-3- ' The measurement of body radiation by such analysis is very sensitive and requires complex electronic equipment and personnel highly trained in electronics ~ from Brookhaven National Laboratory, 3. Personnel exposure to gamma radiation: Gamma levels on the island were derived from data furnished by other radiological survey groups. MONITORING DATA The results of the personnel monitoring data on people living at Bikini The data on urine since 1969 are presented in the accompanying tables. analyses are presented on Table I. Note that average pci/liter for Bikini urine compared with Rongelap was for 905. 2.5/3.8 and for 13765 6338/3360. Based on standard guide lines (International Congress of Radiation Protection ~ ICRP) these isotopes have been well below maximum permissible levels. assuring also is the virtual absence of plutonium in the samples. Re- Levels for internally absorbed 13765 as measured by spectrographic analyses are presented in Table 2. Note the average values for males and females on Bikini compared with those on Rengelap (in nCi/pg body weight) was 1.4/6.4, again well below the maximum permissible levels. The graphs in figures 1 cud 2 show that body burden (extrapolated) for 905. and 137 Cs in the Bikint people are well belowthe peak values noted in the Rongelap people. The Rongelap people reached a peak of 6-11% of the maximum 90.7 permissible level (for general populations) and of about 22% for 13765. These low values for internally absorbed radionuclides is in accord with the fact that the people on Bikini have been subsisting mainly on imported foods. The contribution of gamma radiation to the people on Bikini is somewhat greater than on Rongelap. 10 mee rsSmaeerern tee, = Do, . Pee gt * . vara : CO a ray 8 ee tage , ‘h oy ” “ moe ate tt Se te snp eer te ne