野外就地测量便携式NaI(Tl)γ谱仪的初步标定及花岗岩标定台的建立  

Calibration of field ORTEC MicroNomad γ-ray spectrometer for establishing a granite calibration block

作　　者：王同利[1] 陈杰[1] 雷生学[1] 王昌盛[1] 

机构地区：[1]中国地震局地质研究所,地震动力学国家重点实验室,北京100029

出　　处：《核技术》2008年第2期137-141,共5页Nuclear Techniques

基　　金：城市活断层探测与地震危险性评价项目(20041138)资助

摘　　要：高效率低分辨率的便携式NaI(T1)γ谱仪野外就地测量是释光、电子自旋共振测年中环境剂量率测量的重要方法之一,其标定是一项重要的基础性工作。我们利用英国牛津大学的混凝土标定台对本实验室的ORTEC MicroNomad型NaI(T1)γ谱仪进行了标定,初步建立了几何形状、材料成分和密度与野外测量条件相似的NaI(T1)γ谱仪花岗岩标定台,并通过不同方法测量得到了本标定台的放射性元素含量。Portable field NaI（Tl）γ-ray spectrometer is an important tool for determining potassium, uranium and thorium contents in sediments. The results depend on accuracy of the calibration and the extent to which the measuring conditions resemble those adopted during calibration, e.g. geometry, background radiation, components and densities of materials, etc. Calibration of a field ORTEC MicroNomad NaI（Tl）γ-ray spectrometer, in auger hole geometry was done using the Oxford calibration blocks with known contents of radioisotopes of K, U and Th. A granite block similar to Heidelberg＇s calibration block was set up at SKLED. It can be used as a calibration block to check the γ-ray spectrometer. Contents of K, U and Th of the granite block were analyzed using different methods.

关 键 词：环境剂量率 便携式NaI(Tl)γ谱仪 标定 

分 类 号：X141[环境科学与工程—环境科学] X142