SWRHL-30r
FINAL REPORT OF OFF-SITE SURVEILLANCE
FOR THE
NRX-A4/EST TEST SERIES
by the
Southwestern Radiological Health Laboratory
U. S. Public Health Service
Department of Health, Education, and Welfare
Las Vegas, Nevada
September 19, 1966
This surveillance performed under a Memorandum of
Understanding (No. SF 54 373)
for the
U. S. ATOMIC ENERGY COMMISSION
-------
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 in-
formation contained in this report, or that the use of any information,
apparatus, method, or process disclosed in this report may not in-
fringe 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" in-
cludes 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.
63
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SWRHL-30r
FINAL REPORT OF OFF-SITE SURVEILLANCE
FOR THE
NRX-A4/EST TEST SERIES
by the
Southwestern Radiological Health Laboratory
U. S. Public Health Service
Department of Health, Education, and Welfare
Las Vegas, Nevada
September 19, 1966
This surveillance performed under a Memorandum of
Understanding (No. SF 54 373)
for the
U. S. ATOMIC ENERGY COMMISSION
-------
ABSTRACT
The Southwestern Radiological Health Laboratory provided off-site
radiation surveillance for the NRX-A4/EST Project Rover Reactor
test series which took place at NRDS test cell A. Of the six
experimental plans in the test series, four resulted in detectable
quantities of radioactivity in the off-site area as indicated below:
Experimental Plan Date Effluent Trajectory
2B 2/03/66 Northeast quadrant
3 3/03/66 Southerly at about 160°
4 3/16/66 Easterly at 82°
4A 3/25/66 Westerly at 265°
Although radioactive effluent was detected off-site from this event,
the surveillance indicated that the radiation protection guides
established by the Atomic Energy Commission (based on Federal
Radiation Council guidelines), Chapter 0524, for the off-site
population were not exceeded. The peak off-site potential thyroid
exposure was about 36 millirad at Lone Pine, California.
-------
TABLE OF CONTENTS
INTRODUCTION 1
OPERATIONAL PROCEDURES 4
A. EXTERNAL MEASUREMENTS 4
1. Ground Monitoring 4
2. Dose Rate Recorders 4
3. Aerial Cloud Tracking 5
4. Film Badges 5
5. Thermoluminescent Dosimeters (TLD) 5
B. ENVIRONMENTAL MEASUREMENTS 5
1. Milk and Water Samples 8
2. Vegetation Samples 8
RESULTS 9
A. EP-2B TEST, February 3, 1966 9
1. Ground Monitoring 9
2. Dose Rate Recorders 9
3. Film Badges and Thermoluminescent Dosimeters 9
4. Air Sampling 9
5. Milk Sampling 9
6. Vegetation Sampling 11
B. EP-2C TEST, February 11, 1966 11
1. Ground Monitoring 11
2. Dose Rate Recorders 16
3. Film Badges and Thermoluminescent Dosimeters 16
4. Air Sampling 16
5. Milk Sampling 16
11
-------
Table of Contents (continued)
C. EP-3 TEST, March 3, 1966 16
1. Ground Monitoring 16
2. Dose Rate Recorders 18
3. Film Badges and Thermoluminescent Dosimeters 18
4. Air Sampling 19
5. Milk Sampling 19
D. EP-4 TEST, March 16, 1966 19
1. Ground Monitoring 19
2. Dose Rate Recorders 19
3. Film Badges and Thermoluminescent Dosimeters 19
4. Air Sampling 22
5. Milk Sampling 22
6. Vegetation Sampling 24
E. EP-4A TEST, March 25, 1966 24
1. Ground Monitoring 24
2. Dose Rate Recorders 24
3. Film Badges and Thermoluminescent Dosimeters 26
4. Air Sampling 26
5. Milk Sampling 26
6. Vegetation Sampling 30
7. Thyroid In Vivo Counting 30
8. Water 30
CONCLUSIONS 34
APPENDIX I - Thyroid Dose
DISTRIBUTION
111
-------
LIST OF TABLES
Table 1. NRX-A4/EST test series data. 1
Table 2. Threshold detectability at time of count of several
radionuclides in air samples (90% confidence level). 7
Table 3. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-2B. 11
Table 4. Analyses of air samples collected following
NRX-A4/EST EP-2B. 12
Table 5. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-2C. 14
Table 6. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-3. 18
Table 7. Analyses of air samples collected following EP-3. 20
Table 8. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-4. 22
Table 9. Analyses of air samples collected following EP-4. 23
Table 10. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-4A. 25
Table 11. Analyses of air samples collected following EP-4A. 28
Table 12. Analysis of milk samples collected following EP-4A. 29
Table 13. Water Results - NRX-A4/EST EP-4A. 33
Table 14. Peak gamma doses detected off the test range com-
plex for NRX-A4/EST. 34
Table 15. Peak iodine concentrations as measured by air
samplers. 35
Table 16. Estimates of thyroid exposures from peak iodine
concentrations. 35
iv
-------
LIST OF FIGURES
Figure 1. Hot line locations following NRX-A4/EST
Experiments. 3
Figure 2. Sampling locations following NRX-A4/EST EP-2B. 10
Figure 3. Sampling locations following NRX-A4/EST EP-2C. 13
Figure 4. Sampling locations following NRX-A4/EST EP-3. 17
Figure 5. Sampling locations following NRX-A4/EST EP-4. 21
Figure 6. Sampling locations following NRX-A4/EST EP-4A. 27
Figure 7. Iodine-13 1 in milk, Lone Pine, Calif., following
NRX-A4/EST, 3/25/66, EP-4A. 31
Figure 8. Natural vegetation samples along Highway 95. 32
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INTRODUCTION
As a part of the Rover Program, testing and disassembling of a
series of reactors designated NRX is being conducted at the Nuclear
Rocket Development Station (NRDS) under the auspices of the
NERVA program. The subject of this report is the off-site radiol-
ogical surveillance provided by the Public Health Service (PHS)
for the Atomic Energy Commission (AEC) in support of the EP-2B,
EP-2C, EP-3, EP-4 and EP-4A experiments of the NRX-A4/EST
test series.
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 (NAFR), which includes the Nuclear Rocket Develop-
ment Station and the Tonopah Test Range. For simplicity this
area will be called the test range complex throughout this report.
