CHArT2£R 3
PROGRAM 2 = NUCLEAR RADIATION STUDIES
3-1
Project thmber:
oe
-
Sponsor:
2.1
Title:
AFSUP
po
Total Gamma Exposure
Measurement
Performing Agency:
Project Officer: Capt Robert Dempsey, USA
3.1.1
Evans Signal
Laboratory
Cbhiective
To document total ganma rediation dose as a function of distance
end direction for the various™
types of high yield nuclear devices to be
tested,
To provide total ganma
dation dosage neasurements at positions
of gamma time-intensity and neutren-flux measurements for purposes of
correlation and calibration,
The limited total gamma soldaat available from the IVY tests
indicate considerably higher values of gamma dosage for high yield
devices than expected. “Scaling laws that apply over a wide range of
sizes for small. yield devices do not apply for those of high yield,
primarily because of the striking effectof the; shock wave on the
gamma radiation attenuation for the latter. (Itis thus important to
document total gamma radiation dose for high:lyteld devices to provide
a basis for its quantitation prediction and fdr evaluating its significance relative to other effects.
:
z
3.1.2 Procedure
2
end
poy
A number of dental films of overlapping sensitivity, covering
the range of gamma dosage from 1 roentgen to 40,000 roeéntgens, will be
placed in Hational Bureau of Standards type holders. Controlfilms
will be field calibrated against standard cobalt-60 sources followed
by laboratory betatron recalibration. A number of stations willbe
activated for each event, providing from 10 to 25 measurements.’per
shot. Some of these measurements will be made at Froject 2.2station
locations, some at positions along reefs and others 50 ft below high
tide line at island positions. In addition, film packets will be placed
at Project 2.3 stations.
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