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. 40). The Commander, TG 7.1, soon realized the deteriorating situation and decided to relieve any TG 7.1 or TG 7.5 individuals exceeding 6.0 R of duty and return them to the United States. This policy greatly assisted 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 forward shot area (Reference 22, Appendix B). All personnel working at Bi- kini were evacuated from the atoll before each shot detonation firing party).* (except for the BRAVO The ships, with evacuees, were stationed out- side of the anticipated fallout area. All islands near the shot point were considered too contaminated for reentry until cleared by a radsafe survey. RADSAFE INSTRUMENTATION. The standard radsafe survey meter used by TU 7 was the AN/PDR-39 ion chamber.* Other instruments in use included 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 consisting of various models of the AN/PDR-27, the Beckman MX~-5, and the Nu- clear Corporation 2610 (Reference 17, p. 42). * For the NECTAR shot on Enewetak, no evacuation was necessary. The device was not detonated until it was determined that fallout radiation would not contaminate the inhabited islands of the atoll. t the Navy's Bureau of Ships was responsible for procuring and distributing sufficient radiac equipment for all elements of TG 7.3 to have a full complement. A complete accounting of the types and numbers of tradiac instruments employed by TG 7.3 has not been found. Evidently, neither the AN/PDR-39 instrument nor the similar AN/PDR-T1B was issued (Reference ll, p. 118-1). The primary instrument for TG 7.3 was the AN/PDR-27F, with the AN/PDR-18A available for use in higher radiation fields (Reference ll, p. 115). 100 le