FINAL REPORT OF OFF-SITE SURVEILLANCE
FOR THE
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by the
South-western Radiological Health Laboratory
U. S. Public Health Service
Department of Health, Education, and Welfare
Las Vegas, Nevada
February 3, 1965
This surveillance performed under a Memorandum of
Understanding (No. SF 54 373)
for the
U. S. ATOMIC ENERGY COMMISSION
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LEGAL NOTICE
This report was prepared as an account of Government-sponsored work.
Neither the United States, nor the Atomic Energy Commission, nor any
person acting on behalf of the Commission:
A. Makes any warranty or representation, expressed or implied, with
respect to the accuracy, completeness, or usefulness of the information
contained in this report, or that the use of any information, apparatus,
method, or process disclosed in this report may not infringe privately
owned rights; or
B. Assumes any liabilities with respect to the use of, or for damages
resulting from the use of any information, apparatus, method, or pro-
cess disclosed in this report.
As used in the above, "person acting on behalf of the Commission"
includes any employee or contractor of the Commission, or employee
of such contractor, to the extent that such employee or contractor of
the Commission, or employee of such contractor prepares, dissemin-
ates, or provides access to, any information pursuant to his employ-
ment or contract with the Commission, or his employment with such
contractor.
01
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SWRHL-l6r
FINAL, REPORT OF OFF-SITE SURVEILLANCE
FOR THE
NRX-A2 EXPERIMENT
by the
Southwestern Radiological Health Laboratory
U. S. Public Health Service
Department of Health, Education, and Welfare
Las Vegas, Nevada
Copy No. 1
0. R. Placak
SWRHL
Las Vegas, Nevada
February 3, 1965
This surveillance performed under a Memorandum of
Understanding (No. SF 54 373)
for the
U. S. ATOMIC ENERGY COMMISSION
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ABSTRACT
The Public Health Service provided off-site surveillance in support of
the NRX-A2 reactor tests conducted on September 24 and October 15,
1964. This support consisted of tracking the effluent, monitoring
radiation dosage to the off-site population, and collecting environ-
mental samples (air, milk, water and vegetation). Analyses of these
data indicate that no hazard •was created to the off-site population
from the NRX-A2 tests.
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TABLE OF CONTENTS
ABSTRACT i
TABLE OF CONTENTS ii
LIST OF FIGURES iii
LIST OF TABLES iii
INTRODUCTION 1
Section 1. NRX-A2 EPIV, September 24, 1964
I. , OPERATIONAL PROCEDURES 2
A. External Measurements 2
B. Environmental Measurements 4
II. RESULTS 9
A. Ground Monitoring Data 9
B. Dose Rate Recorder Data 10
C. Film Badge Data 10
D. Air Sample Data 11
E. Milk Sample Data 12
F. Water Sample Data 12
III. CONCLUSIONS 14
Section 2. NRX-A2 EPV, October 15, 1964
I. OPERATIONAL PROCEDURES 15
II. RESULTS
A. Ground Monitoring Data 16
B. Dose Rate Recorder Data 16
C. Film Badge Data 16
D. Air Sample Data 16
E. Milk Sample Data 17
F. Water Sample Data 17
G. Vegetation Sample Data 19
III. CONCLUSIONS 20
ii
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LIST OF FIGURES
Figure 1. Location of air samplers and dose rate recorders for
NRX-A2 EPIV. 3
Figure 2. Location of air samplers and dose rate recorders for
NRX-A2 EPV. 5
Figure 3. Environmental sampling locations for EPIV and EPV. 18
LIST OF TABLES
Table 1. Dose rate measurements off the test range complex on
September 24, 1964. 9
Table 2. Meteorological Data for EPIV. 10
Table 3. Analysis of air samples collected following the NRX-A2
EPIV Experiment. 11
Table 4. Analyses of milk and vegetation samples collected
following NRX-A2 EPIV. 13
TableS. Meteorological Data for EPV. 17
111
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INTRODUCTION
As' a part of the ROVER Program, testing and disassembling of a
series of reactors designated NRX-A is being carried on under the
Nuclear Engine for Rocket Vehicle Application (NERVA) Project at
the Nuclear Rocket Development Station. The subject of this report
is the off-site surveillance provided by the Public Health Service(PHS)
for the Atomic Energy Commission (AEC) in support of the NRX-A2
experiments conducted at Test Cell A onSeptember 24 and October 15,
1964. Each test will be covered in a separate section of this report.
Under a Memorandum of Understanding with the Atomic Energy
Commission, the U. S. Public Health Service conducts a program
of radiological monitoring and environmental sampling in the off-site
area surrounding the Nevada Test Site and the Nellis Air Force
Range. The overall complex of the Nevada Test Site (NTS) and the
Nellis Air Force Range (NAFR) includes the Nuclear Rocket Devel-
opment Station (NRDS) and the Tonopah Test Range (TTR) and for
simplicity will be called the test range complex throughout this
report.
