12/17/2023 0 Comments Taongi atoll![]() ![]() We found that the total deposition of 137Cs, external dose, internal organ doses, and cancer risks followed the same geographic pattern with the large population of the southern atolls receiving the lowest doses. Annual doses were estimated for six age groups ranging from newborns to adults. Those estimates along with reported measurements of exposure rates at various times after fallout were used to estimate radiation absorbed doses to the red bone marrow, thyroid gland, stomach wall, and colon wall of atoll residents from both external and internal exposure. Quantitative deposition estimates were made for 63 radionuclides from each test at each atoll. In this work, we estimated deposition densities (kBq m −2) of all important dose-contributing radionuclides at each of the 32 atolls and separate reef islands of the Marshall Islands. From our analysis, we concluded that 20 of the 66 nuclear tests conducted in or near the Marshall Islands resulted in measurable fallout deposition on one or more of the inhabited atolls of the Marshall Islands. Detailed methods and results are presented in a series of companion papers in this volume. This paper summarizes the results of a thorough and systematic reconstruction of radiation doses to that population, by year, age at exposure, and atoll of residence, and the related cancer risks. Nuclear weapons testing conducted at Bikini and Enewetak Atolls during 1946–1958 resulted in exposures of the resident population of the present-day Republic of the Marshall Islands to radioactive fallout.
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