核电子学与探测技术

为适应高氡环境下氚实时监测的需求,基于能量甄别原理设计了平板型和圆柱形双层电离室,并开展了两类电离室主要特性研究。用MC法对两类电离室的能量响应进行了模拟,结果表明:平板型电离室更容易获得较大的灵敏体积而降低探测下限,理论可探测浓度为6.5×104Bq/m3,圆柱形电离室具有更好的α补偿性能。用Maxwell 3D对其内部电场进行了模拟,得出圆柱形电离室内部电场的均匀性明显优于平板型电离室,基于模拟结果,对平板型电离室的电场进行了优化设计。

In order to meet the needs of real-time monitoring of tritium in high radon environment,the flat and cylindrical double-layer ionization chamber is designed based on the principle of energy screening,and carrying out the study about the main characteristics of two kinds of ionization chamber,the results show that:The flat type ionization chamber is easier to obtain the larger sensitive volume and lower the detection limit,the theoretical detectable concentration is 6. 5 × 104 Bq/m3,and cylindrical ionization chamber has a better α compensation ability. The internal electric field was simulated by using Maxwell 3 D,The result shows that the electric field inside cylindrical ionization chamber is better than that of flat ionization chamber. Based on the simulation results,the electric field of flat ionization chamber is optimized.