^(60)Co大型客体辐射成像系统γ检测射线束研究

Research γ inspection ray of ^(60)Co radiography system for large objects

应用MCNP程序研究了60Co大型客体辐射成像系统中的检测射线束。本计算模拟实际钴源大小获得了面源条件下距源不同位置处的射线剂量分布曲线,对近检测面处射线束的强度和分布形状给出详细的计算结果,并由此得出成像系统对被检客体的单次检测剂量。从结果分析,采用该计算模型得到的射线束具有良好的准直效果并满足实际检测的要求。

This paper presents the research of the inspection ray of ^(60)Co radiography system using MCNP code. By simulating the actual size of cobalt isotope as a surface source, we calculate the dose distribution curves at different distance from the source location. The detailed calculation results on radiation intensity and distribution curve near the inspection surface are given. Further result of dose received by the object during inspection is obtained too. Our works and analysis show that using the model given by this article, the ray has good collimation effect and fulfilled the requirement of inspection in practical use.