The only standard directly promulgated by CJTF 132 to all task groups was an MPE of 3.0 R for the entire operation (IPL 132.4.3#1, Annex H). The MPLs used are detailed in the JTF 132 Radiological Safety Report (IPO “LN 132.1TU7#1). All of the radsafe planning documents refer to the3.0-R » ° Miceluisty ' MPE; however, the History of Operation IVY (IPO 132#1) and the Radiological Safety Report (IPO 132.1TU7#1) indicate that the MPE was “| 3.9 R. The date and the reasons for this change have not been determined. The only documentation for the change from 3.0 to 3.9R was ALY bed found in the TG 132.4 History (IPO 132#1, p. 30), stating that the dosage “°° "1% ~ Pledoiia % was “later raised to 3.9 R." The TG 132.4 History cites a JTF TWX "JTF 132 DTG 100615Z (TGAG#TX-1159)" as the authority for the change. , adlmnie The date of the TWX was the tenth month, presumably of 1952. BEST AVAiLAGLE COPY At the time, the two limits were probably believed to represent the same degree of safety. The military regulations on radiological safety in effect then were somewhat ambiguous. The military MPE for whole-body exposure was 0.3 R integrated over a period of a week,* but the level recommended for routine operations was 0.05 R (or less ) per 24-hour period. If routine exposures exceeded 0.3 R/week, the individual was to be removed from further exposure until his total averaged less than the 0.3 R/week. The 0.3-R/week criterion was the same as the AEC criterion for atomic workers. The 0.3-R per week criterion would result in an exposure of 15.6 R per year, or 3.9 R per quarter year. eae * Regulations from NavMed P-1325, "Radiological Safety Regulation," of 1951 are cited here (0.14). 2-35 L—