摘要
在零功率堆中子衰变常数(α常数)瞬态测量实验时,必须进行本底中子的屏蔽。利用理论计算和实验测定的方法,得到含B4C聚乙烯对D-T中子的屏蔽效果,并在此基础上,设计了探测屏蔽系统用于α常数的瞬态测量实验。测量结果与系统设计值相符,测量数据的信噪比与理论计算结果相吻合。
It is necessary to shield the background neutron during the measurements of neutron decay constant on the zero power assembly. Based on the numerical calculation and experiment measurement, the radiation-shielding effects of the B4C＋（CH2）n material to DT neutron are gained. Using the results, detecting shielding system was designed for measuring the prompt neutron decay constant a of the zero power assembly. The measurement result is agree with the design value. The signal-to noise ratio（9 ： 1） of the neutron decay constant is similar to the numerical calculation （7.5 ： 1）.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2005年第5期474-476,共3页
Atomic Energy Science and Technology
关键词
中子衰变常数
屏蔽效果
含B4C聚乙烯
neutron decay constant
radiation-shielding effects
B4C＋（CH2）n material