Since Public Health Service monitors must begin tracking and moni-
toring an effluent cloud close to its point of origin, measurements
are also made within the test range complex, but are used only as a
guide to trajectory determination or for purposes of checking instru-
mentation and methodology. They did not serve as parameters in
determining dose to people or contamination of property in the
off-site area during the NRX-A2 tests and are not a subject of this
report.
1
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Section 1. NRX-A2 EPIV, September 24, 1964
I. OPERATIONAL PROCEDURES
On September 24, the reactor was tested under the conditions known
as Experimental Plan IV (EPIV) and was operated at design power
from 1055 to 1105 PDT. The reactor was tested in an upright posi-
tion so that the hydrogen coolant exhausted upward along with escap-
ing fission products.
A. External Measurements
Ground Monitoring
Thirteen ground monitors tracked the reactor effluent passage
with portable instruments. Each monitor was equipped with an
Eberline E-500B, a Precision Model 111 Standard "Scintillator",
and a Victoreen Radector Model No. AGB-50B-SR.
The Eberline E-500B has a range of 0 to 200 milliroentgens
per hour (mr/hr) gamma and beta-gamma detection in four scales
with an external halogen filled GM tube and a 0 to 2000 mr/hr
range from an internal Anton 302 tube. The Precision Model 111
"Scintillator" is used primarily for low level detection and pro-
vides for a range of 0 to 5 mr/hr in six scales. The Radector
has a range of 0 to 50, 000 mr/hr on two scales. This instrument
employs an air ionization chamber. These instruments are
accurate to +_ 20%, and readings can be taken to two significant
figures.
Remote Dose Rate Recorders
Eberline RM-11 dose rate recorders were placed at sixteen sta-
tions around the test range complex. These recorders utilize a
Geiger tube detector to document radiation levels at specific lo-
cations. The instrument has a 0. 01 to 100 mr/hr range and the
2
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Figure 1. Location of air samplers and dose rate recorders for NRX-A2 EPIV.
3
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gamma dose rate is recorded on a 30-hour strip chart. The
RM-11 is accurate to +_ 20% as calibrated with a Co source.
The locations of dose rate recorders are presented in Figure 1.
Aerial Cloud Tracking
An Air Force U-3A aircraft, manned by two Public Health Service
monitors equipped with portable instruments identical to those of
the ground monitors, tracked the reactor effluent to position
ground monitors. Two Public Health Service C-45 aircraft con-
taining sampling equipment were also used as aids in cloud
tracking. However, their primary purpose was cloud sampling
in order to determine cloud size and inventory. The results of
their sampling are reported separately.
Film Badges
The PHS maintains 65 film badge stations off the test range com-
plex and assigns badges to 166 off-site residents. The badge
used is made up of Dupont Type 555 film. This film is accurate
to +_50% in the 20 to lOOmr range and +_10% in the 100 to 2000 mr
range.
B. Environmental Measurements
Air Samples
On the test day the PHS maintained General Metal Works high
volume air samplers containing glass fiber prefilters at 36
off-site locations as shown in Figures 1 and 2. Thirteen of the
air samplers were equipped with MSA* charcoal cartridges in
addition to the prefilters. All air sample prefilters collected
following the NRX reactor runs were returned to the Southwestern
Radiological Health Laboratory (SWRHL) in Las Vegas to be
counted for gross beta activity with a thin window, large area
*Mine Safety Appliance Company
4
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Figure 2. Location of air samplers and dose rate recorders for NRX-A2 EPV.
5
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proportional probe connected to a high speed sealer. The sys-
tem has an efficiency of approximately 30% for 1. 5 Mev betas
and has a background of 575 +_ 20 counts per minute.
