Development of a current measurement system for 4itγ ionization chamber

被引：0
|
作者：
Chen, Cong [1 ]
Zeng, Weihua [1 ]
Yang, Zhijie [2 ]
Hou, Shengli [1 ]
Liang, Juncheng [2 ]
Liu, Haoran [2 ]
机构：
[1] China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China
[2] Natl Inst Metrol NIM, Beijing 100029, Peoples R China
来源：
APPLIED RADIATION AND ISOTOPES | 2025年 / 218卷
关键词：
4it gamma ionization chamber; Current measurement; High-value resistance method;
D O I：
10.1016/j.apradiso.2025.111684
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A current measurement system named ICMS-TIA (Ionization Current Measurement System based on Transimpedance Amplifier) for rapid and accurate measurement of the ionization current of 4it gamma ionization chamber is developed based on an improved high-value resistance I-V conversion method with range switching function. The effective measurement range of the ICMS-TIA is from 50 fA to 50 mu A and the response time of the system is less than 2.8 s. The test shows that the deviation of the current measurement above 1 pA is less than 0.41%, and the uncertainty over a range of current levels is given. In the linearity tests, the maximum deviation is 1.15 %. These tests indicate that this system can be used for current measurement of 4it gamma ionization chamber.
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页数：8
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