含铌材料中Nb-93m射线的吸收试验研究

Study on Absorption of Nb-93m Rays in Containing Niobium Materials

为了确定没有辐照监督管的研究堆压力容器材料的快中子注量,选用快中子活化压力容器材料生成的Nb-93 m来确定快中子注量。而Nb-93 m射线的能量比较低,在测量过程中容易被吸收,所以准确测量Nb-93 m射线的吸收系数很关键。本文通过试验的方法测量了Nb-93 m射线和Eu-152射线在有机玻璃中的线性吸收系数,为测量压力容器的快中子注量探索了新方法。

In order to determine the fast neutrons fluence of the pressure vessel material in the research reactor with out radiation monitoring tube,Nb-93 m generated from the fast neutron activation was selected to determine the fast neutrons fluence.However,the energy of Nb-93 m ray is relatively low and easy to be absorbed in the measurement process,so it is crucial to accurately measure the absorption coefficient of Nb-93 m ray.In this paper,the linear ab sorption coefficient of Nb-93 m raysand Eu-152 rays in plexiglass was measured experimentally,and a method for measuring the fast neutrons fluence in pressure vessel was explored.