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| 4πγ电离室活度标准装置测量系统的建立及性能测试 | |
| 引用本文： | 柳加成,吴永乐,梁珺成,袁之伦,陈靖,杨元第.4πγ电离室活度标准装置测量系统的建立及性能测试[J].计量学报,2013,34(2):180-183. |
| 作者姓名： | 柳加成 吴永乐 梁珺成 袁之伦 陈靖 杨元第 |
| 作者单位： | 1. 环境保护部核与辐射安全中心, 北京 100082; 2. 中国计量科学研究院, 北京 100013 |
| 摘 要： | 基于汤姆逊平衡法原理建立了4πγ电离室活度标准装置的测量系统,该系统由高压电源、电压测量及补偿电路、测控软件组成。利用汤姆逊平衡法原理测量微弱电流,可以有效减小系统的漏流,减小本底电流对测量结果的影响,经测试该系统的本底电流小于3×10-14A。通过对测量系统的重复性、稳定性、线性和角响应等性能测试,结果表明,该测量系统能够满足4πγ电离室活度标准装置的要求。 |
| 关 键 词： | 计量学 4&pi &gamma 电离室 活度 电离电流测量 |
Establishment and Performance Testing of Measurement System for 4πγ Ionization Chamber Radioactivity Standard |
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| LIU Jia-cheng,WU Yong-le,LIANG Jun-cheng,YUAN Zhi-lun,CHEN Jing,YANG Yuan-di.Establishment and Performance Testing of Measurement System for 4πγ Ionization Chamber Radioactivity Standard[J].Acta Metrologica Sinica,2013,34(2):180-183. | |
| Authors: | LIU Jia-cheng WU Yong-le LIANG Jun-cheng YUAN Zhi-lun CHEN Jing YANG Yuan-di |
| Affiliation: | 1. Nuclear and Radiation Safety Center of Ministry of Environment Protection, Beijing 100082, China; 2. National Institute of Metrology, Beijing 100013, China |
| Abstract: | A measuring system based on Townsend induction balance method for 4πγ ionization chamber radioactivity standard is developed. The measuring system consists of high voltage source, voltage measurement, compensation circuit and control software. During Townsend balance process, the leakage currents and offset current are small in comparison with the current to be measured. The leakage and background current obtained with the measuring system is less than 3×10-14A. Measurements are performed to check the repeatability, stability, linearity and angle response of the system. The testing result shows that the measuring system meets the requirement of 4πγ ionization chamber radioactivity standard. |
| Keywords: | Metrology 4π&gamma ionization chamber Radioactivity Ionization current measurement |
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