基于BIXS方法的高浓度气态氚探测器设计

Design of High-concentration Gas Tritium Detector Based on BIXS Method

近年来,氚的监测在确保反应堆的安全运行、工作人员的健康安全有着重要作用,特别是对以氚为核燃料的聚变反应堆。基于β射线诱发的韧致辐射X射线谱仪(BIXS)由于记忆性效应低、探测器尺寸小已逐渐成为国内外研究的热点。利用蒙特卡洛方法(MCNP)对BIXS探测器的尺寸以及材料进行了优化设计。结果表明,在0.5 MPa的工作压力下,铍窗厚度为0.1 mm、铍窗镀金层厚度为125 nm的小型BIXS测量系统可实现氚气的在线测量和探测器的小型化,其中100 s探测限为1.79×108Bq。

In recent years,tritium monitoring has played an important role in ensuring the health and safety of workers during reactor operation,especially for fusion reactors that require tritium as nuclear fuel.β-ray Induced X-ray Spectrometry(BIXS)based onβ-rays has gradually become a research hotspot at home and abroad due to its low memory effect and small detector size.The size and material design of the BIXS detector were optimized by the Monte Carlo method(MCNP),and finally a small gaseous tritium detector with high concentration that could be measured online was obtained.The results show that under the working pressure of 0.5 MPa,the small BIXS measurement system with a beryllium window thickness of 0.1 mm and a beryllium window gold coating thickness of 125 nm can realize the online measurement of tritium gas and the miniaturization of the detector.