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针对ITER-TBS涉氚系统中微量氚活度的定量测量的需求,本工作设计研制了等温双杯微量热计(图1)。通过半导体热电偶的合理选型、量热杯结构优化设计、热源和冷源的结合处理、真空恒温等一系列措施,解决了热控制关键技术。采用电功率以及固体含氚样品对微量热计的输出热电势E和输入热功率P进行标定,二者具有很好的线性关系,灵敏度系数达到0.13μV/μW。对2 850 mCi含氚样品,5次测量重复性偏差为30 mCi,相对标准偏差为1.05%,如图2所示。研制的微量热计最低检测限低于0.2μW,量热杯体
In order to meet the demand of quantitative measurement of trace tritium activity in ITER-TBS tritium-bearing system, an isothermal double-cup microcalorimeter was designed and developed in this work (Figure 1). The key technologies of thermal control are solved through the reasonable selection of semiconductor thermocouple, optimization of the structure of the calorifier cup, the combination of heat source and cold source, vacuum thermostat and a series of measures. The output thermoelectric power E and the input thermal power P of the microcalorimeter were calibrated using electric power and solid tritium-containing samples. The calibration results showed that the two methods had good linearity and the sensitivity coefficient reached 0.13μV / μW. For 2 850 mCi samples containing tritium, the repeatability of 5 measurements was 30 mCi and the relative standard deviation was 1.05%, as shown in Figure 2. Developed the lowest limit of detection of calorimeter less than 0.2μW, calorimetric cup