In these evaluations, it should be emphasized that dosages through various pathways are estinated on the Dvasis of environmental data and considerations of expected living patterns and dietary habits. ‘hile "radiation standards" do not exist for environmental conta:ination levels in substances sucii as soil and foodstuffs, there is general agreement in terms of conservative stofels of these pathiavs and cle relavionships betveen a certain level in the environment and the likely dose to result from the pathway exposure. The area of plutonium in soils, however, is one for which there is no general agreement as to the quantitative relationship between levels in soils and dosages to be expected through the inhalation pathway, the primary one through which man can receive a sisnificant dose fron plutonium. The ICRP recomenis a maxinun vermissible average concentration (PC) of 1 picocurie per cubic meter (pCi/m3) of air for "insoluble" plutonium and 0.06 pCi/n? for "soluble" plutonium for unrestricted areas. “hile the plutonium in the soil at Enewetak is thought to be typical of world-ide fallout, and therefore insoluble, 9.96 nCi/m? will be used for the sake of conservatism. Appendix A of Inewetak Radiolovical Survev, 1VO-140, presents two possible metnods for deriving the exposures that may occur turough the inhalation pathway for plutonium in soil. (This is the pathway of interest for the reteitly present although it is zeereanteed that for the very distant future, ingestion may become nore important by comparison, Table 250 of Appendix TI shows that exposure to bone, liver, and lung from 239?u are expected to pe a fev hundredths of a ram in 3) vears for vatihways other than innalation.) This material is sroducel as Attachinent T of this section 111-10