No critical recoveries were delayed more than 24 hours. Roll-up operations pe in the Yurochi-Aomoen chain were curtailed by the contamination resulting from | neil re e can out observed at Eniwetok Atoll (on Par Eniwetok) during the operation resulted from Fallout started at approximately 1500, July 21, and ended approximately — 0800, July 22. Peak intensity measured on Parry reached 100 to 120 mr/hr depending upon the location. Early decay was rapid, but after 48 hours the decay of theactive material followed the fission product ‘decay curve. The impact of this dose rate on the Eniwetok roll-up was such that a 7 r total dose limit was established by CJTF 7 for 7.1 and 7.5 personnel. Fallout was observed at Bikini (Enyu) one day afte Maximum level observed was 12 mr/hr. Th minor fallout on Enyu; maximum level observe e was 10 mr/hr. A total of approximately 500 water and soil samples were handled at both atolls by laboratory personnel. Swimming areas at both atolls were declared off limits for several days following certcin of the shots that significantly increased the lagoon contamination levels. An arbitrary limit of 50,000 disintegrations per minute per liter of water was established as the tolerance level for swimming. dni ion re 4.7.4 Official Dosimetry ited. ure 78 1 to reom ion on d as prep- 17 The permanent badge program was designed to provide a dosage-indi- cating device to all personnel in the Task Force. Issue of the first permanent badges was made on April 15, 1956, with exchange scheduled approxi- mately each six weeks. As the operational phase progressed, it was found that permanent badges in use in excess of four weeks were badly watermarked and difficult to read. As a result, the exchange period for TG 7.1 and TG 7.5 was shortened to three weeks. During the operation approximately 40,900 permanent badges were issued, processed, and recorded. The mission badge program was designed to provide a rapid determination of the dosage an individual had received while participating in recovery or construction missions in radex areas. Only those personnel en- tering a radex area were provided with mission badges. No deficiencies were noted in these badges as the usual period of wear was approximately 12 hours. A total of 30,000 mission badges were processed at Eniwetok, and approximately 20,000 at Bikint. All film processing and record posting were done manually. As a result, approximately 40 individuals out of the entire Task Unit strength were assigned to the dosimetry and records sections. ea. - 151 -