The potential health hazard via the The island of YVONNE presents a unique hazard on Enewetak Atoll. Pure plu- inhalation pathway is sufficiently great tonium particles are present on or closeto to dictate two basic alternatives for the ground surface, randomly scattered in remedial action for this island: (1) Make "hot spots” over most of the area fromthe the entire island an exclusion area — off tower to CACTUS crater. Examination of limits to all people, or (2) conduct a these hot spots'' has revealed the presence cleanup campaign which will eliminate of occasional milligram-size pieces of plu- the "hot-spot" plutonium problem and tonium metal, remove whatever amount of soil is as well as smaller pieces which are physically indistinguishable in necessary to reduce the soil plutonium size from the surrounding coral matrix. concentration to a level cpmparable to Giventhese current conditions, it must be other northern islands. assumed that pure plutonium particles of of the volumes of soil involved, removal respirable size are now also present onthe of a 10-cm-thick layer of topsoil in the surface or may be present in the future as area in which "hot spots" have been weathering effects oxidize and break down detected involves approximately 17,000 the larger particles. Lung dose assess- m°? of-material. ments for this area, therefore, to reduce the maximum plutonium con- must be As an indication Further removal of soil based on inhalation of pure plutonium tamination levels to 50 pCi/g or less particles rather than those having the av- involves an additional 25,000 m? of erage plutonium content of the soil. material, Table 242, Relative contributions of terrestrial foods to the integral dose assuming . diet at time of return, Percentage of total 5-yr Food item A. Island group 905, dose to bone Slag dose whole body 90, dose to bone Sia dose whole body ALICE-IRENE Domestic meat 43.9 46.9 Pandanus fruit 26. 8 24,7 Breadfruit 23.1 21.1 Wild birds 98.9 100 <0. 08 0,29 0. 04 <0. 008 0.11 0. 004 Arrowroot 1.3 0. 20 Coconut meat 3.9 6.2 0.57 0. 93 Bird eggs - 0.65 0. 24 “Coconut milk B. Percentage of total 10-vr Island group BELLE Domestic meat 100 100 44.2 47.1 Pandanus fruit 27. 0 24.6 Breadfruit 23,2 21,1 Arrowroot L.4 0. 20 Coconut meat 3.9 .2 Coconut milk 0.58 II-61 0. 92