4 J -6- to a reduction of potential health consequences should have two objectives: (1) To assure that individual exposures are below levels at which there is an unacceptable health risk. It is likely that doses exceeding those recommended as upper limits by FRC, NCRP and ICRP (170 mrem per year) for exposure to population groups will be acceptable for this purpose. (2) To reduce population exposures to as low as practicable. Specific measures to effect such reduction should be based on cost-benefit considerations. Since soil manipulation is likely to be the major method of dose reduction, particular attention will have to be paid to evaluating the environmental consequences and costs of these procedures. Criteria will necessarily depend on detailed radiological survey data for it will be necessary to establish what can be accomplished toward reducing exposures by cleanup actions in reference to costs and to methods for reducing exposures by methods other than cleanup. Instructions and orientation will be given to the returning people on those measures essential to radiological health safety. Provisions will be made to assure that this procedure will cover returnees, early or late, as long as there remain reasons for precautions. Any plans for visits by TTPI health personnel for this purpose may be mentioned.