Abstract
The ratio of the mean bone-marrow dose to in-air tissue absorbed dose for survivers in Hiroshima and Nagasaki has been calculated with the aid of the Synder mathematical phantom, using depth dose curves in phantom. From this ratio, the mean bone-marrow dose has been estimated as a function of distance from the hypocenter. The ratios were corrected for the angular distribution of atomic bomb radiations. The resultant ratios are tabulated as a function of incident angles on an adult and a child (3-7 years old) survivor for gamma-rays and neutrons. As an example of the resultant mean bone-marrow dose, the adult survivors who were standing straight in open field at 1000 m from the Hiroshima hypocenter have been estimated to be exposed to 165 rads of initial gammarays, 32 rads of recoil protons, 14 rads of gamma-rays from 1H(n, γ)2D reaction and 0.9 rads of protons from 14N(n, p)14C reaction.
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