内标淬灭校正法测定尿中氚浓度

氚引起的内照射对人体伤害非常大，因此评估涉氚人员的氚内照射水平十分重要。为满足快速准确评估人员氚摄入水平的要求，本研究在原尿直接测量法的基础上，采用内标淬灭校正法，对三名涉氚工作人员尿液中的氚放射性浓度进行测量，评定测量结果的不确定度，并估算该方法的探测下限。测量结果表明，李、胡、黄三位工人的尿中氚的放射性浓度分别为94.9、554、898 Bq/L，与氧化蒸馏法测量结果的偏差均在4%以内。该方法操作简便、快捷，准确性较高，可以满足涉氚工作人员的尿氚监测和内照射剂量快速准确评价的要求。

Determination of Tritium Concentration in Urine by Internal Standard Quenching Correction Method

The internal irradiation caused by tritium is very harmful to human body, so it is very important to evaluate the level of tritium internal irradiation of related workers. The measurement of urine tritium is a common method to evaluate tritium intake and internal radiation dose of radiation workers. In order to meet the requirements of rapid and accurate assessment of tritium intake level of related workers, based on the direct measurement method of original urine, in this paper, the activity concentration of tritium in urine of three tritium related workers was measured by internal standard quenching correction method. And also evaluate the uncertainty of the measurement results, and estimate the lower detection limit of this method. Through the measurement, the activity concentrations of tritium in urine of Li, Hu and Huang workers were 94.9, 554 and 898 Bq/L respectively, and the deviation from the measurement results of oxidative distillation method was within 4%. The results show that this method is simple, fast and accurate, and it can meet the requirements of urine tritium monitoring and rapid and accurate evaluation of internal irradiation dose of tritium workers.