同位素铯源小尺度参考辐射蒙特卡罗模拟研究

Monte Carlo Simulation Research of ¹³⁷Cs Minitype Reference Radiation

摘要: 为研究同位素铯源小尺度参考辐射的计量特性与散射特征，采用蒙特卡罗程序MCNP开展了模拟研究，并将模拟结果与实验结果进行对比。本文厘清了边长为600 mm的铅屏蔽立方体同位素铯源小尺度参考辐射的计量特性与空间散射射线的特征信息，明确了待检仪器探头尺寸对小尺度参考辐射中散射成分的影响规律，确定了用于表征散射特征的计量特征点的位置。

Abstract: In order to research the metrological and scattering features in a minitype reference radiation (MRR) with isotope cesium source, the Monte Carlo program MCNP was used to simulate and analyze the MRR. Comparison between simulation and experiments was also carried out in the work. The metrological and scattering radiation characteristics of the MRR, which is a 600 mm cubic box shielded by lead with isotope cesium source, are clarified in this paper. The influence of the probe size on the scattering components in an MRR is defined. The position of the metrological feature point used to characterize the scattering feature is also determined by the work.