Gross beta concentrations were computed at the time of count
for the purpose of screening samples and delineating the effluent
trajectory. These samples were then stored for five days to
allow natural activity to decay. They were recounted at this
time and again seven days later. Activity levels were then re-
computed to end of collection from these two later counts. Sev-
eral air samples exhibiting levels of activity significantly above
natural background were recounted frequently to obtain a decay
curve. The curve obtained was then analyzed for best fit to the
general equation y=ax . Based on an analysis of decay curves,
a T ' relationship was found to exist with a mean error of
_+ 5%. This relationship was then used to extrapolate the activity
to the end of the collection period.
All charcoal cartridges were analyzed for gamma isotopes by
placing each cartridge directly on a 4" x 4" sodium iodide crys-
tal coupled to a 400-channel pulse height analyzer set to view
energies from 0 to 2 Mev. Assuming no break in the prefilter,
the activity on the cartridge should represent the gaseous fission
products such as isotopes of iodine. Overall detection efficiency
for this geometry is about 18% at 0. 53 Mev (I ). The mini-
mum detectable activity for I ,1 ,1 , and I is taken
131
to be 200 picocuries with an associated error of + 50% for I ,
I ,1 , and +_ 100% for I . The time of count is 10 minutes.
Error estimates are such that values less than 1 picocurie per
cubic meter (pc/M ) are generally not reported. Since it is not
possible to define duration of effluent passage at all locations.
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the reported values given as pc/M assume an average concen-
tration over each entire sampling period.
Milk and Water Samples
After each release of activity from NRDS, milk samples are
collected from dairies (processing plants), producing dairy
farms, and farms producing milk for their own consumption.
Milk samples were collected, relative to this event, from the
locations shown in Figure 2. Each sample w a s counted for
50 minutes. No attempt was made to recount samples giving
low positive values. The lower limit of detection for gamma
emitters in milk samples is taken to be 20 picocuries per
liter (pc/1) at the time of count, and all results below that value
are reported as <20 pc/1. The error associated with reported
values is _+ 20 pc/1. All reported values are extrapolated to
collection time.
All liquid samples are counted in 3. 5 liter inverted well alumi-
num beakers which are placed on top of a 4" x4" crystal coupled
to a 400-channel gamma pulse height analyzer. Overall detec-
tion efficiency for the 0. 364 Mev photo-peak of I is 6.4%. A
matrix technique is employed in computation to compensate for
the interference due to the presence of other isotopes. The in-
put to this matrix i s variable, allowing for the simultaneous
determination of any eight nuclides for which detection efficien-
cies and interference factors have been obtained. Actual com-
putation is performed by an IBM 1620 computer.
Vegetation Samples
Vegetation samples were obtained at most milk sampling loca-
tions. An attempt was made to make the samples representative
of the cow's feed; however, the samples were taken primarily
7
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as early indicators of where milk might be contaminated and
were not intended to yield a cow intake-excretion formula. For
this reason the vegetation samples are reported simply as fresh
fission products present or not present.
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II RESULTS
Experimental Plan IV re suited in low levels of radioactivity being de-
tected off the test range complex. Radiation monitors were posi-
tioned in an area southwest of the test area according to information
furnished by aerial monitors and the U. S. Weather Bureau. (See
Table 2).
A. Ground Monitor Data
Gamma dose rates above background were detected in the vicin-
ity of Lathrop Wells, on Highway 95, and at Dansby's Ranch
located 10 miles southwest of Lathrop Wells. (See Table 1 below).
Lathrop Wells has a population of about fifty people. Monitoring
at these places on the day following the test produced only back-
ground readings. Monitors were also called upon to check the
off-site area during the night following the test when activity was
detected on the NRDS. Readings above background were found
off the test range complex for five miles along Highway 95
starting nine miles northwest of Lathrop Wells. The maximum
reading of 0. 12 mr/hr was found 9. 8 miles NW of Lathrop Wells
at approximately 0100 hours on September 25.
Table 1. Dose rates occurring off the test range complex on
September 24, 1964.
Location
(See Fig. 1)
Lathrop Wells
Dansby's Ranch
Hwy 95(4.5 mi NW
of Lathrop Wells)
Time of Peak
Dose Rate
(PDT)
1234
1320
1220
Time of dose rates
greater than
background
1215-1500
1250-1450
1240-1330
Net Peak
Dose Rate
(mr/hr)
0.43
0. 07
0. 23
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Table 2. Meteorological Data for EPIV
Upper Air Data: Jackass Flats, Nevada, 1100PDT, September 24, 1964
Height
Wind
Pressure Temperature Dew Point Relative
(Ft. MSL)
SFC
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
(Deg/Kts)
070/18
060/22
060/13
080/11
040/04
030/04
090/08
090/08
098/11
080/12
073/18
070/19
(mb)
895
883
854
824
794
768
738
712
687
662
638
614
,o .
