waivers granted were not utilized. For TG 7.5, 14.2 percent exceeded the MPE, with less than 3 percent covered by waivers (Reference 17, p. §0). The Commander, TG 7.1, soon realized the deteriorating situatiog and decided to relieve any TG 7.1 or TG 7.5 individuals exceeding 6.0 RJof duty and return them to the United States. This policy greatly ass4sted the Control Group in minimizing personnel exposures. Radsafe Monitoring and Instrumentation The overall radiation protection plan was based on the premise that Enewetak Atoll was the primary base of operation and Bikini was the ward shot area (Reference 22, Appendix B). fFor- All personnel working at kini were evacuated from the atoll before each shot (except for the detonation firing party).* The ships, with evacuees, were stationedfout- side of the anticipated fallout area. All islands near the shot point were considered too contaminated for reentry until cleared by a radsdafe survey. RADSAFE INSTRUMENTATION. The standard radsafe survey meter used TU 7 was the AN/PDR-39 ion chamber.* by Other instruments in use includgd the AN/PDR T1B and the AN/PDR-18A or -18B ion chamber, for survey in highly contaminated areas, and lower range Geiger-Mueller type instruments c@nsisting of various models of the AN/PDR-27, the Beckman MX-5, and the[Nuclear Corporation 2610 (Reference 17, p. 42). * For the NECTAR shot on Enewetak, no evacuation was necessary. The vice was not detonated until it was determined that fallout radiati would not contaminate the inhabited islands of the atoll. T The Navy's Bureau of Ships was responsible for procuring and distrib ting sufficient radiac equipment for all elements of TG 7.3 to have full complement. A complete accounting of the types and numbers of radiac instruments employed by TG 7.3 has not been found. Evidently neither the AN/PDR-39 instrument nor the similar AN/PDR~T1B was issu (Reference ll, p. 11B-1). The primary instrument for TG 7.3 was the AN/PDR-27F, with the AN/PDR-18A available for use in higher radiatio fields (Reference ll, p. 115). 100