【摘要】 为提高符合效率外推法测量¹³³ Xe活度的准确度,提出一种基于Geant4软件包的蒙特卡罗理论模拟方法,通过理论预测¹³³ Xe活度测量的效率外推曲线和活度,确定了最佳的测量条件和数据拟合函数。使用4πβ（PS）-4πγ（NaI）符合测量系统,绝对测量了¹³³ Xe活度,并与利用HPGeγ谱仪的测量结果进行了比较,验证了MC模拟方法预测的可靠性。更多还原

【Abstract】 In order to improve measurement accuracy of ¹³³Xe activity by the coincidence efficiency extrapolation technique,A Monte Carlo simulation method based on Geant4 software is proposed.By predicting the efficiency extrapolation curve and activity of ¹³³Xe,the optimal measurement conditions and data fitting function are determined.The activity of ¹³³Xe is determined absolutely by 4πβ（PS）-4πγ（NaI）coincidence measurement system,and is compared with the measurement results obtained by using HPGeγspectrometry system.The experiment data show that the results predicted by Monte Carlo simulation are reliable.更多还原