The following table lists the operating times and integral powers
of each of the experiments covered in this report.
Table 1. NRX-A4/EST test series data.
Experiment Date
EP-2B
EP-2C
EP-3
EP-4
EP-4A
2/03/66
2/11/66
3/03/66
3/16/66
3/25/66
Time of
Operation
PST
1116-1123
1459-1510
1220-1230
1422-1443
1310-1316
1550-1605
1004-1020
0933-0948
Mw -sec
3.9 x
4. 3 x
8.7 x
1. 0 x
l.OSx
105
105
105
106
106
Radiation
Detectable
Off -Site
Yes
No
Yes
Yes
Yes
-------
All of the above experiments were conducted at Test Cell A. The
reactor was tested in an upright position so that the hydrogen cool-
ant exhausted upward along with escaping fission products. The
"hot lines" as estimated from ground sampling are presented in
Figure 1. The effluent from EP-2C was not detected off-site and
is thus not shown in Figure 1. The effluent eventually moved in a
south to southeast direction from the test cell.
-------
ALAMO
PA HRA NA GA T
—| 0V. LAKE
VADA . NELLIS
AIR FORCE
RANGE
0 10 20 3O 40 90
^ss^—^sa-
SCALE IN MILES
BOULDER
CITY
Figure 1. Hot line locations following NRX-A4/EST Experiments.
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OPERATIONAL PROCEDURES
A. EXTERNAL MEASUREMENTS
1. Ground Monitoring
Ground monitors tracked the reactor effluent passage with
portable instruments. Each monitor was equipped with an
Eberline E-500B, a Precision Model 111 Standard "Scin-
tillator", 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) beta-gamma detection in four scales with
an external halogen filled GM tube and a 0 to 2000 mR/hr
range, gamma only, from an internal Anton 302 tube. The
Precision Model 111 "Scintillator" is used primarily for
low level detection and provides for a range of 0 to 5 mR/hr
in six scales. The Radector has a range of 0. 05 to 50, 000
mR/hr on two scales. This instrument employs an inert
gas ionization chamber. Errors associated with these in-
struments are of the order of j^20% as calibrated with 137Cs.
2. Dose Rate Recorders
Eberline RM-11 Dose Rate Recorders are placed at twenty-two
stations around the test range complex. These recorders utilize
a Geiger-Mueller tube detector to document radiation levels at
specific locations. The instrument has a 0. 01 to 100 mR/hr
range and the gamma dose rate is recorded on a 30-hour
strip chart. The RM-11 is accurate to +.20% as calibrated
with a cesium-137 source.
-------
3. Aerial Cloud Tracking
An Air Force U3-A aircraft, manned by two Public Health
Service monitors equipped with portable instruments iden-
tical to those of the ground monitors, tracked the reactor
effluent to position ground monitors. Public Health Service
cloud sampling aircraft were also used as aids in cloud
tracking, however their primary purpose was cloud samp-
ling in order to determine cloud size and inventory. The
results of their sampling are reported separately by the
SWRHL Engineering Development Program.
4. Film Badges
The experiments took place during the months of February
and March. The PHS maintained approximately 74 film
badge stations off the test range complex and assigned
badges to 144 off-site residents during February, and
maintained 77 film badge stations and assigned badges to
132 off-site residents during March. The badge used is
made of Du Pont type 555 film. This film is accurate to
+ 50% in the 20 to 100 mR range and +10% in the 100 to
2000 mR range. The lower limit of detectability is 20 mR.
5. Thermoluminescent Dosimeters (TLD)
Approximately 20 TLD's per month were used in the off-site
surveillance program. The TLD's are used with read-out
equipment manufactured by Edgerton, Germeshausen and
Grier, Inc. , and have a lower detection limit of about 5 mR.
B. ENVIRONMENTAL MEASUREMENTS
One hundred and seven air samplers were routinely operated by the
Air Surveillance Network (ASN) in the western United States at the
time of these experiments. The air sampler used by the ASN is a
-------
Gelman "Tempest." The "Tempest" employs a Cast Model 1550
vacuum pump driven by a General Electric 1/2 horsepower motor.
The pump runs at 1440 rpm and draws an average flow rate of
10 cfm. During the time of these experiments, wider coverage
was being developed in the states of California, Utah and Nevada.
Thirty-nine air samplers were located in Nevada. Supplementary
temporary air sampler locations were established as deemed
necessary to cover cloud passage. All samplers were equipped
with Whatman 541 prefilters which have a pore size of 3 - 4 microns.
A portion of the routine samplers and all supplementary stations
were equipped with MSA Part 46727 charcoal cartridges. This is
the chemical cartridge for organic vapors and is impregnated with
stable elemental and sodium iodine and should have a fair efficiency
for methyl iodine. All air sample prefilters and charcoal car-
tridges collected following the NRX/EST series were returned to
the Southwestern Radiological Health Laboratory in Las Vegas for
analysis.
Prefilters were counted for gross beta activity in a Beckman
"Wide Beta" low background (6 + 1 cpm beta) proportional system
which has an efficiency of approximately 45% for 0. 54 Mev betas.
After an initial count, if no significant activity is detected, the
filters are counted at five and twelve days after collection. In all
other cases, filters are recounted a minimum of three times in
the first 48 hours following collection. The computational pro-
cedure employed depends upon the assumption that a decay constant
can be determined for each individual sample and that this con-
stant can then be used to extrapolate the activity to the end of the
collection period. For this purpose the general decay equation
A/A = e is employed.
-------
Filter papers and charcoal cartridges were analyzed for gamma
isotopes by placing them directly on a 4"x 4" Nal(Tl) crystal
coupled to a TMC Model 404C gamma pulse height analyzer view-
ing energies from 0 to 2 Mev. Since it was not possible to define
duration of cloud passage at all locations, reported values given
as pCi-sec/m3 represent the integrated air concentration. This
value is obtained as follows:
(activity in pCi) (sampling time in seconds) . , .
- ' - = integrated air con-
sample volume in m3 centration(pCi-sec/m3).
