基于x射线源的剂量计现场标定方法

Wenhui Lv, Huiping Guo, N. Lv, Chenyang Tian, K. Zhao, Xiaotian Wang, Yijie Hou
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引用次数: 0

摘要

核设施环境辐射剂量实时监测是核设施安全的重要组成部分,为了保证监测结果的准确性,需要对监测结果进行定期校准。核设施周边环境剂量计安装分散,数量庞大,分布广泛,处于实时监测状态;如果在标准实验室进行校准,将耗费大量人力和财力;更重要的是,它会使环境失控。针对固定式伽玛辐射剂量计测量精度问题,提出了一种现场校准方法。放射源为x射线谱,剂量参考仪为高压电离,经国家标准实验室标定。现场校准分为两个部分;首先在实验室进行了高、低能量剂量计的能量响应实验,并结合蒙特卡罗模拟得到了能量响应曲线;其次,在测量剂量计的现场进行了实验,并采用代入法对剂量计进行了标定;最后通过能量曲线校正得到标定系数。为了验证现场校准方法的准确性,校准后的剂量计在标准实验室进行了测试,误差为3.4%。结果表明,采用x射线现场标定方法是可行的,可以提高固定式γ射线仪测量结果的精度;更重要的是对辐射安全管理和辐射环境评价具有重要的参考价值。
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On-Site Calibration Method of Dosimeter Based on X-Ray Source
The real-time monitoring of environmental radiation dose for nuclear fa-cilities is an important part of safety, in order to guarantee the accuracy of the monitoring results regular calibration is necessary. Around nuclear facilities there are so many environmental dosimeters installed dispers-edly, because of its huge quantity, widely distributed, and in real-time monitoring state; it will cost lots of manpower and finance if it were tak-en to calibrate on standard laboratory; what’s more it will make the en-vironment out of control. To solve the problem of the measurement ac-curacy of the stationary gamma radiation dosimeter, an on-site calibra-tion method is proposed. The radioactive source is X-ray spectrum, and the dose reference instrument which has been calibrated by the national standard laboratory is a high pressure ionization. On-site calibration is divided into two parts; firstly the energy response experiment of dosim-eter for high and low energy is done in the laboratory, and the energy response curve is obtained combining with Monte Carlo simulation; sec-ondly experiment is carried out in the field of the measuring dosimeter, and the substitution method to calibrate the dosimeter is used; finally the calibration coefficient is gotten through energy curve correction. In order to verify the accuracy of on-site calibration method, the calibrated dosimeter is test in the standard laboratory and the error is 3.4%. The re-sult shows that the on-site calibration method using X-ray is feasible, and it can improves the accuracy of the measurement results of the stationary γ-ray instrument; what’s more important is that it has great reference value for the radiation safety management and radiation environment evaluation.
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