base required to return the overlaying acidimetric dye to its preirradiation pH value was a measure of the acid produced by the absorbed dose. Use of predetermined data for the system in respect to sensitivity to Cogamma radiation (namely the milliequivalents of acid produced per ml
of chlorinated hydrocarbon per r absorbed) and division of these values into the acid produced by
the unknown exposure yielded the gamma doses inr. The Air Force dosimeters from Shots
Cherokee and Zuni were read in the field by 1st Lt. S.C. Sigoloff, USAF, of Project 4.1, The
remainder of the dosimeters were forwarded to the United States for reading and evaluation by
the furnishing agency.
Density
*
2.2.4 Radiac Detector DT-60/PD: Project 2.72 supplied 175 DT-60’s, which were exposed
to Shots Flathead and Navajo. Those exposed to less than 600 r were read on site, while the
ones exposed to larger doses were read and evaluated at the Naval Medical Research Institute.
—
@ Ecstmon 548-006
@
Eastman 548-0 S¢
—
°
a
1
a
©
0°
ee
10°
L
bot
Exposure , roentgens
to®
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dk
tt
10°
Figure 2.3 Co" calibration curves for film types,
(Film in NBS holder.*
These dosimeters have an accuracy of about 20 percent. (A technical description and an evaluation of this instrumentis found in References 16, 17, 22, and 23.)
2.2.5 Radiac Set AN/PDR-39. These instruments, calibrated with Co", were used to meas-
ure the exposure rate in fields of residual-gammaradiation whenever these flelds would affect
the data. The AN/PDR-39 was a military standard, field-type, portable instrument used for
detecting and measuring gamma-exposure rates (Reference 24), Evaluation of the TIB (AN/PDR-
39) in WT—1138 (Operation Teapot Project 6.1.2) applied primarily to earlier-time residual
fields (up to H + 50 hours). Since Operation Redwing Project 2.1 used these instruments in residual fields at H + 80 to H + 100 hours, the errors noted in WI-1138 would be somewhat smaller.
The AN/PDR-39 had an accuracy of about 20 percent.
2.2.6 Quartz-Fiber Device (Rate Device) for Exposure Versus Time.
This device incorpora-
ted eight quartz-~fiber dosimeters connected to a battery of zeroing potential.
17
The dosimeters