基于MCNP程序和γ射线能谱法对未知材料线吸收系数的测定  

Study of the Unknown Line Absorption Coefficient of Material by MCNP Program and γ-ray Energy Spectrum Analysis

作　　者：周剑良[1] 吕洋[1] 程晓龙[1] 赵修良[1] 徐继圆[1] 唐甜[1] 

机构地区：[1]南华大学核科学技术学院,衡阳421001

出　　处：《科学技术与工程》2013年第22期6580-6582,6620,共4页Science Technology and Engineering

基　　金：国家军品配套项目(JPPT-115-5-882)资助

摘　　要：为了计算某未知介质对γ射线的线吸收系数,建立了两种模型:首先用MCNP程序和γ射线能谱法测量了不同能量射线下铅、铝线吸收系数,并与文献值进行对比,测量误差在5%以内,明确了方法的可行性。然后分别用两种方法计算了未知物料在60Co源下的线吸收系数,结果偏差为4.53%,可以确认计算结果的准确性,为γ射线在未知物料中线吸收系数的测定提供了可靠的方法。For calculating the γ-ray line absorption coefficient in some unknown materials,two models were conceived,and gauged the line absorption coefficient of γ-ray with different energy in Pb and Al materials with the approaches of MCNP program and γ-ray energy spectrum analysis.The results were compared with the values of generally acknowledged.The measuring error was less than 5%,the feasibility of the two methods were proved.The unknown material line absorption coefficient with the 60 Co source is calculated by the two methods separately,and the deviation is 4.53%,which can provide one reliable way for gauging the γ-ray line absorption coefficient in unknown material.

关 键 词：MCNP程序 γ射线能谱法 线吸收系数 

分 类 号：TL816.2[核科学技术—核技术及应用]