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J Radiat Res. 1991 Mar;32 Suppl:154-61.

The LD50 associated with exposure to the atomic bombing of Hiroshima and Nagasaki.

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Department of Statistics, Radiation Effects Research Foundation, Hiroshima, Japan.


Numerous attempts have been made to estimate the distance at which 50% of the individuals exposed to the A-bombing of Hiroshima and Nagasaki died, ostensibly from their exposure to ionizing radiation. It is difficult to convert most of these distance estimates to a dose-related LD50, since radiation shielding was ignored. The recent reassessment of the atomic bomb radiation dosimetry has provided an opportunity for the estimation of the bone marrow LD50. There is a surprising concordance in the various estimates that have been made given the different groups of survivors involved and the methods used to estimate the LD50/60.

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