Abstract
A description is given of the design and performance of a whole-body counter at the University of Tokyo. The apparatus is intended for use in medical research and as control measure for radiation protection. Three types of detectors are installed for whole body counting of the human subject: (a) 5″ Nal(Tl) scintillation probe, (b) 2.5″ Nal(Tl) scintillation probes, and (c) large plastic scintillation probes. Output signals from the detectors are analyzed in a 400-channel pulse height analyzer. The subject is measured either on: (a) stretcher, (b) chair, or (c) V-bottom bed. In using the plastic scintillation probes, counting for a period of 15 min suffices to detect 150 g of potassium in the body, allowing for a statistical counting error of 2.2%. Spectra from some human subjects are presented.
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