Abstract
White Swiss mice were exposed to single, graded doses of x rays of thermal column radiation (thermal neutrons plus gamma rays) and allowed to live their life span. Mean life span was calculated for each group, and per cent life shortening as a function of dose was determined. Under the conditions of the experiment, life shortening amounted to about 5% per 100 rads for either type of radiation. The relative biological effectiveness (RBE) of thermal column radiation for shortening life span was 1.00 plus or minus 0.24, a value not significantly different from the RBE for the production of 30-day death. (auth)
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