Agams, MU. 1A ordertu uecermine tne total number UT peopie dria effects since the time of exposure, March 1954. Table One. ule tutal Cuyruiu These data are given also in The data include the most recent thyroid nodules detected in the exposed population. Dr. Adams and I estimated the excess cases of nodules and thyroid cancer based on Robert Conard's twenty-six year report (Co80). However, thyroid cancer and nodule data from the Marshallese comparison populations are being thoroughly re-examined by us due to possible low-level exposure of some of these people from the testing program. The average time at risk per irradiated subject was assumed to be the time from radiation exposure on March 1-3, 1954 to time of surgery. One person in the Utirik exposed population was assumed not to be an excess thyroid cancer, Debate continues and a clear distinction of either carcinoma or adenoma for this individual may never be resolved. One implication of the dose reassessment was that the thyroid dose to each population (see Table One) was from different relative amounts of external and internal radiation. Also, the internal radiation dose rete was different for each atoll population due to differences in nuclide conposition as a function of fallout age. The greatest portion of thyroid ahsorbed dose was reassessed to be from the shorter lived iodine isotopes 1-133 and I-135 and not from I-131.