28. 6
25. 0
22. 7
20. 0
17. 3
15. 3
12.9
10. 7
8. 0
5. 5
3.6
1. 7
<°C)
0.6
- 3.4
- 2. 7
- 3.6
- 4. 0
- 4. 2
- 4.6
- 5.6
- 7.6
- 9. 1
-12. 6
-18.8
Humidit-
15
15
18
20
23
26
29
31
32
34
29
20
B. Dose Rate Recorder Data
The recorder at Lathrop Wells indicated radioactivity associ-
ated with effluent from the NRX-A2 test on September 24. This
instrument recorded a net peak dose rate of 0.18 mr/hr at
1230 hours PDT. The time interval in which the dose rate ex-
ceeded background was 1210 to 1340 hours and the estimated
external dose during cloud passage was 0. 08 mr.
C. Film Badge Data
Due to the low dose rates encountered at points south and west
of the test range complex, no off-site film badges were collected
immediately following the NRX-A2 test. Badges collected since
that time, however; have had no exposure which could be attri-
buted to the EPIV test.
10
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D. Air Sample Data
Several samples taken following the test contained fresh fission
products. The results of analysis of the prefilters and charcoal
cartridges are presented in Table 3.
Table 3. Analysis of air samples containing fresh fission products
collected following the NRX-A2 EPIV Experiment reported
in c/M-^ at end of collection.
ON OFF Vol- Prefilter
Location Time-Date Time-Date ume Gross
PDT PDT (M3) Beta
Activity
Gamma Pulse
Height Analysis
jlSl 133 135
Lathrop 0715, 9-24 1455, 9-24 261 450
Wells
1500,9-24 0715,9-25 553 2.3
Dansby 1050, 9-24 1550, 9-24 183 420
Ranch
Death 0940,9-24 1500,9-24 211 2.5
Valley Jet.
1500,9-24 0625,9-25 642 2.2
Stovepipe 1045, 9-24 1500, 9-24 181 <1
Wells
1510,9-24 1030,9-25 804 1.5
Furnace 1100,9-24 1500,9-24 146 3.6
Creek
1510, 9-24 0955, 9-25 750 19
P
C
P
C
P
C
13
<1
ND
12
57
42
55
45
84
37
ND
82
ND
C ND ND ND
P
C ND <1 ND
P
C ND ND ND
P 0.5 2.4 3.5
C <1 4. 9 ND
P
C ND ND ND
P 0.5 2.4 3.5
C <1 3. 9 ND
P=prefilter C = charcoal cartridge ND=not detectable
Air samples taken on September 24 atScotty's Castle, Beatty
and Springdale showed no fresh fission products when analyzed.
11
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E. Milk Sample Data
Milk samples obtained on the test day and the two following days
133
at Dansby's Ranch indicated low levels of I . Iodine-131 was
not present in detectable quantities. Dansby's Ranch is 22 miles
southwest of Test Cell A. Six other milk samples collected did
not contain fresh fission products in detectable quantities.
(See Table 4). The cesium values reported are within the range
of the cesium levels generally found in the particular areas
sampled.
F. Water Sample Data
Water samples collected on the day of the test at Dansby's Ranch
and the day after the test at the Watson and Selbach Ranches
near L/athrop Wells, Lathrop Wells Gas Station, Furnace Creek
and Stovepipe Wells did not show detectable levels of radio-
activity.
12
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Table 4. Analyses of milk and vegetation samples collected following NRX-A2 EPIV
COLLECTION DATA
LOCATION
(Azimuth and Distance
from Test Cel 1 A)
Dansby Ranch
Lathrop Wei 1 s
225° 22 mi .
Hunter's Ranch
Olancha, California
248° 100 mi.
Lone Pine Dai ry
Lone Pine, California
261° 98 mi.
M&R Cattle Company
Canti 1 , Cal i forni a
221° 140 mi .
Hills Dai ry
Barstow, California
200° 140 mi .
