空间任意位置点源效率函数及参数的确定

摘要

采用蒙特卡罗(MCNP)模拟与实验相结合的方法,计算了HPGe探测器对空间不同位置、不同能量点源的探测效率.根据模拟计算结果,通过数值拟合方法,确定了HPGe探测器对点源137 Cs和60Co的探测效率函数及其参数,并对实验结果进行验证.研究表明,应用蒙特卡罗模拟方法确定HPGe γ探测器对于点源的探测效率函数及其参数是一种简便、有效的方法.%MCNP code was used to simulate the detection efficiencies for different γ-ray energies at different source positions.The counting efficiency function of the HPGe detector and its parameters have been determined.For the 137Cs and60Co point sources,the counting efficiency function of the HPGe detector and its parameters have been determined by fitting the calculated data,which was validated at different energies.The results indicate that the Monte Carlo method is simple and effective in determining the counting efficiency function of HPGe detector and its parameters for the γ-ray point sources.