Measurement of Tritium in Urine and Study on Half-time of Tritium Excretion of Men

Tritium in urine of tens of the workers in the course of the decommissioning is determinated by distillation and liquid scintillation counter, whose cncentration are 10 2～10 5 Bq/L and whose maximum concentration is 2.7×10 5 Bq/L, which is dose equivalent 0.19 mSv by counted. The half time of tritium excretion of 23 workers are 5.5～14.8 d and the average value is 9.1 d in short time. The half time of tritium excretion of 5 workers are 7.6～9.4 d and the average value is 8.5 d in middle time. The half time of 28 workers in the work not only comes near to theoretical value 10 d, but also fully tallys with internal and external observated value.