:Boise
ID: Idaho Falls
IL: Chicago
IN : Indianapolis
KS:Topeka
KY: Frankfort
LA: New Orleans
MA: Lawrence
ME: Augusta
MI: Lansing
MN : Minneapolis
MO: Jefferson City
MS: Jackson
NC: Charlotte
NC: Wilmington
ND: Bismarck
NE: Lincoln
NH: Concord
NJ: Trent on
NM: Santa Fe
NV:Las Vegas
NY: Albany
238pu
aCi/m3 ±2
-------
                        Table 9 (continued)
        Plutonium and Uranium In Airborne Particulates
                    January-June 1993 Composites
Location
NT: Niagara Falls
NY: Syracuse
NY:Yaphank
OH : Columbus
OH:Painesville
OH:Ross
OH: Toledo
OR: Portland
PA :Harrisburg
RI : Providence
SC:Barnwell
SC : Columbia
SD: Pierre
TN:Knoxville
TH: Nashville
TX: Austin
TX:E1 Paso
DT:Salt Lake City
VA : Lynchburg
VA: Virginia Beach
WA : Olympia
WA : Spokane
WI: Madison
238pu
aCi/m3 ±2
-------
                Table 10
    Plutonium and Uranium Analyses
Selected Precipitation Composite Samples
            January-June 1993
Location
AK : Anchorage
AK : Juneau
AL : Montgomery
AR: Little Rock
AZ: Phoenix
CA: Berkeley
CO: Denver
CT: Hartford
DE: Wilmington
FL : Jacksonville
FL: Miami
HI : Honolulu
ID:Boise
ID: Idaho Falls
IL : Chicago
LA: New Orleans
ME: August a
MI: Lansing
MN : Minneapolis
MO: Jefferson City
MS: Jackson
NC: Charlotte
NC: Wilmington
ND: Bismarck
NH : Concord
NJ:Trenton
NM: Santa Fe
NVrLas Vegas
NY : Albany
NY: Niagara Falls
NY : Yaphank
OH:Painesville
OH: Toledo
OR: Port land
PA:Harrisburg
SC:Barnwell
SC: Columbia
238pu
pCi/L ±2
-------
                    Table 10 (continued)
             Plutonium and Uranium Analyses
         Selected Precipitation Composite Samples
                      January-June 1993
Location
TN:Knoxville
TN: Nashville
TX: Austin
UT:Salt Lake City
VA : Lynchburg
WA : Olympia
WI: Madison
238pu
pCi/L ±2
-------
                                     Krypton-85

    Krypton-85 is a long-lived noble  gas with  a half-life of 10.8 years.  It is  released into
the atmosphere by nuclear reactor operations, fuel reprocessing, weapons tests, and research
and defense related activities. Krypton-85 also occurs naturally in minor quantities primarily
from the neutron capture of stable krypton-84  as well as spontaneous fission  and neutron-
induced fission of uranium.  Krypton-85 in the  atmosphere has been  monitored to identify
and establish baseline levels and long-term trends.

    Krypton-85 analysis began in January 1973 with sample collections and analyses being
performed for 12  sampling locations.  These locations were selected to provide atmospheric
coverage of the United States with considerations being given to the proximity  to fuel repro-
cessing plants, nuclear reactors, and wide geographic coverage.

    Dry compressed air samples, collected at each location, are purchased from commercial
air suppliers  and  shipped to the NAREL, where the krypton-85 is cryogenically separated
and counted in a  liquid scintillation system.

    The last Kr-85 results were for 1976, 1977,  and 1979. They were published in Environ-
mental Radiation Data: Report 30.
                                          20

-------
                            2.   Water Program
    The ERAMS water program provides data on ambient radiation levels in the nation's
rivers, streams, and drinking water supplies.

                                   Surface Water

    Quarterly grab samples are taken downstream from operating or future nuclear facilities
at 58 stations. Surface water samples are analyzed for tritium quarterly and specific gamma
activity annually. Tritium is a primary radioactive pollutant from nuclear power plants and
weapons production activities. Tritium concentrations are determined by liquid scintillation
counting of distilled samples.  Gamma scans are performed annually to determine levels of
gamma emitting radionuclides.

