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 measurement of 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 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 guidance for cleanup of 239 Dy in soil at Enewetak Atoll is: a. < 40 pCi/g - corrective action not required. b. 40 to 400 pCi/g - corrective action may be needed. Action to be taken should be determined ona case-by-case basis, c. > 400 pCi/g - corrective action required. In applying the criteria for bone and bone marrow in part l above, it is assumed thet if annual exposures do not exceed the applicable criteria in the year of hichest dose, there will not be a requirement for Iimiting longer term cumulative exposures. Onthe other hand, implementation of the “lowest practicable” concept will require considerations of effectiveness of remeccial measures to rcduce both annual and longer term exposures to the extent practicable. EF. Risk Considerations The Task Group and its technical advisors have reviewed the available information from ICRP, UNSCiAR, and the National Academy of Science BEIR Committee that could be used to HI—11