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白行研制了一套3H和14C联合取样装置。对3H,取样一周,取样溶液约1mL,用液体闪烁计数器进行测量,本底计数率约为0.85s-1,测量时间为300s,探测下限约为33Bq/m3,总相对不确定度约为12％:对14C,将样品制成CaCO3,取2g样品,用液体闪烁计数器进行测量,本底计数率约为1.3s-1,测量时间为 300s,探测下限约为0.6 Bq/m3,总相对不确定度约为13％。对国内某重水研究堆烟囱排出气态物流中的3H和14C浓度进行了5次测量。结
White line developed a 3H and 14C joint sampling device. For 3H, the sampling period is about 1mL, the sample solution is about 1mL, the liquid scintillation counter is used for the measurement, the background counting rate is about 0.85s-1, the measuring time is 300s, the detection lower limit is about 33Bq / m3 and the total relative uncertainty is about 12 %: 14C, the sample made of CaCO3, take 2g samples, measured by a liquid scintillation counter, the background count rate of about 1.3s-1, the measurement time is 300s, the detection limit of about 0.6 Bq / m3, the total relative is not The degree of certainty is about 13%. Five measurements of 3H and 14C concentrations in the gaseous effluent from a domestic research reactor stack were carried out. Knot