核退役过程中尿氚的测量和氚生物半衰期的研究

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

用蒸馏和液体闪烁计数法测量了中国工程物理研究院核物理与化学研究所原工作地点核退役过程中直接接触氚和间接接触氚工作者的尿样 ,氚浓度在 1 0 2 ～ 1 0 5Bq/L ,最大氚浓度为 2 .7× 1 0 5Bq/L ,折合剂量当量约为 0 .1 9mSv。短期观测了 2 3名氚生物半衰期 ,其范围为 5.5～ 1 4.8d ,平均值 9.ld ;中期观测了 5名氚生物半衰期 ,其范围为 7.6～ 9.4d ,平均值为 8.5d。观测的共 2 8名工作人员氚生物半衰期与理论值 1 0d接近 ,并且与国内外的观测值符合。

Tritium in urine of tens of the workers in the course of the decommissioning is determined by distillation and liquid scintillation counter,whose concentration 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 observed value.