,. transuranic elerner?t ~/ cleanup criteria for the island of Enjebi, for example, which would eventually allow it to be used as a residence island (once suburanic elements ~/ no longer pose a health hazard}, about”50 percent more soil would have to be excised using the more conservative philosophy. --The Enewetak Radiological Survey dose assessments were based on averages for islands and groups of islands. Now dose assessments require consideration of the worst region on each island. This leads to higher radiation dose estimates. . =-During 1977 the Environmental Protection Agency (EPA) published proposed guidelines for dose limits for perscns exposed to transuranic elements in the environment which are much more stringent than those recommended by the Atomic Energy Commission Task Group on Recommendations for Cleanup and Rehabilitation of Enewetak Atoll. The radiological cleanup criteria have been made.more stringent in an effort to meet the proposed EPA guidelines. --The Task Group’s radiological cleanup guidelines considered onl;’plutonium-239 and plutoniu!’-24O. The cleanup guidelines were broadened to include all transuranic elements. The greatest danger from plutonium-239 and plutonium-240 was calculated to-be from inhalation and which was relatively small in comparison to all other dose pathways. The inhalation and ingestion pathways become more significant when considering additional transuranic elements and the more stringent EPA guidelines. --The cleanup emphasis shifted from excising plutonium from islands originally programmed for agriculture or food gathering purposes immediately after cleanup to excising transuranic elements from islands which can be used for additional purposes sometime in the future when suburanic elements no longer pose a health Inherent in this philosophy change is that hazard. additional islands may have to be indefinitely quarantined because resource and time constraints may not permit cleaning them up. ● ~/ Transuranic elements are those having atomic numbers greater than that of uranium. ~/ Suburanic elements are those having ato~ic numbers less than that Of uranium. ’13 “ .