Threshold detectability of several radionuclides is presented in
Table 2 and is the result of an examination of previous data col-
lected under the following conditions:
a. Count time in days after fissioning as indicated by
footnotes.
b. Prefilters collect unfractionated fission products
resulting in a complex spectrum.
c. MSA charcoal collects gaseous fission products
only (primarily iodines).
d. An eight isotope matrix is employed for computation
and isotopes other than those examined are present in
amounts which are small relative to those eight.
e. Natural activity on air samples is approximately five
times system background.
Table 2. Threshold detectability at time of count of several radio-
nuclides in air samples (90% confidence level).
Sample type
Whatman No.
MSA Charcoal
1 - counted at
2 - counted at
131i
oil 50°
541 200
200
100
less than
3 days or
13ZTe-I ~^3 l" 135I 14(
1000 500 1000
200 -
400 200 400
100 -
3 days after fissioning.
more after fissioning.
'Ba-La
500
200
200
100
. Notes
of count
10 min
10 min
10 min
10 min
1
2
1
2
-------
1. Milk and Water Samples
After the release of activity from NRDS, milk samples were
collected from dairy farms and farms producing milk for
their own consumption which were believed to have been in
the cloud path. Each milk sample is counted for 40 minutes
using a 400-channel analyzer viewing an energy range from
0 to 2 Mev. All liquid samples are counted in 3. 5 liter
inverted well aluminum beakers which are placed over a
4"x4" sodium iodide crystal. The lower limit of detection
for 131I and 133 I in milk and water is 20 pCi/1 at time of
count, and all results below that value are reported as non-
detectable. The reported values have, at time of count, a
2 sigma error estimate of +^15 pCi/1 or + 10%, whichever is
greater.
2. Vegetation Samples
Vegetation samples were collected in the suspected effluent
trajectory to indicate deposition on the ground. They were
also obtained at most milk sampling locations, with an
effort made to make the sample representative of the cows'
feed. These samples were taken as early indicators of
where milk might be contaminated and were not intended to
yield intake-excretion data. For this reason the vegetation
sample results are reported simply as fresh fission products
present or not present.
-------
RESULTS
A. EP-2B TEST, February 3, 1966
A summary of the meteorological conditions on the test day is pre-
sented in Table 3. Due to the wind shear which existed on the test
day, environmental samples, e.g. vegetation, air and milk were
obtained from an azimuth of 270 to 45 . Sample locations are
shown in Figure 2.
1. Ground Monitoring
There were no detectable dose rates in the off-site area as
measured by ground monitors.
2. Dose Rate Recorders
There were no detectable dose rates in the off-site area as
measured by remote dose rate recorders.
3. Film Badges and Thermoluminescent Dosimeters(TLD's)
Film badges and TLD's exposed during February indicated no
doses above the detection limit (20 mR and 5 mR respectively)
that could be attributed to EP-2B effluent.
4. Air Sampling
The air sampler prefilters obtained from Twin Springs Ranch,
Diablo and Hiko, Nevada, contained less than 0. 2 pCi/m I.
These were the only air samples that contained fresh fission
products.
A summary of the air data is presented in Table 4.
5. Milk Sampling
Milk was sampled at four different locations following EP-2B,
as shown in Figure 2. None of the samples contained radioiodine.
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0 10 20 30 40 SO
SCALE IN MILES
ARIZONA
• Positive Air Samples
D Negative Air Sa'fnples
A Negative Milk
Samples
Figure 2. Sampling locations following NRX-A4/EST EP-2B.
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6. Vegetation Sampling
Vegetation samples collected following EP-2B contained no
activity above background levels.
Table 3. Meteorological data supplied by the Environmental
Science Serivce Agency for NRX-A4/EST EP-2B.
Sky condition : clear
Visibility : unrestricted
Upper air data at: Jackass Flats, Nevada 1000 PST 2/03/66
Height
(Ft. MSL)
SFC 3,615
4,000
5,000
6,000
7,000
8,000
9,000
10, 000
11,000
12,000
13,000
14,000
15,000
Wind Pressure
(Deg/Kts) (mb)
110/13
090/11
100/12
170/08
180/13
190/18
200/22
220/20
220/17
220/17
220/20
220/23
230/20
900
887
854
822
792
762
734
706
679
653
629
605
581
_ Dew
Temgerature point
< c) (°c)
8. 8
6.0
4. 0
2. 2
0.3
-1.5
-2.8
-1.9
-1.9
-2.8
-4.8
-7. 1
-9.6
- 6. 1
- 9. 1
-12. 0
-14. 5
-16.9
-19.4
-22. 7
-23. 7
-22.5
-16.2
-16.4
-18.4
-20. 7
Relative
Humidity
(%)
37
33
30
28
26
24
20
17
19
35
40
40
40
SFC - Surface
B. EP-2C TEST, February 11, 1966
Environmental samples (air, milk and vegetation) following EP-2C
did not contain fresh fission products. Sample locations are shown in
Figure 3. Ground monitoring and dose rate recorders also yielded
no positive measurements. Meteorological observations on the
test day are presented in Table 5.
1. Ground Monitoring
As a result of aerial cloud tracking information, ground moni-
toring was performed south of NRDS following the first
11
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Table 4. Analyses of air samples collected following NRX-A4/EST EP-2B, February 3, 1966.
Air
Location Volume
(m3)
Hwy. Maint. Stn. ,
Diablo, Nevada
Hike, 49?
Nevada
Twin Springs Rn.
Warm Springs, Nev.
Date
Time
On
2-3
Q700
1
2-3
0800
2-3
1030
Date Gross Beta Activity
Time Prefilter at end of
Off collection
pCi-sec* -3
(PCi/m3) m3 A 1U
2-4
0700
2-4
0800 '°2 2'2
2-4
0930
Col- Gamma pulse height analysis
lee- Activity (pCi/m3) at end of
tor collection
P
C
P
C
P
c
1 31 l
ND
ND
ND
ND
ND
ND
132!
ND
ND
ND
ND
ND
ND
133!
0. 17
ND
0. 18
ND
0. 16
ND
135I
ND
ND
ND
ND
ND
ND
ND - not detectable
P - prefilter
C - charcoal cartridge
* - the time shown on the running time meter is used in calculating pCi- sec rather than the time on and
time off reported by the station operator. This is done —3
because the two do not always agree due to power failures, etc.
m
-------
PA HRA NA GA T
LAKE
NEVADA , NELLIS
AIR FORCE
RANGE
0 10 20 30 40 50
5^5ia=te=^!
