微量热计测量低活度氚

针对国际热核聚变实验堆氚增殖系统(ITER-TBS)中微量氚活度的绝对测量需求,设计研制了微量热计。采用固体含氚样品对微量热计的输出热电势(Eout)-输入热功率(P)进行标定,Eout-P关系式具有很好的线性关系,灵敏度系数达到0.13V/W。研制的微量热计最低检测限低于0.2μW,量热杯体积大于500mL,该性能指标预期可定量测量ITER-TBS系统中各种复杂形态的微量氚活度,具有很好的应用前景。

Absolute Measurement of Micro-Calorimeter for Low Activity Tritium

For the absolute measurement requirement of trace tritium activity in ITER-TBS system,a micro-calorimeter was designed.The solid tritiated samples were used to demar-cate the output thermal potential(Eout )and the input thermal power(P).The results show a good linear relationship between Eout and P,and the sensitivity coefficient reaching 0. 13 V/W. The minimum detection limit of micro thermal meter is below 0. 2μW,and the calorimetric cup volume is more than 500 mL.The performance is expected to have a good application prospect for quantitative measurement of the trace tritium activity under various complicated situation in ITER-TBS system.