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241Am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241Am α粒子源的能量分辨率可达1.45%。
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 determine 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.
作者
尹小豪
魏向伦
黄鑫杰
邹海川
邱天力
何周波
杨远胜
李志杰
李蒙
马朋
杨贺润
鲁辰桂
胡荣江
段利敏
YIN Xiaohao;WEI Xianglun;HUANG Xinjie;ZOU Haichuan;QIU Tianli;HE Zhoubo;YANG Yuansheng;LI Zhijie;LI Meng;MA Peng;YANG Herun;LU Chengui;HU Rongjiang;DUAN Limin(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)
出处
《原子能科学技术》
EI
CSCD
北大核心
2024年第1期225-230,共6页
Atomic Energy Science and Technology
基金
中国科学院战略重点研究项目(XDB34000000),中国科学院功能开发项目(2022G101)
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(11875301,11875302,U1867214,1832105,U1832167)。
关键词
雪崩放大
信噪比
能量分辨率
空间电荷效应
avalanche amplification
signal-to-noise ratio
energy resolution
space charge effect
