原子能科学技术2024，Vol.58Issue(1)：225-230,6.DOI:10.7538/yzk.2023.youxian.0069
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
摘要
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分类
能源科技引用本文复制引用
尹小豪,马朋,杨贺润,鲁辰桂,胡荣江,段利敏,魏向伦,黄鑫杰,邹海川,邱天力,何周波,杨远胜,李志杰,李蒙..采用多丝正比室读出的屏栅电离室能量分辨研究[J].原子能科学技术,2024,58(1):225-230,6.基金项目
中国科学院战略重点研究项目(XDB34000000) （XDB34000000）
国家重点研发计划项目(2018YFE0205200) （2018YFE0205200）
国家重大科研仪器研制项目(11927901) （11927901）
国家自然科学基金(11875301,11875302,U1867214,1832105,U1832167) （11875301,11875302,U1867214,1832105,U1832167）
中国科学院功能开发项目(2022G101) （2022G101）
