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Putting on the base of previously reported data on life-span shortening in irradiated mammals, life-span shortenings were estimated in man exposed with the dose rate of 5 R/year calculated from the present maximum permissible dose during 18 to 60 years old and with the dose rate of 0.2 R/day during 20 to 60 years old. The calculated values of life-span shortening were nil to 4, 070 day at 60 years old in man exposed with 0.2 R/day and nil to 1, 690 days in man exposed with 5 R/year. The possibility of life-span shortening in man exposed with the present maximum permssible dose could not be denied by the present estimation. The calculated results that radio-sensitivity responsible to life-span shortening was depending on the age, suggested that the age to start radiation works had better to be limited more than 25 years old under the condition to end radiation works at 60 years old.

Estimation of Life-Span Shortening in Man Exposed With Maximum Permissible Dose of Ionizing Radiation