consumed outdoors during passage of the fallout cloud. The adult mean thyroid absorbed doses at Rongelap and Utirik were 13 and 1.7 grays respectively. The child mean thyroid absorbed doses were 40 grays at Rongelap and 4.9 grays at Utirik. The overall mean cancer risk in the exposed population of 251 people was 1.1 thyroid cancers per 10,000 people per gray per year. risk for cancer was 18 years. The mean time at The overall mean nodule risk was 8.4 nodules per 10,000 people per gray per year and the mean time at risk for nodules was also 18 years.