DATA BASES The exposure pathways for persons resettling Enewetak Atoll consist of two major categories: (1) external exposure and (2) internal exposure. The specific pathways in each of these categories are: (1) External Exposure a. Natural background b. Man-made gemme and beta (2) Internal Exposure a. Radionuclides in terrestrial foods b. Radionuclides in marine foods c. Radionuclides in drinking water d. Radionuclides inholed The natural background et the atoll is 3.5 results primarily from cosmic radiation. 4 per hour and The natural background is not included in the doses presented in this paper. External Exposure - In Situ Measurements External exposure rates for 137 Cs and 6965, as well as the surface (0 to 3 cm) concentration values for 24] Am, were obtained from in situ measurements performed by EG&G, Inc., as part of the Enewetak Cleanup Project and can be found in Reference 2. A draft copy of the detailed description of the systems and procedures employed in the in situ measurements is included with this report (Appendix A). These measurements were obtained utilizing a planar, high purity, germanium M501 1683