SCALE IN MILES
ARIZONA
ALLEY
FURNACE CR.
NAT. MON.
D Neeative Air Samples
DEATH \Q
VALLEY hHAHRUMP
A Negative Milk
Samples
Figure 3. Sampling locations following NRX-A4/EST EP-2C.
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Table 5. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-2C.
Clouds
Visibility
Upper air
Height
(Ft. MSL)
SFC 3,615
4,000
5,000
6,000
7,000
8,000
9,000
10,085
11,000
12,000
13,000
14,000
15,000
: 0.4 altocumulus, 0.5 cirrus
^unrestricted
data at:
Wind
(Deg/Kts)
090/08
000/00
080/02
020/06
030/12
040/15
030/15
030/17
010/19
020/27
360/28
010/27
010/32
Jackass
Flats, Nevada 1
Pressure Temperature
(mb) (°C)
900
888
853
820
794
759
730
700
674
646
622
597
574
3. 7
2. 5
- 1.9
- 2.6
- 1.6
- 2.8
- 4.4
- 6.2
- 7.9
- 9.5
-10.8
-12. 0
-13.3
000 PST
Dew
Point
<°C)
- 4.0
- 7. 1
-19. 3
-20.9
-21. 6
-23.9
-25. 12
-26. 7
-28. 2
-29. 0
-28. 5
-28.5
-28.4
2/11/66
Relative
Humidity
(%)
56
49
25
23
20
18
18
18
18
19
22
24
27
SFC - surface
14
-------
Table 5. Meteorological data supplied by the Environmental
Science Service Agency for NRX-A4/EST EP-ZC(continued)
Clouds
Visibility
: 0. 3 cirrus
: unrestricted
Upper air data at: Jackass Flats, Nevada 1615 PST
Height
(Ft. MSL)
SFC 3,615
4,000
5, 000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000
14,200
15,000
Wind
(Deg/Kts)
240/04
230/05
248/04
325/04
356/06
348/09
327/08
323/18
323/18
330/19
336/18
336/29
340/29
331/28
Pressure
(mb)
896
884
850
820
788
760
730
704
676
650
625
600
596
577
Temperature
<°C)
8.9
7.0
3.8
1.0
0.3
- 1. 1
- 2.8
- 4.3
- 4.9
- 6.6
- 8.8
-11.0
-11.4
-11. 1
2/1
Dew
Point
<°C)
-15.6
-15. 7
-16.6
-18. 3
-20. 6
-22. 5
-23.9
-25. 8
-23.5
-21.5
-21.0
-20.9
-20. 7
-21. 5
1/66
Relative
Humidity
(%)
16
18
21
22
19
18
18
17
22
30
37
44
46
42
SFC - surface
15
-------
segment of EP-2C. The second segment of EP-2C resulted
in a split cloud with one section headed tPwards the north*
east and the other towards the south, It was predicted that
the cloud towards the northeast would eventually move
towards the southeast and thus sampling was performed
along Hwy. 95. All ground monitoring was negative.
2. Dose Rate Recorders
No increase in activity above background was indicated on
recorders including those from Pahrump, Lathrop Wells,
and Indian Springs, Nevada.
3. Film Badges and Thermoluminescent Dosimeters
Film badges and TLD's exposed during February indicated
no doses above the detection limit (20 mR and 5 mR respec-
tively) that could be attributed to EP-2C effluent.
4. Air Sampling
As a result of aerial cloud tracking information, air samples
were collected southeast of NRDS. No air samples were
found to contain fresh fission products.
5. Milk Sampling
A milk and feed sample collected from Dansby Ranch near
Lathrop Wells, Nevada did not contain fresh fission
products.
C. EP-3 TEST, March 3, 1966
A summary of meteorological conditions on the EP-3 test day is
presented in Table 6. Environmental sampling locations (air
and milk) are shown in Figure 4.
1. Ground Monitoring
As a result of aerial cloud tracking, ground monitoring was
16
-------
TWIN ^ NYAL*
SPRING
RN.
„ ADAVEN
2
MEWCASTLE^*jCEDAR CITY
ENTERPRISE '
KANARRAVILLE
ALAMO
PA HRA NA GA T
—I 0V LAKE
NEVADA i NELLIS
AR ZONA
• Positive Air Samples
D Negative Air Samples
A
PAH RUMP
LAS VEGAS
A Negative Milk
Samples
BOULDER
CITY
^
7 .VA LL
\A FURNACE CR.
-O1 NAT. MON.
Figure 4. Sampling locations following NRX-A4/EST EP-3.
-------
Table 6. Meteorological data supplied by the Environmental Science
Service Agency for NRX-A4/EST EP-3.
Sky condition : 2/10
Clouds : Cumulus
Visibility : unrestricted
Upper air data at: Jackass Flats, Nevada 1325 PST 3/3/66
Height
(Ft. MSL)
SFC 3,615
4, 000
5, 000
6,000
7,000
8,000
9, 000
10, 000
11,000
12,000
13,000
14,000
15,000
Wind
(Deg/Kts)
030/06
020/06
360/08
340/11
330/13
320/14
320/12
330/11
340/11
350/08
330/04
330/41
330/69
Pressure
(mb)
894
882
849
815
784
754
726
697
666
638
610
584
559
Temperature
r\
ro
5.6
3.5
0.7
- 2.2
- 5.2
- 7.9
-10.7
-13.9
-17. 1
-19.6
-21.8
-19.0
-19.4
Dew
Point
-10.6
-11. 6
-13.8
-16.3
-18.3
-20.4
-22.5
-24. 7
-26. 7
-29. 7
-32.6
-32. 3
-33. 0
Relative
Humidity
30
32
33
33
35
36
37
40
43
40
37
30
29
SFC - surface
performed along the eastern side of the Amargosa Valley
along a hot line of 160 . A monitor on Hwy. 95 located
17 miles ESE of Lathrop Wells, measured intensities of less
than 0. 01 mR/hr above background during the interval of
1505 to 1540 hours PST. Positive dose rates -were not meas-
ured at other monitored locations.