    Table 11  contains the tritium concentration data for April-June 1993.
                                          21

-------
        Table 11
Tritium in Surface Water
      April-June 1993
Location
AL:Decatur
AL:Dothan
AL:Scottsboro
AR: Little Rock
CA:Clay Station
CA: Diablo Canyon
CA : Eureka
CA:San Onofre
CO:Platteville
FL: Crystal River
FL:Ft. Pierce
FL: Home stead
IA: Cedar Rapids
ID: Buhl
IL:E. Moline
IL: Morris
IL:Zion
KS:Leroy
LA: New Orleans
MA: Plymouth
MD:Conowingo
ME:Wiscasset
MN:Monticello
MN:Red Wing
MS: Port Gibson
NC: Charlotte
NC : Southport
NE:Rulo
NJ:Bayside
NJ:Oyster Creek
NY: Chelsea
NY:Ossining
NY:Oswego
OH: Toledo
OR:Bradwood
PA: Danville
PA: Philadelphia
Source
Tennessee River
Chattahoochee River
Tennessee River
Arkansas River
Folsom S. Canal
Pacific Ocean
Humboldt Bay
Pacific Ocean
South Platte River
Gulf Of Mexico
Atlantic Ocean
Biscayne Bay
Cedar River
Snake River
Mississippi River
Illinois River
Lake Michigan
Neosho River
Mississippi River
Cape Cod Bay
Susquehanna River
Montseway Bay
Mississippi River
Mississippi River
Mississippi River
Catawba River
Atlantic Ocean
Missouri River
Delaware River
Oyster Creek
Hudson River
Hudson River
Lake Ontario
Lake Erie
Columbia River
Susquehanna River
Delaware River
Date
Collected
04/01/93
04/06/93
04/01/93
04/12/93
04/07/93
06/28/93
04/01/93
06/22/93
04/08/93
04/07/93
04/22/93
04/19/93
04/27/93
04/22/93
04/06/93
05/20/93
06/30/93
06/29/93
05/31/93
04/15/93
04/05/93
05/13/93
05/13/93
04/21/93
04/06/93
04/15/93
04/01/93
04/22/93
04/13/93
04/22/93
04/02/93
04/29/93
06/24/93
04/06/93
04/28/93
04/07/93
04/15/93
3H
nCi/L ±2ff
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.1 0.2
0.1 0.1
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.2 0.1
0.1 0.1
0.1 0.1
0.2 0.2
0.1 0.2
0.2 0.2
0.1 0.1
0.1 0.2
0.1 0.2
0.1 0.2
0.3 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.3 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.1 0.2
            22

-------
              Table 11  (continued)
           Tritium in Surface Water
                 April-June 1993
Location
PA: Philadelphia
PA: Philadelphia
SC:Allendale
SC: Broad River
SC:Hartsville
TN: Kingston
TN:Oak Ridge
TX:E1 Paso
TX:Matagorda
VArDoswell
VA: Newport News
VT:Vernon
WI: Victory
WV: Wheeling
Source
Schuylkill R.-Belmont
Schuylkill R. -Queen
Savannah River
Broad River
Lake Robinson
Clinch River
Clinch River
Rio Grande
Colorado River
North Anna River
James River
Connecticut River
Mississippi River
Ohio River
Date
Collected
04/14/93
04/14/93
04/30/93
04/23/93
04/19/93
04/28/93
05/03/93
04/02/93
04/08/93
04/07/93
04/15/93
04/09/93
04/06/93
04/01/93
3H
nCi/L ±2a-
0.1 0.2
0.2 0.2
0.8 0.2
0.1 0.2
0.1 0.2
2.0 0.2
0.1 0.2
0.1 0.2
0.2 0.2
2.4 0.2
0.2 0.2
0.1 0.2
0.2 0.2
0.1 0.2
Note: cr = Counting Error.
                        23

-------
                                  Drinking Water

    This program monitors ambient radiation levels in drinking water at 78 sites. These data
serve to assess trends and anomalies in concentrations, and to compare with standards set
forth in the EPA "National Interim Primary Drinking Water Regulations." These regulations
provide for approval of supplies when the combined radium-226 and radium-228  levels do not
exceed 5 pCi/L, when the gross alpha  (excluding radon and uranium) levels do not exceed
15 pCi/L, when tritium levels do not exceed 20,000 pCi/L, when the strontium-90 levels do
not exceed 8 pCi/L, and when the gross beta levels do not exceed 50 pCi/L.

