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Cumulative 131I ground deposition density (MBq m−2) in the northern part of Ukraine where the cohort members resided at the time of the accident (map in the upper left part of the Figure) and distribution of the cohort members over the eight most contaminated raions of Kyiv, Zhytomyr and Chernihiv Oblasts. At the time of the accident, 150 members of the cohort resided outside those eight raions.
