Project 2.9, Gamma Dose Measurements, was a new project approved

for the shot.

Its objective was to measure gamma dose as a function of

time and distance from the device.

The basic type of instrument was the

NBS film badge. The film badges were displayed along ground lines to giv
total gamma dose versus distance. Also, they were used in film dosimeter
transport devices which exposed individual film badges for known time peri

The periodic exposure of film badges over an extended time interval perm!
ted a determination of the initial and residual dose rates. Film badges ari
being processed and data are not available at this time.

Project 2.10, Residual Radiation, was also created specifically for pa:

ticipation on Quince and Fig and had the objective of

documenting the resid

gamma field intensities produced by the surface detonation of the device.
The required data were obtained by means of radiological surveys conducte
both on the ground by monitoring teams and from the air by means of a

probe lowered to 2 3-ft height from a helicopter. The results indicate the
radiation intensities at the lip and crater of shot Fig were above 10,000 r/
at H + 30 min, which would necessitate avoidance of this area by troops ac

vancing at an early time. The area contaminated by fallout to levels of
military significance was less than expected by a factor of 2.5 according tc
thepresent scaling laws.
"
The early decay measurements show that the normal fission product

decay rate, t-'?, is not applicable for a period from H + 1 to H + 3 hr.
Instead, the decay rate is t™'-™, which is faster. However between H + 3

and H + 24 hr, the decay rate was only t~**™which is slower than the nor
mal fission product decay rate.

The third newly approved project, Project 2.11, had the mission of
making gamma, neutron, and thermal measurements as a function of altitud
for this event. A polyethyiene balloon was moored 300 ft from ground zen
and appropriate instrumentation was exposed at various altitudes up to 150(
ft by attachment to the balloon mooring cable. Fission foila were too acti

to count at the EPG and will be counted in the ZI.

Film for gamma dose

measurements is being developed. Due to mechanical difficuities caused by
adverse weather conditions, no thermal measurements were made.
Project 8.7, Thermal Measurements, measured the radiant exposure

in cal/cm? and the thermal irradiance in cal/cm?/sec at various distances

from surface zero for the subkiloton device. Instrumentation consisted of
seven CWL Thermistor Calorimeters located from 150 to 600 ft from surface zero; two NRDL Disk Calorimeters located at 450 and 900 ft from su:
face zero; and four NML Radiant Exposure Meters located at 350, 450, 60(
and 750 ft, respectively. The CWL instrument data were recorded in an
instrument shelter 1200 ft from surface zero; the NRDL tnstruments were
self-contained. No data are presently available from the NML meters, whi

have been forwarded to NML for reading and calibration.
39

The CWL Ther-

Select target paragraph3