固定式环境γ辐射剂量率仪现场校准技术

On-site Calibration Technology for Fixed Environmental Gamma Radiation Ratemeter

  • 摘要: 固定式环境γ辐射剂量率仪是承担环境连续监测任务的主要设备,不便于拆卸送往计量实验室进行校准检定,且送检周期较长,影响连续监测点数据的连续性。为按期校准固定式仪表,本文结合蒙特卡罗方法研制了能量补偿型高气压电离室和便携式137Cs照射装置,利用天然本底辐射(陆地γ射线和宇宙射线)和便携式照射装置产生的137Cs γ射线参考辐射对固定式环境γ辐射剂量率监测仪表开展现场校准实验。结果表明,采用环境比对和现场照射的方法能较好地解决固定式环境γ辐射剂量率仪的校准问题,现场所得校准因子与标准实验室中校准因子的相对偏差小于5%。

     

    Abstract: The fixed environmental gamma radiation ratemeter is the main equipment to undertake environmental continuous monitoring tasks and not easy to move for metrology laboratory calibration, and the submission of a longer period affects the continuity of the continuous monitoring data. For the on time calibration of fixed environmental gamma radiation ratemeter, combined with the Monte Carlo method, the energy-compensated high-pressure ionization chamber and portable 137Cs irradiation facility were developed. Using natural background radiation (including cosmic rays and terrestrial gamma rays) and 137Cs gamma rays reference radiation field, the on-site calibration for fixed environmental-gamma radiation ratemeter was carried out. The results show that the environment intercomparison and onsite irradiation can solve the calibration problem of fixed environmental gamma radiation ratemeters, and the relative deviation of calibration factors obtained from on-site calibration and in standard laboratory is less than 5%.

     

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