Studies of the Mortality of A-Bomb Survivors: 2. Mortality in Selections I and II, 1950-1959

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Abstract
In this 2nd report on the joint NIN-ABCC mortality study, the 7303 deaths among 90,000 individuals during 1950-1959 are analysed for evidence of radiation effects. Total mortality rates for the exposed sample essentially agree with those of Japan, and do not vary with presumptive radiation dose. Mortality from leukemia reflects accurately the previously well-established relation between leukemia and radiation dose in A-bomb survivors. Mortality from other malignant neoplasms is moderately but definitely higher in Hiroshima females, because of increased frequencies of cancer of the stomach and uterus. No effect is seen in Hiroshima males or in either sex in Nagasaki. The effect is unrelated to the history of acute radiation symptoms. These results differ in major ways from those reported from the Hiroshima Tumor Registry. There is suggestive evidence that the youngest of the survivors, aged 0 to 4 in 1945, experienced excessive mortality in the 1950-1959 period.