GR320γ能谱仪人工核素面源刻度  

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

作　　者：王景丹[1] 倪卫冲[1] 

机构地区：[1]核工业航测遥感中心,河北石家庄050002

出　　处：《铀矿地质》2012年第3期152-156,共5页Uranium Geology

摘　　要：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。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.

关 键 词：GR320 Γ能谱仪 人工核素面源 面活度 效率因子 

分 类 号：P631.63[天文地球—地质矿产勘探]