ATOMIC ENERGY COMMISSION RADIOLOGICAL SAFETY CRITERIA FOR THE NEVADA TEST SITE Report to the General Manager by the Director of Biology and Medicine THE PROBLEM 1, To establish radiological safety criteria for exposures to gamma radiation from fallout to populations around the Nevada Test Site, SUMMARY 2, The trend in thinking of the International Commission on Radiation Protection, the National Committee on Radiation Protection, and the National Academy of Sclerce is toward more restrictive criteria for standards of radiation protection, 3. In light of the above, it is recommended thet radiological safety criteria for exposures to gamma radiation from fallout to populations around the Nevada Test Site should be as follows: a. The current crlterion of 3.9 roentgens for any one year; plus an additional restriction of b. 10 roentgens in a period of 10 years, with the first of the successive ten-year periods starting in the spring of 1951, 4, These should be construed to be operational guides rather than maximum permissible limits, since exposures somewhat in excess would not be hazardous. STAPF JUDGMENTS 5. The Divisions of Military Application, Information Services, Office of the General Counsel and the Office of Classification conour in the recommendation of this paper. -1.-

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