    Grab samples are taken  at the 78 sites which are either major  population centers or
selected nuclear facility environs.

    The analyses include  (a) tritium  on  a quarterly basis;  (b) gross  alpha,  gross beta,
strontium-90, and gamma on annual composites; (c) radium-226 if the gross alpha exceeds
2 pCi/L and radium-228 if the radium-226 falls between 3 and 5 pCi/L; (d) specific iodine-
131  on  one quarterly sample per  year for each station; and (e) an annual composite for
plutonium-238, -239,  and  -240 and uranium-234, -235,  and -238 for stations that demon-
strate gross alpha levels greater than 2 pCi/L.

    Tritium analyses are performed by scintillation counting of the distilled samples.  Gross
beta and alpha are determined by evaporating an aliquot on a stainless steel  planchet for
counting.  Radium-226 is determined by the standard emanation technique.  Strontium-90 is
determined by beta counting a strontium carbonate precipitate isolated by ion  exchange.

    Table 12 contains the  data from drinking water samples for April-June  1993.
                                          24

-------
         Table 12
Tritium in Drinking Water
       April-June 1993
Location
AK: Fairbanks
AL: Do than
AL: Muscle Shoals
AL: Scott sboro
AR: Little Rock
CA: Berkeley
CA:Los Angeles
CO: Denver
CO:Platteville
DC : Washington
DE: Dover
FL: Miami
FL: Tampa
GA : Savannah
HI: Honolulu
IA: Cedar Rapids
ID: Idaho Falls
IL:W. Chicago
KS : Topeka
MA : Lawrence
MD: Baltimore
MD : Conowingo
ME: August a
MI: Grand Rapids
MN: Minneapolis
MN:Red Wing
MO: Jefferson City
MS : Jackson
MS: Port Gibson
NC: Charlotte
NC: Wilmington
ND: Bismarck
NH: Concord
NJ: Trenton
NJ:Waretown
NV:Las Vegas
NY: New York City
NY: Niagara Falls
NY: Syracuse
OH Cincinnati
OH: Columbus
Date
Collected
04/06/93
04/01/93
04/01/93
04/01/93
04/12/93
06/24/93
04/01/93
04/06/93
04/08/93
04/08/93
04/05/93
04/02/93
04/26/93
06/11/93
04/02/93
04/27/93
04/12/93
04/02/93
04/01/93
04/01/93
04/01/93
04/05/93
04/15/93
04/02/93
05/18/93
04/21/93
06/30/93
04/06/93
04/06/93
04/15/93
04/01/93
04/01/93
06/30/93
04/02/93
04/22/93
04/02/93
04/07/93
05/10/93
06/29/93
04/22/93
04/05/93
3H
nCi/L ±2ff
0.1 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.2 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.2 0.2
0.2 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.3 0.2
0.1 0.2
0.2 0.2
0.1 0.2
0.1 0.2
0.2 0.2
0.1 0.2
0.0 3.0
0.1 0.2
0.1 0.2
0.1 0.2
0.3 0.2
0.1 0.2
0.2 0.2
0.1 0.2
0.3 0.2
0.2 0.1
0.1 0.2
0.2 0.2
             25

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        Table  12 (continued)
    Tritium in Drinking Water
           April-June 1993
Location
OH: East Liverpool
OH: Toledo
OK: Oklahoma City
OR: Portland
PA: Columbia
PA:Harrisburg
PA : Philadelphia-Baxter
PA : Philadelphia-Queen
PA : Philadelphia
PA Pittsburgh
RI: Providence
SC:Barnwell
SC: Columbia
SC:Hartsville
SC : Jenkinsville
SC: Seneca
TN : Chattanooga
TX: Austin
VA:Doswell
VA : Lynchburg
VA: Virginia Beach
WI: Genoa City
WI: Madison
Date
Collected
04/27/93
04/06/93
05/19/93
04/02/93
04/08/93
04/08/93
04/14/93
04/15/93
04/15/93
04/27/93
06/30/93
04/06/93
04/06/93
04/19/93
04/16/93
04/20/93
04/19/93
04/07/93
04/07/93
04/02/93
04/06/93
04/06/93
04/08/93
3H
nCi/L ±2
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   3.   External Gamma Ambient  Monitoring  Program
    The External Gamma Monitoring Program (EGAMP), which began in October 1978,
provides a continuous measurement of ambient gamma exposure rates, including cosmic, at
selected sites throughout the continental United States. Data from this program are used
to evaluate fluctuations in natural background due to variations in environmental condi-
tions  and to  provide a  means of monitoring any significant increases in ambient gamma
levels. The program consists of approximately 22 sites representing wide geographic cover-
age throughout the country, f  Although exposure measurements  at these few sites are not
totally representative of nationwide exposures, they do indicate national trends.

