30 the concentration of seven gamma-emitting radionuclides in "mid-lagoon" and Bravo Crater sediments collected in August, 1964. Beck et al. (1967) reported roncentrations of three gamma-emitting radionuclides in Bravo Crater sedi- ments taken in May, 1967. Held (1971) reported 20735 and plutonium concentra- tions in a Bravo Crater sediment collected in 1969. The concentrations of selected radionuclides reported in these reports are shown in Table 2. Held's vor). also noted the presence of a large variation in the ratio of 2394240 Pu/ 23e in Bikini soils, with ratios of 15:1 in Bravo Crater sediment, 2:1 in fneran Island soils and very high ratios in Bikini Island soils, due to undetectable 2385, levels, “although they contained the highest concentrations of 039+2405 of th> samples analyzed." TALE 2, Concentrations of radionuclides reported in various Bikini Lagocn sediments. Location pCi/a, dry, at date of collection Mid-lagoon Rate Co 19648 3.2 - 10 eee cs 1964° 100 - 390 0 - 2.1 0 - 0.15 PT Bi 230-3302 28-170 0.29 - 1.4 ohy 0 - o: vu 110 - 250 . é. helander (1967); n=2 . Bravo Crater 19675 49.7 14.8 26.1 - . b. Beck et al (1967) 1963¢ - - 56.8 - 53.5 60. 4.0 cc. Held (1971) he's (unputliched results) measured the distribution of gross beta radioa se wows 7 “YT ‘* sections of ten sediment cores taken from Rongelap Atoll in 1959. te" tye cor-s, the gross beta radioactivity decreased from values ranging ~ s o 8 . ‘c lle e/r/g, dry, in the surface one inch of sediment, to values «Be %e “ston, Or to 2.9 c/m/g or less, in the 4-5 cm section. Three of - Ciret Ge had“ one value higher than 2.9 c/m/g in a section deeper in the . "er nt ‘erved radioactivity oricinated from the local fallout of the