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Thyroid doses from intake of radioiodine isotopes (¹³¹I, ¹³²Te+¹³²I, and ¹³³I) and associated uncertainties were revised for the 13,204 Ukrainian-American cohort members exposed in childhood and adolescence to fallout from the Chornobyl nuclear power plant accident. The main changes related to the revision of the ¹³¹I thyroid activity measured in cohort members, the use of thyroid-mass values specific to the Ukrainian population, and the revision of the ¹³¹I ground deposition densities in Ukraine. Uncertainties in doses were assessed considering shared and unshared errors in the parameters of the dosimetry model. Using a Monte-Carlo simulation procedure, 1,000 individual stochastic thyroid doses were calculated for each cohort member. The arithmetic mean of thyroid doses from intake of ¹³¹I, ¹³²Te+¹³²I, and ¹³³I for the entire cohort was 0.60 Gy (median = 0.22 Gy). For 9,474 subjects (71.6% of the …