Abstract
An absolute measurement method for disintegration rates of radioisotopes by 4p beta-gamma coincidence counting systems is described. Absolute activity of 60Co and 99Mo was determined by the counting systems of Japan and Thailand. Radon gas measurement and standardization were also performed. A radon chamber was constructed and employed for the comparative measurements by a pulse-counting ionization chamber and an environmental-level scintillation chamber. The background radon concentration of the radon chamber was also determined.
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