2. Dose Rate Recorders
No increase in activity above background was indicated on
any of the dose rate recorders.
3. Film Badges and Thermoluminescent Dosimeters
Film badges and TLD's exposed during March indicated no
doses above the detection limit (20 mR and 5 mR respectively)
that could be attributed to EP-3 effluent.
18
-------
4. Air Sampling
Air samples from two locations contained l 3 3I on the pre-
filters and cartridges. A summary of the air data is presented
in Table 7.
5. Milk Sampling
Milk and feed samples were obtained from those locations
shown in Figure 4 following the EP-3 test. The samples
indicated no activity above background levels.
D. EP-4 TEST, March 16, 1966
The EP-4 Test resulted in detectable levels of radioactivity in the
off-site area. Meteorological conditions on the test day are presented
in Table 8. Environmental sampling locations (air and milk) are
shown in Figure 5.
1. Ground Monitoring
Highway 93 was monitored between Glendale and Alamo during
the approximate time of cloud passage. Levels of less than
0. 03 mR/hr above background were detected from 36 miles NE
of Glendale to Alamo.
2. Dose Rate Recorders
Dose rate recorders at Warm Springs Ranch, Caliente, Alamo,
Pioche and St. George did not indicate dose rates on March 16
and 17 above the local background levels (<0. 02 mR/hr).
3. Film Badges and Thermoluminescent Dosimeters
Film badges and TLD's exposed during March indicated no
doses above the detection limit (20 mR and 5 mR respectively)
that could be attributed to EP-4 effluent.
19
-------
Table 7. Analyses of air samples collected following EP-3.
Air
Location Volume
(m3)
Ash Meadows, Nevada
Jet. Ash Meadows Rd 195
and U S 95
Pahrump, Nevada 479
Date Date Gross Beta Activity Col- Gamma pulse height analysis
Time Time Prefilter at end of lee- Activity (pCi/m3) at end of
On Off collection tor collection
pCi-sec -3 isir
(pCi/m3) m3
P ND
1300 0720 >-6 106 C N°
3-3 3-4 A4 P ND
1046 1030 ' C ND
132J
ND
ND
ND
ND
1 33j 1 35 j
2. 2 ND
2. 0 ND
0.57 ND
0. 79 ND
ND - not detectable
P - prefilter
C - charcoal cartridge
-------
PAHRANAGAT
LAKE
NEVADA , N ELLIS
0 10 20 30 40 90
dS^^^S^^^^E
SCALE IN MILES
ARIZONA
ALLEY\V ,*
FURNACE CR.
• Positive Air Samples
D Negative Air Samples
A Negative Milk
Samples
Figure 5. Sampling locations following NRX-A4/EST EP-4.
-------
Table 8. Meteorological data supplied by the Environmental Science
Service Agency for NRX-A4/EST EP-4.
Sky condition
Clouds
Visibility
: 14,000 Sctd. , high
: 0.4 altocumulus, 0
: unrestricted
thin broken
. 6 cirrostratus
Upper air data at: Jackass Flats, Nevada, 1005 PST,
Height
(Ft. MSL)
SFC 3,615
4,000
5,000
6,000
7,000
8,000
9,000
10,039
11,000
12,000
13,000
14,006
15,000
Wind Pressure
(Deg/Kts) (mb)
240/10 889
230/10 879
200/09 850
210/10 815
270/10 785
300/15 755
290/17 728
280/14 700
270/18 674
270/25 649
270/33 624
280/45 600
280/51 576
Temperature
<°C)
15.2
12.5
9. 5
6.5
5.9
3.4
0.9
- 2.0
- 4.5
- 5.6
- 7.5
- 9.4
-11.0
3/16/66
Dew
Point
- 5.8
- 6.5
-7.6
- 9.4
-10.8
-13.4
-16.0
-18. 9
-21. 1
-24.0
-26.6
-28.8
-29.6
Relative
Humidity
23
26
29
31
29
28
27
26
26
22
20
19
20
SFC - surface
4. Air Sampling
Samples containing radioiodines were obtained from Alamo,
Butler Ranch turnoff and Highway 93, Warm Springs Ranch,
Glendale and Caliente, Nevada, and Cedar City and Parowan,
Utah. Negative samples were obtained at other locations as
shown in Figure 5. Table 9 presents the results of air filter
analyses.
5. Milk Sampling
Milk and feed samples were obtained in the area of the effluent
path on March 17, at locations shown in Figure 5. All results
were negative. At all sampled locations the animals were
not yet on pasture.
22
-------
Table 9. Analyses of air samples collected following EP-4.
ro
Air Date Date Gross Beta Activity
Location Volume Time Time Prefilter at end of
(m3) On Off collection.
pCi-sec .. lft-
Alamo, Nevada
Butler Ranch turnoff
and Hwy 93, Nevada
Glendale Jet. , Nevada
Caliente, Nevada
Warm Springs Rn. , Nev
Cedar City, Utah
Parowan, Utah
489
20
96
348
502
372
448
(PCi/m3)
3-16 3-17
0750 0800
3-16 3-16
1350 1600
3-16 3-16
1230 1718
^0 ^835 »•"
3-16 3-17
0800 1010
3-16 3-17 n ,,
1515 1250 °'36
3-15 3-16
2230 2230
m 3
560
8700
13000
470
250
270
220
Col- Gamma pulse height
lee- Activity (pCi/m3)at
tor collection.
2
131 J 132 j 133 j
p
C
P
C
P
C
P
C
P
C
P
C
p
C
0. 35
25
ND
2.4
1.6
0. 57
0. 58
0.21
ND
0. 30
0. 37
0. 18
ND
75
ND
4.6
1.2
1.6
0.47
0.42
ND
ND
ND
ND
0.82
24
6.1
. 73
1. 7
1.2
0. 98
0. 34
ND
0. 35
0.85
0.41
analysis
end of
135 j
ND
ND
7.9
9.6
1.7
0.91
ND
ND
ND
ND
ND
ND
ND - not detectable
P - prefilter
C - charcoal cartridge
-- - sample not obtained
-------
6. Vegetation Sampling
An experiment to compare fallout trays versus vegetation
samples was conducted by PHS on the Nevada Test Site.
o
The results from both clearly indicated a hot line of 82 at
a distance of 14 miles from Test Cell A, or 6 miles south
of CP-1 on the Mercury Highway.
