The clean-up phase of the rehabilitation of Bikini Atoll was begun in February, 1969, by Joint nask Force Eight. The AEC Nevada Operations Office is responsible for certification of the clean-up portion of the rehabilitation program, which was carried out under guidelines approved by the AEC Division of Operational Safety. At the request of NVOO, the U. S. Public Health Service took the responsibility for external radiation measurements, and for the collection and analysis of those land plants which are food items; the U of W Laboratory of Radiation Ecology was asked to sample and analyze other biological and environmental samples. This report presents the results of the Laboratory's analyses. SELECTION OF SAMPLES AND SAMPLING SITES The sampling program was based on the objective of obtaining data for evaluation of potential radiological hazards to man. The samples were limited, for the most part, to things which might be eaten by returning Bikinians, except for land plants. GLE100S Some additional samples, for example soils, crater sediments and ground water, were taken to provide data for estimating the future o®g! ntn’sof OfEnfier meia ator virt nuclides in the biota. Depa tion and amounts of radio Gistribu The fish collected are in two main categories: ' fish and the pelagic, or "troll-caught" fish. ARCHIVES the reef. The reef fishes are usually collected by throw nets by the Marshallese and are