137 soils and approximately 1.7 times the Cs concentration. A ratio of 9 was 90... and 2394240), found between the u concentrations in the roof wash, indicating that components contains resuspended collected 15 m on of soil the water. surface. A full 239+ 240, the u-_and into the cistern, would increase only by 0.12 and 1.1 contaminates is a could roof If roof was eventually washed particulates continuous £Ci/l, process also be cistern 90, at respectively. the year the building deposited the concentrations over among. on 10 the in the water If resuspension of and the amounts of radionuclides deposited on the roof of building 10 over the 2-wk interval are representative of the amounts accumulated during any 2-wk interval, 90... annual amount concentration of in accumulated a full insignificant compared deposition. Unlike concentrations 137 of cistern to only present the Cs by ratio. and 28 global of drained would fCi/l. This fallout 905, in cistern water exceeds increase’ 137605 the the concentration levels to then the in in annual soils, is wet the levels of 905, Some contamination results from resuspension, but the amounts are not sufficiently large to account for the changes in concentration detected in the water since 1975. Radionuclide concentrations in the cistern water during each sampling period at Bikini are averaged and summarized in Table 7. By November of 1977 90. 13706 and 2394240,| the average concentrations of had to approximately 19% of the concentrations measured in 1975. occurred in the 13766 and chloride were deposition. nearly After concentration. equivalent 1977, the Also, to mean the fallout decreased A similar change concentrations levels concentrations of of 905, expected in wet 1376, 90,.. and increased while the concentrations of Pu slightly declined. The changes moved the change that in concentrations o.curred back to Bikini amount satisfied stored normal in at Island. of average the 13706 Atoll. By requirements. previously concentration of closely 1975, paralleled fewer There was no large demand the cistern attached between 1975 and 1978. many Bikini of A large to individual increase in than 60 the social people had for fresh water and residences probably population occurred The need for fresh water increased and inventories in unused cisterns radionuclides were used. in the water During this period, decreased the significantly. In September 19/78 all the Bikini residents were removed from the island by the Trust Territory Government. The average 12 concentrations of 1376, and 90.Sr