OFFICIAL USE ONLY Enclosure No. 1 Follow-up program of surveillance and study’ of the radiation environment at Bikini (Ref: DOS staff proposal of December 1970) Among the objectives of the program, the following are of immediate concern: (1) Determination of shielding provided by housing under construction. (2) Determination of base-line body burdens of certain radionuclides when people first return. : (3) Determination of actual diet and radionuclide content of same. (This diet is likely to require a supplement tor calcium, which should be provided to minimize exposure to Strontium-90.) (4) Determination of levels of key radionuclides in food crops grown in the atoll. . (5) Determination of daily activities by age and sex. (6) Air sampling under occupancy conditions. (7) Sampling of water supplies (wells and cisterns). (8) Determination of body burdens of key radionuclides as residents come into equilibrium with their diet. There are also requirements with longer range objectives which are alsa important: (1) Study of movement of radionuclides through soils. (2) Monitoring of radiation levels on other island in the atoll presently off limits. (3) (4) Study of radionuclide content of coconuts from trees now heing planted and of pandanus yet to be planted. Study of radionuclide content of preducts obtained from coconuts, the use of these products outside the atoll, and pathways to man for radionuclides in these products. (5) Monitoring of radionuclide content of salt water and sediment in Bikini Lagoon. OFFICIAL USE ONLY