SLIDE 38 Field surveys. ,goartipg in May 3358, Conard and Cohn (Co59), measured wholebody levels of Cs, Zn, and “Co in about 100 Rongelap adults, adolescents and juveniles as part of the Brookhaven medical examination program. A shipborne portable whole-body counter with a standard chair geometry in a shielded steel room was employed (Co63). Whole-body counts were obtained in the Rongelap and Utirik populations in 1959 (C060), 1961 (C062), 1965 (C067), 1974 (Co75) and 1977 (Co80a). The counting geometry was converted to a scanning type shadow-shield geometry starting in 1965 (Co67). From 1978 to the present time, whole~body counting measurements were performed with the bed-type shadow shield whole-body counter (Co67). In 1980, a standard chair geometry was once again used. All three counting systems were intercalibrated and also calibrated against the large 54-detector wholebody counter at BNL. Three body burden measurements of the Bikini Island population were conducted from 1974 to 1978 at Bikini Island. In 1980, 1981, 1982, and 1983, whole-body counting of the Enewetak population occurred. Whole-body counting in the field was done from a ship located in the lagoon of the atoll and people were taken to and from shore by small boat. 41