    The EGAMP program utilizes CaF2:Mn thermoluminescent dosimeters (TLD's). These
dosimeters are commercially available glass-bulb type dosimeters with energy compensating
shields. A group of three TLD's is located at each station or site. Dosimeters are annealed
by the station operator prior  to positioning in the field.  The dosimeters  are returned to
NAREL for readout approximately every three months. Several dosimeters  are annealed by
the station operator as  controls and  returned with the exposed field dosimeters to correct
for any exposures accumulated during shipment.

    Publication of EGAMP  data has been suspended until problems with  the data are re-
solved.
  t Since some of these sites may not return dosimeters each period, the number of sites listed may vary slightly.

                                         27

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                             4.   Milk Program
                                 Pasteurized Milk

    This is a cooperative program with the Dairy and Lipid Products Branch, Milk Sani-
tation Section, Food and Drug Administration.  Milk is a reliable indicator of the general
population's intake of radionuclides since it is consumed fresh by a large segment of the pop-
ulation  and can contain several of the biologically important radionuclides that result from
environmental releases from nuclear activities.  A primary function of this program is to ob-
tain reliable monitoring data relative to current radionuclide concentrations and determine
any long-term trends.

    Monthly  samples are collected at 65 sampling sites with at least one  located in each
state, Puerto Rico, and the Panama Canal  Zone. The samples are composited, according
to production, from the major milk suppliers representing more than 80 percent of the milk
consumed in  a given population center.

    The samples are analyzed for gamma emitting nuclides, including iodine-131, barium-
140, cesium-137, and potassium. All samples collected in July are analyzed for strontium-90.
Also, for the first  month of the three quarters beginning January, April, and October, 10
regional composite samples of milk made up from the states within each of EPA's 10 regions
are analyzed  for strontium-90.

    Iodine-131, barium-140, cesium-137, and potassium are determined by gamma spectral
analysis. Strontium-90 is determined by beta counting a total strontium precipitate that has
been chemically separated by ion  exchange.

    Tables 13-15 contain the concentrations of radionuclides in pasteurized milk for April-
June 1993. Table  16 contains the concentrations of strontium-90 in pasteurized milk EPA
Regional Composites for April 1993.
                                          28

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            Table 13
Radionuclides in Pasteurized Milk
            April 1993
Location
AL: Montgomery
AR: Little Rock
AZ : Phoenix
CA:Los Angeles
CA: Sacramento
CArSan Francisco
CO: Denver
DE: Wilmington
FL : Tampa
GA: Atlanta
HI : Honolulu
IA:Des Moines
IL: Chicago
IN : Indianapolis
KS: Wichita
KY: Louisville
LA: New Orleans
MA: Boston
MD: Baltimore
ME: Port land
MI:Detroit
MI : Grand Rapids
MN:St. Paul
MO: Kansas City
MS: Jackson
MT: Helena
NC: Charlotte
ND:Minot
NJ: Trenton
NM : Albuquerque
NV:Las Vegas
NY: Buffalo
NY: Syracuse
OH: Cincinnati
OH: Cleveland
OR: Portland
PA : Philadelphia
Date
Collected
04/08/93
04/06/93
04/14/93
04/14/93
04/05/93
04/06/93
04/02/93
04/21/93
04/05/93
04/27/93
04/26/93
04/12/93
04/01/93
04/05/93
04/29/93
04/06/93
04/27/93
04/09/93
04/02/93
04/07/93
04/08/93
. 04/05/93
04/07/93
04/14/93
04/06/93
04/12/93
04/29/93
04/27/93
04/07/93
04/13/93
04/13/93
04/19/93
04/05/93
04/28/93
04/15/93
04/05/93
04/05/93
K
g/L ±2(7
1.63 0.06
1.56 0.06
1.60 0.06
1.61 0.06
1.61 0.07
1.68 0.07
1.42 0.08
1.61 0.08
1.63 0.05
1.49 0.06
1.63 0.07
1.64 0.07
1.51 0.11
1.60 0.06
1.57 0.14
1.53 0.06
1.63 0.07
1.55 0.06
1.58 0.11
1.66 0.06
1.63 0.07
1.70 0.07
1.67 0.07
1.58 0.07
1.51 0.06
1.60 0.08
1.38 0.13
1.66 0.07
1.58 0.08
1.61 0.06
1.67 0.07
1.67 0.08
1.51 0.07
1.62 0.06
1.63 0.06
1.68 0.07
1.62 0.06
137Cs
pCi/L ±2(7
ND
ND
ND
ND
ND
ND
ND
ND
7 1
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
140Ba
pCi/L ±2cr
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
131 j
pCi/L ±2<7
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
                29

