核设施液态流出物非介入式连续监测仪校准技术研究

Research on Accurate Calibration Method of Non-intrusive Liquid Effluent Monitor of Nuclear Facility

在用谱仪测量样品活度时,准确地校准谱仪系统探测效率曲线是测量结果准确可靠的先决条件。在核设施液态流出物监测中,由于被测样品空间结构复杂,核素种类多且半衰期较短,通过制作标准液体源校准探测器系统的可行性低。本文讨论了几种核设施管道外非介入式液态流出物监测仪的校准方法:标准液体源法、数值积分法以及代表点法,选取其中的标准液体源法为初级方法,同时进行数值积分法和代表点法的实验,从相对偏差和不确定度两方面考虑,发现代表点法可作为适用有效的校准方法。

During the process of measuring the sample activity with a spectrometer,the accurate calibration of detection efficiency curve of the spectrometer system is the accurate and reliable prerequisite for measurement results.During the liquid effluent monitoring of nuclear facility,the sample is liquid sealed inside the tubes.Due to diverse radionuclide species and short half-life of some radionuclides,the feasibility of making a standard liquid source for the calibration of the detector system is low.This paper aims to discuss some calibration methods for nuclear facility non-intrusive liquid effluent monitor,such as standardized liquid source method,numerical integration method and representative point method.The standard liquid source method as theprimary method was selected,and the representative point method and experimental method were conducted at the same time.Comparing relative deviation and uncertainty of the three methods,it is found that the representative point method can be used as an effective calibration method.