FNS-100正比计数器用于测量快中子场能谱时的干扰分析

Disturbing signal analysis of fast neutron energy spectrum measurement with FNS-100 proportional counter

为了了解FNS-100正比计数器用于测量快中子场能谱时干扰信号的特性,本文计算分析了60Co产生的低能γ射线以及7MeV和10MeV的高能γ射线所产生的干扰,同时模拟了反冲3He核、反冲质子在该正比计数器中产生的干扰影响。计算结果表明,γ射线对快中子能谱测量几乎没有影响,而反冲3He核和反冲质子存在比较大的影响。

In order to study the character of disturbing signals in the measurement of fast neutron field with FNS-100 proportional counter, spectra of the low energy gamma rays produced by ^60Co as well as 7 MeV and 10 MeV high energy gamma rays are calculated and analyzed. In addition, the disturbance from ^3He recoil and proton recoil are simulated. The results show that gamma rays give little effect on the measurement of fast neutron energy spectra, but 3He recoil and proton recoil have considerable effect on it.