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                   Table 13 (continued)
           Radionuclides in Pasteurized Milk
                         April 1993
Location
PA: Pittsburgh
PC: Cristobal
PR: San Juan
SC: Charleston
SD: Rapid City
TN: Chattanooga
TN:Knoxville
TN: Memphis
TX: Austin
TX:Ft. Worth
VA: Norfolk
VT: Burlington
WA: Seattle
WA : Spokane
WV: Charles ton
Date
Collected
04/05/93
04/02/93
04/08/93
04/21/93
04/05/93
04/12/93
04/05/93
04/19/93
04/28/93
04/08/93
04/01/93
04/13/93
04/01/93
04/06/93
04/20/93
K
g/L ±2
-------
            Table 14
Radionuclides in Pasteurized Milk
             May 1993
Location
AL: Montgomery
AR: Little Rock
AZ: Phoenix
CA:Los Angeles
C A : Sacramento
CO: Denver
CT: Hartford
DE: Wilmington
FL : Tampa
GA: Atlanta
HI: Honolulu
IA:Des Moines
IL : Chicago
IN : Indianapolis
KS: Wichita
KY: Louisville
MA:Boston
MA: Lawrence
MD: Baltimore
MI:Detroit
MI: Grand Rapids
MN:St. Paul
MO: Kansas City
MO: St. Louis
MS: Jackson
MT : Helena
NC: Charlotte
ND:Minot
NJ: Trenton
NM : Albuquerque
NV:Las Vegas
NY: Buffalo
NY: Syracuse
OH: Cincinnati
OH: Cleveland
OR: Portland
PA : Philadelphia
Date
Collected
05/07/93
05/10/93
05/27/93
05/20/93
05/03/93
05/10/93
05/03/93
05/18/93
05/03/93
05/11/93
05/18/93
05/12/93
05/06/93
05/03/93
05/26/93
05/04/93
05/20/93
05/18/93
05/14/93
05/07/93
05/05/93
05/05/93
05/10/93
05/04/93
05/05/93
05/10/93
05/27/93
05/26/93
05/04/93
05/07/93
05/03/93
05/05/93
05/05/93
05/26/93
05/19/93
05/04/93
05/05/93
K
g/L ±2
-------
                   Table 14 (continued)
           Radionuclides in Pasteurized Milk
                         May 1993
Location
PA: Pittsburgh
PC: Cristobal
PR: San Juan
SD: Rapid City
TN:Knoxville
TX:Ft. Worth
VA: Norfolk
VT: Burlington
WA: Seattle
WA : Spokane
WV: Charles ton
Date
Collected
05/03/93
05/13/93
05/07/93
05/03/93
05/03/93
05/11/93
05/27/93
05/14/93
05/11/93
05/04/93
05/18/93
K
g/L ±2
-------
            Table 15
Radionuclides in Pasteurized Milk
            June 1993
Location
AL : Montgomery
AR: Little Rock
AZ: Phoenix
CA:Los Angeles
CA: Sacramento
CO: Denver
CT: Hartford
DE : Wilmington
FL : Tampa
GA: Atlanta
HI: Honolulu
IA:Des Moines
IL: Chicago
IN : Indianapolis
KS: Wichita
KY: Louisville
LA: New Orleans
MA: Boston
MD: Baltimore
ME: Portland
MI: Grand Rapids
MN:St. Paul
MO: Kansas City
MO: St. Louis
MS: Jackson
MT: Helena
NC: Charlotte
ND:Minot
NJ:Trenton
NM : Albuquerque
NV:Las Vegas
NY: Buffalo
NY: Syracuse
OH: Cincinnati
OH Cleveland
OR: Portland
PA Philadelphia
Date
Collected
06/11/93
06/15/93
06/22/93
06/02/93
06/01/93
06/22/93
06/07/93
06/23/93
06/01/93
06/07/93
06/24/93
06/14/93
06/04/93
06/07/93
06/16/93
06/07/93
06/24/93
06/07/93
06/04/93
06/01/93
06/07/93
06/02/93
06/24/93
06/03/93
06/07/93
06/28/93
06/23/93
06/28/93
06/09/93
06/21/93
06/15/93
06/09/93
06/01/93
06/30/93
06/15/93
06/01/93
06/07/93
K
g/L ±2
-------
                   Table 15 (continued)
           Radionuclides in  Pasteurized Milk
                         June 1993
Location
PA: Pittsburgh
PC: Cristobal
PR: San Juan
SC: Chariest on
SD: Rapid City
TN: Chattanooga
TN:Knoxville
TX: Austin
TX:Ft. Worth
VT: Burlington
WA: Seattle
WA : Spokane
WV: Charles ton
Date
Collected
06/08/93
06/02/93
06/11/93
06/16/93
06/02/93
06/23/93
06/09/93
06/07/93
06/14/93
06/16/93
06/02/93
06/07/93
06/23/93
K
g/L ±2
-------
            Table 16

