铀生产工艺设备中滞留量测量的自吸收校正方法

摘要

实现铀生产工艺设备中滞留量的准确测量是核材料衡算与控制过程的一个关键点。由于γ射线的自吸收效果显著，工艺设备几何结构特殊，无法采用常规校准方法进行数据处理。本文开展该情况下的自吸收校正方法研究，在物料厚度、介质成分、几何参数不确定的条件下，初步建立了自吸收二维校正模型。模拟样品验证表明，建立的自吸收二维校正模型满足铀生产工艺设备滞留量测量的需求。%Achieving exactly quantitative holdup in uranium produced tank is a key point for nuclear material account and control .Due to the tank’ s particularity design and gamma ray remarkable self-absorption , conventional calibration methods can ’ t be adopted for self-absorption data analysis .The self-absorption correction method in the special case was researched , and also a two-dimensional model for self-absorption correction was established .It is available for these cases such as thickness of the material , matrix ingredients and geometric are incomprehensive . The validation of simulation sample shows that the two-dimensional model meets the requirement of holdup measure-ment in uranium produced tank .