Abstract
Mice were exposed to neutrons or to mixtures of neutrons and gamma - rays from an atomic detomation and allowed to live out their life span. It was found that neutrons shortened the mean life span by 6.7% per 100 rads, and it was estimated that gamma rays shortened the life span by 2.6% per 100 rads. The relative effectiveness of neutrons for production of this delayed response was 2.6, a value in close agreement with those previously obtained for production of acute effects. (auth)
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