Tritium Concentrations in Air and in Urine of Workers Resulted from Tritium Handling
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概要
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Tritium content in air and urine of workers was measured during and after the handling of about 30Ci tritium.Tritium content in environmental samples such as air and air-condensed water collected by a cold trap method was determined using a tritium monitor or a liquid scintillation counter. Internal radiation dose was estimated for workers by the analysis of their urine.The tritium concentration in air was about 10-9μCi/cm3 at the beginning of work, whereas the maximum value was observed during the working period as 2.6×10-4μCi/cm3 in hood, 1.3×10-6μCi/cm3 in laboratory and 1.8×10-7μCi/cm3 in corridor. The daily urinary excretion of tritium was represented approximately by a single exponential function with the effective half-lives of 14 days and 12 days for two workers, and their internal radiation dose was estimated as 12 mrem and 7.1 mrem respectively.
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