all the quartz-fiber dosimeters in the rate devices to activate at an early time. As a result, they yielded only total initial plus residual exposure data. Station 211.01 was partially blown out of the ground. The rate device did not drop, thus the station yielded only total initial plus residual exposure information. The 1-minute drop timers were corroded and did not function. Consequently, the estimates of residual exposure on Sites Dog and Easy were not accurate. 3.7 SHOT TEWA Table 3.13 gives Shot Tewa instrumentation and recovery data, and Table 3.14 shows residualexposure data. Data from the Charlie-Dog reef, including scattered initial-gamma data is listed in Table 3.15. Total-gamma exposures at Stations 113.03 and 113.09 were well established. Residual-exposure estimates were obtained fromStations 113.02 and 113.03. These stations were in the same general TABLE 3.9 SHOT DAKOTA INITIAL EXPOSURE Shot time was 0606, 26 June 1956. Stati Number Timing Fil Ex eure Postshot Residual Residual r r 105 50 1.17 x 10 4,600 90 50 2.47 x 10 15 25 5,135 6,605 65 50 4,485 6,650 65 50 * 705 7,220 r 211.01 Total 1.17 x 108 Total 2.48 x 104 Blast Blast 1.67 x 10! 213.01 Total 5,175 f 211.02 Blast Total 4,600 12.04 212.0 Total 1 minute Estimated Preshot p 212.03 Calculated 1.060 880 830 Initial Distance ft 5 ‘ 4,422 5,500 * This result was obtained by subtracting the 1-minute value from the total value. The other estimates were based onthis value. t This result was obtained by subtracting the total Flathead exposure value of 725 r ‘from the Flathead plus Dakota exposure value of 5,900 r. area and had the same geometry and recovery rates but were in a region where theinitial-gamma exposures were negligible. Film at Stations 113.04, 113.07, and 113.08 read greater than 70,000 r. The chemical data at 113.04 appeared valid. The chemical data at Station 113.08 was probably in error, since it contradicted both the film data at Station 113.08 and the chemical data at Station 113.04, and was far below the predicted level. The exposures expected at Station 113.07 were far above the useful range of the chemical dosimeters and it is probable that they saturated, and that the actual exposure was much greater than 650,000 r. There was no satisfactory explanation for the discrepancies that occurred in the chemical data derived from Stations 113.07 and 113.08. The discrepancies observed in the chemical data from 113.07 and 113.08 suggested that the reliability of the chemical dosimeter systems might have been questionable when they were used in the environment which existed at Stations 113.04, 113.07, and 113.08. These chemical dosimeters were exposed to a total gammadose that was much higher than their upper range, and they were probably exposed at a very high dose rate and to a very high neutron flux. It was felt that the initial-exposure data from 113.03 was reliable since the total exposure was well established and the residual estimate was valid. Data from Stations 113.03, 113.04, and 113.09 agreed with results from previous events. 35