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 with- out 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 shownin Figures 3.238, 3.24, and 3.25. The initial-gamma station for Shot Zuni (Station 220.09C) was destroyed by the iO N. ton beet = > o bee 3 NY a @ 5 S 1 27 OF ¢ ~L ~ iW N . g I }— EL Ne © 3= @ 10° = ‘KA \N — = w a oO $ io? \ 1 poole i Liiti ion* to"! Time After Shot, Seconds i Licig \ Figure 3.23 Shielded initia] exposure rate versus time for Shot Zuni; Station 220.609C, range 7,000 feet. For unshielded rate multiply by 1.2. shock wave, and the data from this station were available only to shock arrival and are given in Figure 3.23. Figures 3.26, 5.2%, 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 presumed and that the association of a particular recorder channel with a particular-detectorsensitivity 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 thuse measured by Operation Redwing 43 Fs hif Thi AT Lele/sed