Survey, Cleanup, and Rehabilitation Evaluation It isrecommeadgedin this context that: 1. The FRC Radiation Protection Guide (RPG's) for individuals should be used as the basic standard. The requirement is to assure that exposures for continuous residence in Enewetak Atoll will be well within the annual and 30-year criterion. While these are conservative standards from a health view point, there is no built-in conservatism to account for uncertainty in prediction of annual exposures to individuals. Because of the complex circumstances of exposure and the many pathways, each with its uncertainty, the Task Group recommends use of 50 percent of the FRC annual standards for evaluation of the many cleanup and rehabilitation alternatives at Enewetak Atoll. This is not to be viewed as an attempt to establish new standards but is considered to be a necessary precaution in the application of current standards. The following valmes apply ‘for evaluation of alternatives: Whole body ...e-ee ee escneccceceee0. 25 Rem/yr Bone marrow eeooesescscccccecesee 0. 25 Rem/yr Bone... scccccccccesccccccccerces OF 75 Rem/yr Thyroid ...cccecenccccncccsscceee 0. 75 Rem/yr BEST AVAILABLE COPY Ze The Task Group recommends use of 100 percent of the FRC RPG's to evaluate post-cleanup and rehabilitation and postreturn conditions wherein direct measurementof levels of radiation and radioactivity in foods and in people are made. Under such conditions, dose estimates should be subject to much less uncertainty. The requirement is to assure that exposures are well within the FRC standards. See Section A. of this Appendix for the FRC RPG's. The criteria for evaluating gonadal exposures at Enewetak eee ss Atoll should be 4 rems in 30 years. The requirement is to assure that long-term exposures will be well within this criteria. The Task Group feels justified in using 80 percent rather than 50 percent of the FRC standard since there will be ample time to verify exposure estimates using actual” sampling of the diet and time to follow the changing pattern _ of exposures of people. The recommended Putin soil at Enewetak a. <40 pCi/g - corrective action not required. b. 40 to 400 pCi/p - corrective action may be needed. Action to be taken should be determined on a case-by-case basis. = c. > 400 pCi/g - corrective action required. Ate ee ee ee |