基于γ能谱测量资料再利用的区域环境天然放射性水平评价方法研究  

Research on the Evaluation Method of Regional Environmental Natural Radioactivity Level Based on the Reuse of γ-ray Spectrum Measurement Data

作　　者：彭文彪 刘俊峰 陶峰 韦光景 孟繁星 洪小雁 刘虹 姜东雪 Peng Wenbiao;Liu Junfeng;Tao Feng;Wei Guangjing;Meng Fanxing;Hong Xiaoyan;Liu Hong;Jiang Dongxue(Hunan Institute of Nuclear Geological Survey,Changsha Hunan 410011,China)

机构地区：[1]湖南省核地质调查所,湖南长沙410011

出　　处：《工程地球物理学报》2023年第4期509-517,共9页Chinese Journal of Engineering Geophysics

基　　金：湖南省地质院科技开发研究项目(编号:HNGSTP202207)。

摘　　要：电离辐射是生态环境的重要组成部分之一,关系到公众身心健康,并越来越受到社会重视。环境天然放射性数据通过诸如就地、车载以及航空测量等测量方法获得,获得这些数据投入费用巨大。核物理理论的应用探索了利用放射性照射量或活度来计算地表空气吸收剂量率的方法,并催生了“环境γ能谱学”和环境天然放射性水平评价的多种解决方案。我国60多年来核地质勘查积累了海量天然放射性数据,这些资料的再利用及利用方向值得探讨,运用相关的理论和方法来实现已有γ能谱测量资料再次利用,并进行区域环境天然放射性水平评价现实意义重大。本文基于20世纪90年代在永兴县某地段测量的放射性γ能谱,利用Beck公式进行了放射性γ能谱换算为空气吸收剂量率的验证性工作,参与对比数据234组,Beck公式各算式相对误差范围值为-14.8%~7.0%,相对误差平均值为-3.1%~-2.8%,γ能谱数据转换为空气吸收剂量率误差可以接受,表明该方法有效。Ionizing radiation,as one of the important components of ecological environment related to public physical and mental health has been paid more and more attention by the society.Environmental natural radioactivity data are obtained by means of costly measurements such as in situ,vehicle-borne and aerial surveys.The application of the nuclear physics theory has explored the technique of radiation exposure or activity to calculate the absorbed dose rate of surface air,and has given rise to a variety of solutions for“environmentalγspectroscopy”and the assessment of environmental natural radioactivity levels.The utilization of the massive natural radioactivity data accumulated in nuclear geological exploration in the past 60 plus years in China,is worth discussing and is of great practical significance to use relevant theories and methods to reuse the existingγ-spectral measurement data and evaluate the level of natural radioactivity in the regional environment.In this paper,based on the radioactive gamma spectrum measured in a section of Yongxing county in the 1990s,the confirmative work of converting radio-γspectra into air absorbed dose rate was carried out by BECK formula.234 groups of data were compared.The relative error range of Beck formula equations was-14.8%~7.0%,and the average relative error was-3.1%~2.8%.The conversion error ofγspectral data into air absorbed dose rate is acceptable,which shows that the method is effective.

关 键 词：Γ能谱 放射性水平 空气吸收剂量 当量剂量 

分 类 号：P631.6[天文地球—地质矿产勘探]