See ana 8 er, a BAe. ent an ne a mee 4.7.3 Operations In support of TG 7.1 and 7.5 at both Bikini and Eniwetok, check points were established as required. Main check points utilized at all times at both atolls were located at the air dispatcher’s office and the marine landing. All personnel entering or returning from a radex area were processed through the check points. An area was considered as a radex area if the contamination exceeded 100 mr/hr. Full protective clothing was required for entry into a radex area. Limited radex areas were established when the contamination level was above 10 mr/hr, but less than 100 mr/hr, Clothing requirements varied with the situation in the limited radex areas, An area contaminated to a level less than 10 mr/hr was considered nonradex. The following is a summary of rad-safe processing: 1. A total of 1560 parties, containing from 1 to 50 men perparty, were processed through the Eniwetok check points from May 5, 1956, to July 20, 1956. Approximately 9500 personnel were processed through Bikini ata Pee ore ee Carag ay. oes check points during the same period. The personnel decontamination station at Eniwetok handled a total of 1558 individuals, while the facility at Bikini processed 3350. 2. At the equipment decontamination facility at Eniwetok a total of 225 vehicles, ranging from jeeps and trailers to large mobile cranes, were processed. In addition, all equipment from three camps was decontaminated. Six helicopters, contaminated on aerial surveys, were also decontaminated. At Bikini, approximately 100 vehicles were processed. The majority of the rad-safe surveys of radex areas at both atolls were conducted by helicopter. Normal operations included a pre-entry survey with CTG 7.1 at H + 1 to 3 hr, a detailed survey at H + 6 to 8 hr, and detailed surveys on the morning of D + 1 and 2 days. Additional surveys were made as required. Instruments used in the surveys included special Jordan ionization chambers and standard AN/PDR-39’s converted to read to 500 r/hr. Ground surveys of islands in the atolls were conducted when required. — During the entire Eniwetok operational-phase,the-contamination from _— any one shot did not materially interfere with preparations for the next te high with the exception event. Inall events local contamination was Contamination resulting from camps on Rojoa and Teiteiripucchi be closed up. ‘shots gave significant amounts of alpha (plutonium) contamination on Aomon. , Contamination from Bikini shots was such that Enyu could be used as a base of operations during the entire period. No significant delay in preparations for any shot resulted from contamination found in the atoll area. - 150 =