E. EP-4A TEST, March 25, 1966
Radioactivity was detected off-site following the EP-4A Test.
Meteorological conditions on the test day are presented in
Table 10.
1. Ground Monitoring
Monitors located on Highway 95 detected cloud passage with
survey instruments. Monitoring was performed along high-
ways in a south-southwesterly quadrant from the test site.
A monitor located 14 miles SE of Beatty, along Highway 95,
detected an external gamma dose of 2. 7 mR (integrated
exposure from E-500B) due to cloud passage. The infinite
dose at this unpopulated location is estimated to be 17 mR.
Ground monitors were able to locate activity (<0. 03 net
mR/hr) in the area between Lone Pine, California and
Stovepipe Wells.
2. Dose Rate Recorders
The RM-11 dose rate recorder at Beatty, Nevada, indicated
a dose rate of up to 0. 02 mR/hr above background between
1330 and 1830 hours on March 25. A dose of 0. 05 mR
above background was calculated by integration of the
dose rate with time. The other recorders did not show
a significant exposure above background.
24
-------
Table 10. Meteorological data supplied by Environmental Science
Service Agency for NRX-A4/EST EP-4A
Sky condition
Clouds
Visibility
Upper air data
Height
(Ft. MSL)
SFC3.615
4,000
5,000
6,000
7,000
8,000
9,000
10, 000
11,000
12,000
13,000
14,000
15,000
: 7000'
Sctd. , High
: 0.4 Stratocumulus
Sctd.
, 0. 1 Cirrostratus
: unrestricted
at: Jackass Flats, Nevada 0940
Wind
(Deg/Kts)
100/08
100/08
100/09
080/07
070/09
080/10
080/11
080/13
080/15
080/21
080/24
090/26
080/33
Pressure
(mb)
889
875
847
816
785
756
729
703
674
649
622
599
575
Temperature
<°0
17.8
16.0
12.4
9.1
6.2
3.3
0.3
- 2. 2
- 5. 7
- 7.6
- 9.4
-11. 3
-13. 0
PST 3/25/66
Dew
Point
(°C)
- 2.5
- 4.6
- 6. 1
- 6.7
- 8. 1
- 9.0
-10. 5
-11.5
-11. 0
-14. 9
-16.5
-21.5
-26.6
Relative
Humidity
(%)
25
24
27
32
35
40
44
49
66
56
56
43
31
SFC - surface
25
-------
3. Film Badges and Themoluminescent Dosimeters
Film badges and TLD's exposed during March indicated no
doses above the detection limit (20 mR and 5 mR respectively)
that could be attributed to EP-4A effluent.
4. Air Sampling
Samples containing fresh fission products were obtained at
several locations. All sampled locations are shown in
Figure 6. The peak concentrations in air were detected
at Lone Pine, California where it is estimated the potential
thyroid exposure was 3. 6 mR, primarily due to inhalation of
131 I and 133I. This assumes that all the 131I and 133I as
collected on the prefilter and charcoal cartridge are bio-
logically available for thyroid uptake from inhalation. A
summary of the air sampling data is presented in Table 11.
5. Milk Sampling
Milk and feed samples were obtained at several locations
in California and Nevada as indicated in Figure 6. Radio-
iodine was detected in milk from Lone Pine, Independence,
and Big Pine, California. The peak concentration was
140 pCi of 131T/liter and 230 pCi of 133 I/liter; this occurred
in Lone Pine milk collected from the evening milking on
March 27. Milk sampling results are presented in Table 12.
The potential thyroid dose to an infant's thyroid from 131I
ingestion at Lone Pine is estimated to be 22 millirad. The
133 I ingestion dose is estimated to be 3 mrad. The cows'
feed at the three locations was primarily made up of dry
feed (hay), and less than 10% of the total intake was grass.
A plot of the radioiodine concentrations in milk is presented
26
-------
C\)
^J
Positive Air Samples
Negative Air Samples
A Positive Milk Samples
A Negative Milk Samples
Figure 6. Sampling locations following NRX-A4/EST EP-4A.
-------
Table 11. Analyses of air samples collected following EP-4A.
[SJ
oo
Air
Location Volume
(m3)
Beatty, Nevada 442
Hwy. 95, 15 mi NW
of Lathrop Wells, Nev.
Hwy. 95, 25 mi NW 4g
of Lathrop Wells, Nev.
Lathrop Wells, Nev. 473
Scotty's Jet., Nev. 299
Stovepipe Wells, Calif. 386
Lone Pine, Calif. 432
Bishop, Calif. 398
Barstow, Calif. 546
Date
Time
On
3-25
0753
3-25
1130
3-25
1055
3-25
0640
3-25
1705
3-25
1140
3-25
0948
3-25
1010
3-25
0700
Date Gross Bet
Time Prefilter
Off colle
(pCi/m3)
3-26
0733
3-25
1545
3-25
1540
3-26
0605
0905
3-26
0930
650
3-26
0624
ms 4'7
a. Activity Col- Gamr
at end of lee- Acti\
:ction tor
pCi-sec ,n-3 131 r
2 X 1 U
1,400
990
2,400
600
1, 700
2,400
56, 000
490
510
P
C
P
C
P
C
P
C
P
C
P
C
P
C
P
C
P
C
J.
ND
1.2
ND
ND
ND
ND
1.9
ND
ND
ND
6.7
2.4
61
25
ND
ND
ND
ND
na pulse height
rity (pCi/m3 ) at
collection
1 32 j 1 33 J 1
ND
ND
ND
6.1
ND
6.0
ND
ND
ND
ND
ND
1.2
ND
12
ND
ND
ND
ND
0.87
ND
5.6
16
7.9
11
ND
0.56
1.5
0.56
ND
6.8
70
74
0.86
ND
0. 50
ND
analysis
end of
35I
ND
ND
ND
1.6
ND
23
ND
0.63
ND
ND
ND
3.0
ND
ND
ND
ND
ND
ND
ND - not detectable
P - prefilter
C - charcoal cartridge
-------
Table 12. Analysis of milk samples collected following EP-4A.
Location
Lone Pine, Calif.
