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Electronic dose conversion technique using a NaI(Tl) detector for assessment of exposure dose rate from environmental radiation

机译:使用NaI(Tl)检测器的电子剂量转换技术,用于评估环境辐射的暴露剂量率

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An electronic dose conversion technique to assess the exposure dose rate due to environmental radiation specially from terrestrial sources was developed. For a 2/spl times/2 inch cylindrical NaI(Tl) scintillation detector, pulse-height spectra were obtained for gamma-rays of energy up to 3 MeV by Monte Carlo simulation. Based on the simulation results and the experimentally fitted energy resolution, dose conversion factors were calculated by a numerical decomposition method. These calculated dose conversion factors were, then, electronically implemented to a developed dose conversion unit (DCU) which is a microprocessor-controlled single channel analyzer with variable discrimination levels. The simulated spectra were confirmed by measurement of several monoenergetic gamma spectra with an multichannel analyzer. The converted exposure dose rates from the implemented dose conversion algorithm of DCU for the field test in the vicinity of the nuclear power plant at Kori as well as for standard sample sources were also evaluated, and the results were in good agreement with separate measurements by a high pressure ionization chamber within 6.4%.
机译:开发了一种电子剂量转换技术,用于评估特别是来自陆地来源的环境辐射引起的暴露剂量率。对于2 / spl次/ 2英寸的圆柱形NaI(Tl)闪烁探测器,通过蒙特卡洛模拟获得了能量高达3 MeV的伽马射线的脉冲高度谱。根据模拟结果和实验拟合的能量分辨率,通过数值分解方法计算剂量转换因子。然后,将这些计算出的剂量转换因子以电子方式实现到已开发的剂量转换单元(DCU),该单元是微处理器控制的具有可变区分度的单通道分析仪。通过使用多通道分析仪测量几个单能伽马光谱来确认模拟光谱。还评估了DCU实施的剂量转换算法对Kori核电厂附近的现场测试以及标准样品来源的转换后的暴露剂量率,结果与通过ACU进行的单独测量非常吻合高压电离室在6.4%以内。

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