GR320γ能谱仪人工核素面源刻度

介绍了GR320γ能谱仪人工核素面源刻度原理和方法、刻度实验过程以及对刻度结果的应用。通过人工核素小面源模拟大面源的刻度,得到人工核素137 Cs和60 Co面源的效率因子,使GR320γ能谱仪在进行环境放射性γ辐射水平调查中能够定量给出人工核素137 Cs和60 Co的面活度。对新疆某地航测异常的地面验证测量结果表明,该航测异常地表确实存在人工核素137 Cs,且GR320γ能谱仪测量的面活度结果与该异常就地HPGe谱仪的测量结果基本相符。此法可推广到其它型号的便携式γ能谱仪的刻度,也可扩展到其它人工核素面源的刻度。

The Calibration of GR320 Gamma Ray Spectrometer With Manmade Radionuclide Planar Source

This article introduces the method, experiment and application of calibration for GR320 gamma ray spectrometer with manmade nuclide planar source. Efficiency parameter of Cesium-137 and Cobalt-60 manmade nuclide, was obtained by simulating the infinite planar source with finite planar source, and the GR320 gamma ray spectrometer can detect the surface specific activity of Cesium-137 and Cobalt-60 in surveying the gamma ray radiation of environment. By checking ＂airborne hot-point＂ in Xinjiang with GR320 gamma ray spectrometer, the airborne anomaly was validated with Cesium-137, and the was correspondant to the in-situ tested result of HPGe spectrometer. Therefore the method can be used to calibrate other-type portable gamma ray spectrometer and other manmade nuclide planar source.