The propagation of environmental gamma rays through the human body was calculated using the 3-dimensional Monte-Carlo code DISDOS. These calculations were performed with the aim of determining the gonadal dose with a statistical accuracy of 10% or less for each of the energies considered. The ratio of exposure to absorbed dose in the human body averages about 0.6. A mean annual gonadal dose produced by environmental gamma rays in the U.S. was calculated to be 32 ± 4% mrad/yr. The mean annual dose to the red marrow was calculated to be 29 ± 0.1 % mrad/yr (the errors cited being purely statistical).
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O’Brien et al. (1976) studied this question.