Strontium-90 in Pasteurized Milk
   EPA Regional Composites

            April 1993
EPA
Region
I
II
III
IV
V
VI
VII
VIII
IX
X
Collection
Date
04/10/93
04/10/93
04/14/93
04/13/93
04/10/93
04/16/93
04/18/93
04/12/93
04/13/93
04/04/93
90Sr
pCi/L ±2o-
1.4 0.5
1.6 0.1
1.0 0.4
1.5 0.3
1.4 0.4
1.7 0.4
1.4 0.4
1.3 0.4
0.4 0.7
0.6 0.4
     Note: ff = Counting Error.
                35

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                                Carbon-14 in Milk

    Nine stations,  chosen for wide geographical distribution,  contribute milk samples for
annual analysis of carbon-14. These samples are monitored for carbon-14 levels in the food
chain resulting from nuclear testing.  The pasteurized milk is freeze-dried and the resulting
powder is pelletized for ease of combustion. Analysis consists of combusting the samples and
converting the released carbon dioxide through a series of chemical conversions to benzene,
which is then assayed for carbon-14 by liquid scintillation.

    The samples undergo three main steps in the chemical conversions to benzene prior to
liquid scintillation  counting. They include (1) combustion of the sample to  carbon dioxide,
(2) conversion of the carbon dioxide to acetylene, and (3) trimerizations of the acetylene
to benzene.  The last carbon-14 results were for  samples  collected during April-May 1982,
1983-1986, and March-May 1987. They were published in Environmental Radiation Data:
Report 54 and Environmental Radiation Data: Report 59.
                                         36

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    Environmental Radiation Data (ERD) is published quarterly (January, April, July, October)  by the
U.S. Environmental Protection Agency's Office of Radiation and Indoor Air.

    Requests for information concerning publication and distribution of ERD should be directed to:

                                         Charles M. Petko
                                        Office of the  Director
                        National Air and Radiation Environmental Laboratory
                                      540 South Morris Avenue
                                 Montgomery, Alabama 36115-2601

    Requests for information concerning the operation of ERAMS should be directed to:

                                        John G. Griggs,  Chief
                              Monitoring and Analytical Services Branch
                        National Air and Radiation Environmental Laboratory
                                      540 South Morris Avenue
                                 Montgomery, Alabama 36115-2601
                                               or to:
                                         William C. Conklin
                               Policy and Emergency Response Branch
                               Criteria and Standards Division (6602J)
                                       USEPA Waterside Mall
                                         401 M Street, S.W.
                                       Washington, DC 20460

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