DATE
COLrf&TED
9-24
9-25
9-26
9-27
9-26
9-26
9-27
9-27
Milk Radioassay Data
ACTIVITY (pc/l)
,13. ,133 Cs137
<20 200 20
<20 70 30
<20 20 20
<20 <20 25
<20 <20 65
<20 <20 40
<20 <20 40
<20 <20 20
Vegetat ion
Samples
Taken
P
P
P
— — —
ND
ND
ND
ND
OJ
ND=fresh fission products not present in vegetation.
P=presence of fresh fission products in vegetation samples.
=vegetation samples not taken.
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Ill CONCLUSIONS
The NRX-A2 test of September 24, 1964, yielded low levels of radio-
activity to the off-site area. The effluent was encountered in a small
area of the Armagosa Desert between Death Valley Junction, Stove-
pipe Wells, and the NRDS. Fresh fission products were detected as
far away as Stovepipe Wells (45 miles) and Furnace Creek (40 miles)
in the form of radioiodines on air filters. In both cases the concen-
trations were less than five picocuries per cubic meter of air. The
maximum levels of radioactivity detected off the test range complex
were found at Lathrop Wells, Nevada. These levels of 0.43 mr/hr
net gamma and 450 pc/M3 of gross beta activity were not considered
health hazards to the population.
Environmental samples collected following the test did not show de-
tectable amounts of radioactivity more than thirty miles from NRDS.
Only one milk cow was in the effluent path -within 80 miles of the test
area. This cow was located at Dansby's Ranch which is 22 miles
south-west of Test Cell A and eight miles south-west of Lathrop Wells,
Nevada. Although the milk from this cow was not used for human
consumption at the time of the test, samples were taken for several
days following NRX-A2 EPIV. This milk contained no I in detect-
able quantities and the peak I concentration was 200 pc/1 -which
occurred on the day of the test. Since this milk sample -was collected
only two to three hours after cloud
milk -was evidently due to inhalation.
only two to three hours after cloud passage, the I found in the
14
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Section 2. NRX-A2 EPV, October 15, 1964
I. OPERATIONAL PROCEDURES
The reactor was tested under the conditions known as Experimental
Plan V (EPV) on October 15, 1964 at 1210 hours PDT. The test was
approximately a twenty minute run at less than 20 per cent of design
power. The reactor was in an upright position so that the fission
products exhausted upward.
The operational procedures followed on this experiment were simi-
lar to those used in support of the September 24 test.
15
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II. RESULTS
On October 15, 1964 Experimental Plan V was conducted with low
levels of radioactivity being detected northeast of the test range com-
plex. A summary of weather conditions at 1230 on the test day is
presented in Table 5.
A. Ground Monitor Data
Due to the low dose rates encountered by aerial monitors, no
ground monitors were positioned off the test range complex.
However, ground monitors located on the test range complex
downwind from the reactor encountered no readings above back-
ground.
B. Dose Rate Recorder Data
RM-11 recorder charts collected following NRX-A2 EPV indi-
cated no dose rates above background.
C. Film Badge Data
Due to the low dose rates encountered, no film badges •were col-
lected immediately following the NRX-A2 test. Badges collected
since that time, however; have had no exposures which could be
attributed to the EPV test.
D. Air Sample Data
Only one off-site air sample contained detectable quantities of
fresh fission products. The charcoal cartridge at Indian Springs
showed 150 total picocuries of I . This sample was started at
1800 on the test day and the air sampler motor failed during the
night. However; if the sampler ran for only two hours, 150 total
picocuries would b e less than one picocurie per cubic meter
16
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on the filter. Although the effluent from EPV went to the north-
east, it is believed that northerly drainage winds carried some
radioactivity to the south during the night resulting in radioiodine
being detected at Indian Springs.
Table 5. Meteorological data for EPV.
Upper air data at: Jackass Flats, Nevada, 1230 PDT, October 15, 1964
Height Wind Pressure Temperature Dew Point Relative
(Ft. MSL) (Deg/Kts) (mb) ( C) (°C) Humidity
SFC
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
Calm
250/02
220/02
180/02
140/01
180/02
180/04
170/05
180/08
180/12
170/16
180/16
892
880
850
821
791
752
735
711
686
659
634
611
28. 3
26. 8
23. 3
20.4
17. 5
14.6
12. 1
9. 1
6.4
3. 2
0. 8
- 1.9
- 1.8
- 2.0
- 2.4
- 3.4
- 4. 0
- 4. 8
- 5. 0
- 6. 0
- 6. 3
-7.3
- 6.3
-11. 0
14
15
18
20
23
26
30
34
40
46
51
50
E. Milk Sample Data
Milk samples were collected at Lund, Nevada on October 16 and
at Alamo and Hiko on October 20. These samples did not contain
detectable quantities of fresh fission products.
