土壤湿度对现场γ能谱测量的影响修正  

Soil Moisture Effect Correction for On-Site γ-ray Spectrometry

作　　者：储星铭[1] 付宸[2] 

机构地区：[1]中国地质大学地下信息探测技术与仪器教育部重点实验室,北京100083 [2]东华理工大学,江西抚州344000

出　　处：《原子能科学技术》2012年第B09期547-551,共5页Atomic Energy Science and Technology

基　　金：地下信息探测技术与仪器教育部重点实验室(中国地质大学;北京)开放课题资助项目(GDL0908)

摘　　要：现场γ能谱测量在地质勘查和电离辐射环境测量中是一种高效、准确、经济的方法。针对γ能谱在现场测量过程中的主要影响因素——土壤湿度,根据γ射线在土壤中的衰减规律,建立数值模型,得到不同物质的质量衰减系数和线衰减系数,计算不同土壤湿度的修正系数。同时利用四道γ能谱仪对同一地点不同土壤湿度情况下土壤中铀、钍、钾含量进行了实际测量,根据计算的修正系数得到的修正数值与HPGe谱仪测量的结果进行了比较。结果表明,现场γ能谱测量结果通过数值模拟计算修正能有效降低土壤湿度的影响。Field γ-ray spectrometry is an efficient,accurate and economical way in geological exploration and measurement of ionizing radiation environment.It was mostly influenced by soil moisture in field measurement process.Different soil moisture correction coefficients can be got when a numerical model was established and the attenuation coefficients of mass and line were calculated based on the γ-ray attenuation law in soil.Contents of uranium,thorium and potassium were measured by four-channel γ spectrometer under different soil moistures in the same soil location.The correction value calculated from previous correction coefficient was compared with that of the HPGe spectrometer measurement.The results show that the effects of soil moisture for on-site γ-ray spectrometry can be reduced after correction by numerical simulation.

关 键 词：现场γ能谱 土壤湿度 修正 

分 类 号：P631.6[天文地球—地质矿产勘探]