standard that X-ray installations (medical andnon-medical), power in-~ stallations, disposal of radioactive wastes, experimental installations, testing of weapons, and all other humanly controllable sources of radiations be so restricted that members of our general population shall not receive from such sources an average of more than 10 . .: | roentgens, in addition to background, of ionizing radiation as a total accumulated dose to the reproductive cells from conception to age 30.—- n-—-That individual persons not receive more than a total accumulated dose to the reproductive cells of 50 roentgens up to age 30 years -—— and not moive than 50 roentgens additional up to age 40 -——" The National Committee on Radiation Protection and Measurement?’ has recommended that, "The maximum permissible dose to the gonads for the population of the United States as a whole from all sources of radiation, including medical and other man-made sources, and background, shall not exceed 14 million rems per million of popnulation over the period from conception up to age 30, and one-third that amount in each decade thereafter. Averaging should be done for the population group in which crosc-breeding may be expected.u2/ Since natural background radiation is roughly four roentgens per 30 years, the value for man-made sources becomes about 10 million man-rems for a population of one million. This particular unit was selected because of genetic considerations, i.e., radiation doses to relatively large populations. The average exposure to only those communities around the Nevada Test Site that experienced the greatest amount of fallout (0.2 roentgens or more) is 0.6 roentgens for the six awe ~ 32 -