采用多丝正比室读出的屏栅电离室能量分辨研究
Energy-resolution Study of Frisch-grid Ionization Chamber Using Multi-wire Proportional Chamber Readout
尹小豪 1魏向伦 2黄鑫杰 1邹海川 3邱天力 1何周波 1杨远胜 1李志杰 1李蒙 1马朋 2杨贺润 2鲁辰桂 2胡荣江 2段利敏2
作者信息
- 1. 中国科学院近代物理研究所,甘肃兰州 730000;中国科学院大学核科学与技术学院,北京 100049
- 2. 中国科学院近代物理研究所,甘肃兰州 730000
- 3. 中国科学院大学核科学与技术学院,北京 100049;兰州大学核科学与技术学院,甘肃兰州 730000
- 折叠
摘要
搭建了一个基于多丝正比室读出的屏栅电离室探测器,使其保留屏栅电离室屏蔽特性的同时具备雪崩放大功能,通过在探测器内部对原初电离信号进行预放大,以提高信噪比,改善探测器的能量分辨率.利用241 Am源详细测试了探测器在不同气压、沉积能量、阳极丝径时能量分辨率及增益随阳极电压的变化关系.探测器最佳能量分辨对应的工作电压与入射粒子在漂移区中沉积的能量有关,能量沉积越小,对应的最佳工作电压越高,探测器的增益越大.对于5.486 MeV的241 Am α粒子源的能量分辨率可达1.45％.
Abstract
A Frisch-grid ionization chamber detector based on multi-wire proportional chamber readout is built.It is equipped with avalanche amplification while retaining the shielding characteristics of the Frisch-grid ionization chamber to pre-amplify the primary ionization signal inside the detector,improve the signal-to-noise ratio,and improve the energy resolution of the detector,especially for particles with low energy deposition in the detector drift region.In order to study the performance of the detector,the energy resolution and the variation of gain with anode voltage were tested in detail using a 241 Am source at different air pressures,different deposition energy,and different anode mental wire diameters.Electronical noise and detector gain and its fluctuations deter-mine the variation of detector energy resolution.The operating voltage corresponding to the best energy resolution of the detector is related to the energy of the incident particles deposited in the detector drift region,and the lower the deposition energy,the higher the corresponding best operating voltage and the higher the gain of the detector.The energy resolution can reach 1.45％for a 241 Am source of 5.486 MeV.In practical applications,the operating voltage of the detector should be set according to the energy interval of the measured particles,so that its gain is in the appropriate range to achieve better energy resolution and meet the demand for particle detection.
关键词
雪崩放大/信噪比/能量分辨率/空间电荷效应Key words
avalanche amplification/signal-to-noise ratio/energy resolution/space charge effect引用本文复制引用
基金项目
中国科学院战略重点研究项目(XDB34000000)
国家重点研发计划项目(2018YFE0205200)
国家重大科研仪器研制项目(11927901)
国家自然科学基金(11875301)
国家自然科学基金(11875302)
国家自然科学基金(U1867214)
国家自然科学基金(1832105)
国家自然科学基金(U1832167)
中国科学院功能开发项目(2022G101)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据