Abstract
Abstract Analytical transport theory was used to investigate the procedures for converting free-air exposure measurements to absorbed doses in the reproductive organs of populations exposed to various natural and fallout environmental radiation fields. Calculated air-overground environmental gamma-ray spectra for uniformly distributed 238U, 232Th, and 40K, and 137Cs plane and exponentially distributed sources in the soil are the inputs for the gamma-ray transport calculations in tissue slabs. Corrections are made to account for the finite width and surface curvature of the body. Anatomical drawings of actual body cross sections, showing the amount of overlying tissue and bone, are then used with these results to obtain gonadal absorbed dose estimates for uniform exposure around the body. Though the results indicate that a single screening factor is valid for various environmental fields, more satisfactory gonadal dose estimates would be obtained if the 0.6 screening factor recommended in 1962 by the United Nations Scientific Committee on the Effects of Atomic Radiation were revised to 0.8. Independent experimental measurements with a realistic man phantom support these conclusions.
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