F. Water Sample Data
A water sample collected from a water trough at Goss Ranch on
October 16
the sample.
October 16 contained 75 pc/1 of I . No I was detectable in
17
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r V3C4 _. \c If !
\r^.^ \MfAO If
Figure 3. Environmental sampling locations for EPIV and EPV.
18
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G. Vegetation Sample Data
In order to determine cloud trajectory, vegetation samples were
collected at Goss Ranch, Hiko and Alamo, Nevada. The samples
from Goss Ranch and Hiko contained low levels of fresh fission
products.
19
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III. CONCLUSIONS
The NRX-A2 EPV experiment of October 15, 1964, yielded low
levels of radioactivity off the test range complex. The effluent
was found in an area northeast of the test range complex between
Test Cell A and Hiko, Nevada.
Low levels of fresh fission products -were found on vegetation sam-
ples collected at Goss Ranch and Hiko and in a water sample from
Goss Ranch but no radioactivity was found in milk sampled at Hiko,
Lund and Alamo. It is concluded that the radioactivity from this
test did not constitute a hazard to the off-site population.
20
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DISTRIBUTION
1-15 SWRHL, Las Vegas, Nevada
16 G. D. Ferber, USWB, MRPB (R-3. 3), Washington, D. C.
17 Phillip W. Allen, USWB, NVOO, Las Vegas, Nevada
18 Harold Mueller, USWB, NVOO, Las Vegas, Nevada
19-20 Col. E. G. Halligan, DASA, NVOO, Las Vegas, Nevada
21 C. S. Maupin, REECo, Mercury, Nevada
22 V. M. Milligan, REECo, Mercury, Nevada
23 Vincent Vespe, ALOO, Albuquerque, New Mexico
24-26 George T. Anton, SNPO-N, Jackass Flats, Nevada
27 B. P. Helgeson, SNPO-N, NRDS, Jackass Flats, Nevada
28 John C. Gallimore, WANL, NRDS, Jackass Flats, Nevada
29 Morton I. Goldman, NUS, Washington, D. C.
30 Elmer Hemmerle, Westinghouse Electric Corp. , Pittsburgh, Pa.
31 David Smith, Lewis Research Center, SNPO-C, Cleveland, Ohio
32 John M. Wright, SNPO-N, Jackass Flats, Nevada
33 Hugo G. Simens, NERVA Test Opns. , Aerojet-Gen. Corp. ,
Jackass Flats, Nevada
34 Bernd Kahn, DRH, RATSEC, Cincinnati, Ohio
35 Raymond Moore, DRH, PHS, Region VII, Dallas, Texas
36 James G. Terrill Jr. , DRH, PHS, Washington, D. C.
37-39 Robert H. Goeckermann, LRL, Livermore, California
40 John W. Gofman, LRL, Livermore, California
41 Keith Boyer, LASL, Los Alamos, New Mexico
42 Charles I. Browne, LASL, Los Alamos, New Mexico
43 Alvin C. Graves, LASL, Los Alamos, New Mexico
44 Harry S. Jordan, LASL, Los Alamos, New Mexico
45 L. D. P. King, LASL, Los Alamos, New Mexico
46 Herbert T. Knight, LASL, NRDS, Jackass Flats, Nevada
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DISTRIBUTION (cont1)
47 William E. Ogle, LASL, Los Alamos, New Mexico
48 Fred Sanders, LASL, Mercury, Nevada
49 Oren Stopinski, LASL, Los Alamos, New Mexico
50 James E. Reeves, Manager^ NVOO, AEC, Las Vegas, Nevada
51 Otto H. Roehlk, OSD, NVOO, Las Vegas, Nevada
52 Henry G. Vermillion, NVOO, AEC, Las Vegas, Nevada
53 Robert E. Baker, AEC, Washington, D. C.
54 Col. Ralph S. Decker, SNPO, Washington, D. C.
55 Gordon M. Dunning, DOS, AEC, Washington, D. C.
56 Brig. Gen. D. L. Crowson, DMA, AEC, Washington, D. C.
57 Mail & Records, NVOO, AEC, Las Vegas, Nevada
58 J. A. Mohrbacher, Radiation Services, Pan American, NRDS,
Jackass Flats, Nevada
59-75 Author's copies
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