• NUCLEAR TECHNIQUES
  • Vol. 46, Issue 1, 010401 (2023)
Shengliang GUO1,*, Yezhou XIANG2, Liangquan GE2, Xiaoqin DENG3..., Liang WANG3, Mingtao LUO1, Maolin LAI2 and Xiaojiao ZHU3|Show fewer author(s)
Author Affiliations
  • 1Newray Technology Co. Ltd., Chengdu 610052, China
  • 2Key Laboratory of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology, Chengdu 610059, China
  • 3Radiation Environmental Management and Monitoring Center of Sichuan Province, Chengdu 610031, China
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    DOI: 10.11889/j.0253-3219.2023.hjs.46.010401 Cite this Article
    Shengliang GUO, Yezhou XIANG, Liangquan GE, Xiaoqin DENG, Liang WANG, Mingtao LUO, Maolin LAI, Xiaojiao ZHU. Design of calibration device for real-time on-line monitoring system of water radioactivity[J]. NUCLEAR TECHNIQUES, 2023, 46(1): 010401 Copy Citation Text show less

    Abstract

    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.

    Shengliang GUO, Yezhou XIANG, Liangquan GE, Xiaoqin DENG, Liang WANG, Mingtao LUO, Maolin LAI, Xiaojiao ZHU. Design of calibration device for real-time on-line monitoring system of water radioactivity[J]. NUCLEAR TECHNIQUES, 2023, 46(1): 010401
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