fe eee me : a rs eee em ae This is followed in Section III by a review of the specific radiation protection regulations that are in force in the United States today and which are at issue. This section focuses on the existing guidelines for Pu-239, but it is to be understood that, in this and subsequent sections, it should be applied to all alpha-emitting radionuclides that meet the hot particle criteria developed in this report. Before readins Section III, those unfamiliar with the national ana international organizations which have primary responsibility Zor recommending or establishing radiation protection standards, may find it useful to read Appendix &, where these organizations and their authority are reviewed. : Section IV presents assumptions inherent in the existing Pr inappropriate when applied to insoluble articulates. 'S we o " fe cr f5 cr it rs a gq pP- Ay ° 3 ul i) ‘ fv I~ im cr radiation protection standards and identifies those assump- The biological data which demonstrate that these assumptions are inaporopriate when apvoglied to hot carticles are discussed in Section Vv. Uvilizing the data presented in Section V, the criteria that define a hot particle are developed in Section YI. Recommendations for exposure standards for hot particles are then develoced in Section VII and summarized in Saction VIII.