factor was derived from the field measurements at station 221.06, Shot Flathead, where
one detector was inside and the other was outside the blast housings. On the other hand,
Figures 3.2, 3.4, 3.5, 3.6, 3.10, 3.11, and 3.12 present data from detector heads without blast shields. These detectors were calibrated for free-field conditions (Co®?) and
gave free-field data.
3.2
INITIAL-RADIATION MEASUREMENTS
The results from the initial-gamma stations are shown in Figures 3.23, 3.24, and
3.25. The initial-gamma station for Shot Zuni (Station 220.09C) was destroyed by the
10°
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Time After Shot, Seconds
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Figure 3.23 Shielded initial exposure rate versus time for Shot Zuni;
Station 220.69C, range 7,000 feet. For unshielded rate multiply by 1.2.
shock wave, and the data fromthis station were available only to shock arrival and are
given in Figure 3.23. Figures 5.26, 3.27, and 3.28 present the total-initial-gamma exposure as a function of time.
‘The initial-gamma-exposure-rate data presented are subject to uncertainty in absolute magnitude. Data reduction indicated a strong possibility that the wiring of the
magnetic-tape recorders might not have been the same as previously presumedand
that the association of a particular recorder channel with a particular-detector-
sensitivity range might have been incorrect.
The wiring could not be checked in the
laboratory because the equipment had been disassembled at the termination of the field
phase of the cperation. Subsequent analysis of the recorded pulse shapes has led to the
association assumed for the initial-gamma data presented herein, and the derived
total-exposure values agreed reasonably well with those measured by Operation Redwing
43
ps “fil hele
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Lelese/