ADPEMBIX I EXTERNAL GAMA DATA During the operation four camma intensity readings daily were taken at the populated off-site atolls utilizing a radiac meter AN/PDR 27F, calibrated against a standard consisting »f 7 micrograms of Nadium. Following each test hourly reedings were taken for an interval of time dependent upon fallout forecasts, wind conditions at and following test time, cloud tracking, and readings obtained at the atolls. The attached tables and charts show the weighted daily averages of these readings for the atolls at which stations were maintained. An estimated cumulative exposure of the population of these atolls resulting from operation HAFDTACK has been computed based on the meter readings. These exposures are tabulated and are compared with a calculated 70 year dose in TARLE I. The computation for these exposures are attacned, The two exposures agree quite well when one considers that one is an infinite exposure. In a further comparison, the indicated dose on the film- badges exposed for the entire operation is also included. TAPLE I, ATOLL COMULATIVE WOTHO 142 mr 194 mr RONGELAP 285 mr 469 or 393 mr UJELANG 222 mr 251 mr 334 mr UTIRIK 230 mr 399 mr 307 mr PARRY IS, 2.605 pr 3.492 ir - CALCULATED 70 YEAK BOSE FILM PADGE DOSE Badge Watermarked /+ EXPOSURE