Independence ,
California
Zucco Ranch
Big Pine, Calif.
Date
Collected
3/26-am
3/27-am
3/27-pm
3/28-am
3/28-pm
3/29-am
3/29-pm
3/30-pm
3/31-am
3/31-pm
4/01-am
4/02-am
4/03-am
4/04-am
4/11-am
3/29-pm
3/30
3/31-am
4/01-am
3/26-am
3/27
3/28-am
3/28-pm
3/29-am
3/30-am
3/30-pm
3/31-am
A A\^O\^IAV^^ \S±
Radioiodine
in feed.
X
X
-- '
X
X
X
X
X
X
X
X
--
--
X
ND
X
X
X
ND
X
X
ND
--
--
ND
ND
ND
^-*u- i A.** i it* KS VAJ. u v*
height analysis
(pCi/liter)
1 31j 1 33 j
ND
110
140
100
100
60
90
70
50
90
60
50
50
30
ND
ND
20
ND
ND
ND
30
40
ND
20
ND
50
180
230
70
40
ND
30
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND - not detectable
x - radioiodine present
-- - sample not collected
29
-------
in Figure 7. The 3 I level was observed to decay with a
half-life of 4. 5 days, close to the 5 day value assumed by
the Federal Radiation Council.
6. Vegetation Sampling
Vegetation samples were taken on Highway 95 north and
southeast of Beatty to determine a hot line and cloud profile
at that distance. As seen in Figure 8, the peak occurred
at 10 miles SE of Beatty, or 24 miles at 260° from Test
Cell A.
Vegetation samples, containing fresh fission products,
other than the samples previously mentioned (milk results
and Highway 95), were also obtained at Barstow, Inde-
pendence (Loden Ranch), Olancha (Hayhorst Ranch), and
Stovepipe Wells, California. Milk samples were not
available from Stovepipe Wells, but milk from the other
locations did not show the presence of fresh fission pro-
ducts because the cows were not on fresh feed.
7. Thyroid In Vivo Counting
Thyroid in vivo counting was performed on two ground moni-
tors who were located on Highway 95 during cloud passage.
In both cases the thyroid doses were negligible.
8. Water
Water samples containing fresh fission products were
obtained from Lone Pine and Olancha, California. The
results are given in Table 13. The water was not used
for human consumption.
30
-------
300
200--
tf
w
H
en
8
90-
10-
70-
60-
50--
40--
30--
20--
10-
* *
25
MARCH
27
* *
*
29
31
DATE
1
2
APRIL
Figure 1. IODINE-131 IN MILK, LONE PINE, CALIFORNIA
FOLLOWING NRX-A4/EST, 3/25/66, EP-4A.
31
-------
Figure 8
NATURAL VEGATATION SAMPLES ALONG HIGHWAY 95
HOT LINE
AT 260"
MONITOR'S THYROID
DOSES-O.O-mRAD
864
MILES NORTH
202
BEATTY
468
. MILES
10 12 14
SOUTH
18 20
-------
Table 13. Water Results--NRX-A4/EST EP-4A
pCi/liter
Location Date 131I 132I
Lone Pine, Calif. 3_2?
Lone Pine Dairy
Lone Pine Calif. ^ J5Q ?()
1 mi south
o', ^-28 .HO ND
Hay ho r si. Hancn
33
-------
CONCLUSIONS
The effluent from four of the tests in the NRX-A4/EST series was
detected off-site. The potential population doses were insignificant
compared to the AEC Standards.
The AEC radiation protection standards for the average dose to a
suitable sample of population are :
whole body radiation - 170 millirem/year
thyroid exposures - 500 millirem/year
The peak external gamma doses detected off-site from the various
tests are given in Table 14.
Table 14. Peak gamma doses detected off the test range complex
for NRX-A4/EST. (Populated locations noted)
Test
EP-2B
EP-2C
EP-3
EP-4
EP-4A
EP-4A
Hwy. 95
Hwy. 93
Beatty,
Location
, 17 mi SE of Lathrop Wells
between Glendale & Alamo
Nevada (populated)
14 mi SE of Beatty on Hwy. 95
Dose or dose rate
not detectable
not detectable
< 0. 01 mR/hr
<0. 03 mR/hr
< 0. ImR
17mR
Table 15 gives the peak radioiodine levels as measured from the air
samplers (prefilter and charcoal cartridge). Fresh fission products
were detected off-site following all tests except EP-2C.
(1) U.S. Atomic Energy Commission Manual Chapter 0524, Standards
for Radiation Protection.
34
-------
Table 15. Peak iodine concentrations as measured by air samplers.
Col- Iodine concentration
Test
EP-2B
EP-3
EP-4
EP-4A
Location
Hiko, Nevada
Jet. Ash Meadows Road
and U S 95, Nevada
Butler Ranch turnoff
and U S 93, Nevada
Lone Pine, Calif.
lec-
tor
P
C
P
C
P
C
P
C
in pCi/m 3 (End of
collection)
1 31j 1 3Zj 1 33j 1 35 i
ND
ND
ND
ND
25
ND
61
25
ND
ND
ND
ND
75
ND
ND
12
0. 18
ND
2.2
2.0
24
6.1
70
74
ND
ND
ND
ND
ND
7.9
ND
ND
Collection
Time(hrs)
19.7
18. 5
2.2
23.8
ND - not detectable
P - prefilter
C - charcoal cartridge
Assuming a person were present at the location where the iodine concen-
trations in Table 15 were measured, the potential thyroid exposure
from inhalation of radioiodine can be estimated (Appendix 1). These
estimates are given in Table 16. It was assumed that the iodine
from both the filter and charcoal cartridge was biologically avail-
able to the thyroid.
Table 16. Estimates of thyroid exposures from peak radioiodine air
concentrations.
_ T . Dose to thyroid in _
Test Location ,/?\ Total
millirad v^/
1 31j* 1 33j**
EP-2B
EP-3
EP-4
EP-4A
Hiko, Nevada
Jet. Ash Meadows Rd.
and US 95, Nevada
Butler Ranch turnoff
and US 93, Nevada
Lone Pine, Calif.
