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Because of the inherent difficulties in the lowlevel assays of large numbers of bulk samples and the un ertainties in estimating total body burden from excretion levels, a facility for determining gamma-ray activity directly in humans was constructed during 1957 at the Walter Reed Army Institute of Research. This facility includes a large NaI crystal gamma-ray spectrometer and a 4-pi liquid scintillation counter. This location was selected because of population density, and a large hospital complex ensured the use of the facility in clinical medicine and metabolic research. The experiences and techniques of whole body counting are described. (Author).
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