Design of calibration device for real-time on-line monitoring system of water radioactivity

被引：0

作者：

Guo S. ^{[1
]}

Xiang Y. ^{[2
]}

Ge L. ^{[2
]}

Deng X. ^{[3
]}

Wang L. ^{[3
]}

Luo M. ^{[1
]}

Lai M. ^{[2
]}

Zhu X. ^{[3
]}

机构：

[1] Newray Technology Co. Ltd., Chengdu

[2] Key Laboratory of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology, Chengdu

[3] Radiation Environmental Management and Monitoring Center of Sichuan Province, Chengdu

来源：

He Jishu/Nuclear Techniques | 2023年 / 46卷 / 01期

关键词：

Monte Carlo simulation; Real time online monitoring system for water radioactivity; Spectral calibration; Spectral line drift;

D O I：

10.11889/j.0253-3219.2023.hjs.46.010401

中图分类号：

学科分类号：

摘要：

[Background] In the long-term uninterrupted work of the real-time on-line monitoring system of water radioactivity, the spectrum drift, line broadening and shift of peak position are caused by the temperature change of the detector and various electronic components and the aging of components, which leads to the difficulty of spectral line analysis and the error of analytical results. [Purpose] This study aims to develop a calibration device for real-time on-line monitoring system of water radioactivity based on cerium bromide detector. [Methods] The device was designed to consists of 137Cs standard source (exemption source), lead block, lead chamber with calibration hole and linear motor. The optimum opening radius of the calibration hole and the optimum thickness of the lead block were obtained by Monte Carlo simulation. The standard 137Cs source was used as the standard reference peak, and the calibration of peak position and peak area, the peak position drift and peak area of 137Cs full-energy peak was analyzed by software with real-time gain calculation and parameters adjustment. Finally, the device was applied to the field application verification. [Results & Conclusions] Results of Monte Carlo simulation indicate that the optimum radius of the calibration hole is 2.2 cm and the optimum thickness of the lead block is 5 cm. The verification results shows that the device can limit the change of peak position and peak area to ±1% and ±5%, respectively. © 2023 Science Press. All rights reserved.

引用

共 20 条

[1] Standards for drinking water quality: GB 5749—2022, (2022)
[2] GUO Shengliang, XIONG Maolin, GE Liangquan, Et al., Optimization of array CeBr<sub>3</sub> scintillation detection device for water on-line radioactivity measurement system, Nuclear Techniques, 44, 11, (2021)
[3] ZHAO Kui, Design and evaluation of on-line monitoring system for water radiation, (2018)
[4] XU Lipeng, Research on the key technologies of online gamma-energy spectrum measurement of water, (2020)
[5] XU Yuan, KONG Haiyu, WANG Xitao, Et al., Radioactive pollution in water environment and its measurement, Nuclear Safety, 19, 1, pp. 75-79, (2020)
[6] ZHU Zhu, Research on the on-line detection technology of α/β radioactivity in water, (2020)
[7] QU Guopu, LING Qiu, GUO Lanying, Et al., Analysis of the cause for the spectrum-drifting of NaI(Tl) scintillation spectrometer[J], Journal of Central-South Institute of Technology (Science and Technology), 19, 1, pp. 47-50, (2005)
[8] LI Jiangkun, LI Yizhou, LIU Shikai, Et al., Study on the stable spectral method of aerial γ-energy spectrum based on <sup>7</sup>Be peak, Progress Report on Nuclear Science and Technology in China (Volume 7) - Proceedings of the Annual Conference of the Chinese Nuclear Society 2021, Volume 1 (Uranium Geology Sub-volume, Uranium Mining and Metallurgy Sub-volume), pp. 225-232
[9] LIU Jingnan, Correction and total spectral quantitative analysis of NaI γ spectra, (2021)
[10] XIE Qilin, BAI Lixin, ZHANG Yiyun, Et al., A time-dividing dynamic modification method of spectrum-drifting in the analysis of NaI(Tl) spectrum, Journal of Sichuan University (Natural Science Edition), 40, 3, pp. 502-506, (2003)

← 1 2 →