ND
ND
<0. 1
2.52
< 0. 1
< 0. 1
< 0. 1
1. 14
< 0. 1
< 0. 1
< 0. 1
3. 7
(2) Based on ICRP "Standard Man", Publication 2(1959)
131 3.42 x 10"' millirad
><• Conversion factor for J I dose ~ :—^ -8
. . _ ••**.* 133 T j pCi-sec/mJ 9.21 x 10 millirad
vv Conversion factor for JJI dose — -.—:
pCi-sec/m A
35
-------
The potential exposures in Table 16 are less than 1% of the AEC
standard for the thyroid exposure to a suitable sample of the popu-
lation(500 millirern per year).
Radioiodine was not detected in milk except for the EP-4A test (cows
were not on fresh feed or green chop for the EP-4 test). The peak
milk concentration for the EP-4A test occurred in Lone Pine,
California (140 pCi/liter of 131I and 230 pCi/liter of 133I). The
half-life in milk was observed to be about 4. 5 days or about that
(3)
assumed by the Federal Radiation Council. From data given in
(3)
FRC No. 5 Page 14, it is estimated that the thyroid dose to a
child with a 2 gram thyroid would be 22 millirem(mrem) due to 3 I
ingestion.
The parameters for the FRC dose model for 131I in milk are
generally based on average values. A refinement of the 13II cal-
culation, based on specific information from the samples at Lone
Pine, indicates a potential dose around 16 mrad from the 131I
(peak occurred earlier than in FRC-model and effective half-life of
31I in milk was about 4. 5 versus 5 days). It should be noted that
the estimated half-life was based on limited data, but it appears
that the potential dose was less than that based on the FRC
assumptions.
An additional 3 millirern exposure could have resulted from ingestion
of 133 I in milk, resulting in a total exposure about 19 mrem(based
on parameters from event). Assuming the inhalation close to a child
•r
is about three times that of an adult , the inhalation dose would be
about 11 mrem(from Table 16). Thus an estimate of the total poten-
tial dose would be 30 mrem or about 6% of the AEC standard for a
suitable sample of the population. Using the FRC assumptions the
potential dose would have been about 7% of the AEC standard.
(3) Background Material for the Development of Radiation Protection
Standards, Federal Radiation Council Report No. 5, July 1964.
* Based on child with 2 gram thyroid breathing 6 m3/day and other
parameters equivalent to those of ICRP(Appendix 1).
36
-------
Appendix I
Thyroid Dose
Thyroid Dose (D) rads = f x 3> ? x 1Qio dis x g> ^ ^ J()4 sees
curie-second a sec-curie day
meter3
•00
x E x 1. 6 x 10~6 6r^S x B x — x -rrr ergs x \ e "' dt
mev M 100 ^=^=- ) Te
gram
fa = fraction of inhaled iodine that reaches thyroid = . 23
E = energy to thyroid/disintegration = .23 mev 131I
E = energy to thyroid/disintegration = . 54 mev I
"~4 t
B = breathing rate = 2. 32 x 10 m /second
— = mass of thyroid = -r— grams
m 20
Te = effective half-life = 7. 6 days 131 I
Te = effective half-life = . 87 days 133I
Rad = 1.97 x 102 x E x Te
curie-sec
-7
3.42 x 10 millirad
curie-sec pCi-sec/M3 ( 131I)
M3
Rad = 9.21 x 10"8 millirad
^^^"^^^^^^^^ — 7. t-J. A. A \j IIIJL J.XA i ena /
curie-sec ^ T-J-JT (
r-T3— pCi-sec/M
-------
DISTRIBUTION
&
1 - 15 SWRHL, Las Vegas, Nevada
16 James E. Reeves, Manager, NVOO/AEC, Las Vegas, Nevada
17 Robert H. Thalgott, NVOO/AEC, Las Vegas, Nevada
18 Henry G. Vermillion, NVOO/AEC, Las Vegas, Nevada
1Q D. H. Edwards, Safety Evaluation, NVOO/AEC, Las Vegas, Nev.
20 D. W. Hendricks, Rad. Safe. Br., NVOO/AEC, Las Vegas, Nev.
£1 Central Mail & Records, NVOO/AEC, Las Vegas, Nevada
22 A. J. Whitman, NTSSO, NVOO/AEC, Mercury, Nevada
23 - 24 R. Decker, SNPO, Washington, D. C.
25 D. Smith, SNPO-C, Cleveland, Ohio
26 - 27 J. P. Jewett, SNPO-N, Jackass Flats, Nevada
28 - 31 R. Nelson, SNPO-N, NRDS, Jackass Flats, Nevada
32 William C. King, LRL, Mercury, Nevada
33 Roger Batzel, LRL, Livermore, California
34 H. L. Reynolds, LRL, Livermore, California
35 - 36 H. T. Knight, LASL, Jackass Flats, Nevada
37 P. Gothels, LASL, Los Alamos, New Mexico
38 H. S. Jordan, LASL, Los Alamos, New Mexico
39 Charles I. Browne, LASL, Los Alamos, New Mexico
40 William E. Ogle, LASL, Los Alamos, New Mexico
41 H. G. Simens, NTO, Aerojet-General Corp., Jackass Flats, Nev.
42 G. Grandy, WANL, NRDS, Jackass Flats, Nevada
43-44 E. Hemmerle, WANL, Pittsburgh, Pennsylvania
45-46 S. Z. Mikhail, NRDL, San Francisco, California
47 - 48 M. I. Goldman, NUS, Washington, D. C.
49 - 50 J. Mohrbacher, Pan Am. World Airways, Jackass Flats, Nev,
51 P. Allen, ARL, ESSA, Las Vegas, Nevada
-------
52 H. Booth, ARL, ESSA, Las Vegas, Nevada
53 C. Anderson, EG&G, Las Vegas, Nevada
54 Byron Murphey, Sandia Corporation, Albuquerque, New Mexico
55 Brig. Gen. Edward B. Ciller, DMA, USAEC, Washington, D. C.
56 - 57 Chief, NOB/DASA, NVOO/AEC, Las Vegas, Nevada
58 - 62 Charles L. Weaver, USPHS, NCRH, Rockville, Md.
63 Victor M. Milligan, REECo, Mercury, Nevada
64 Nevada Southern University, Library, Las Vegas, Nevada
65 - 66 DTIE, USAEC, Oak Ridge, Tennessee
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