摘要
本文用费米年龄和扩散理论模拟研究了深层中子土壤水分仪锂玻璃闪烁探头的测量机制。闪烁探头测得的计数是与中子源强度、热中子云球内探测器对应介质的容积含水量、锂玻璃闪烁体与源之间的距离及锂玻璃闪烁体厚度等有关的热中子计数。当闪烁体与源之间的距离固定后,探测器探测到的热中子计数,主要是以闪烁体为中心,闪烁体侧面立体角内介质与中子作用的热中子计数。在距探测器≥15cm处的“高含水层”,对锂玻璃闪烁体探测的热中子计数贡献在误差范围内。
The Fermi age and diffusion theory modeling is applied to study detection mechanism of a subsurface neutron soil moisture meter with a Li-glass scintillation probe. It is found that when the distance between the scintillator and the source is fixed, the thermal neutron counts given by the detector are mainly due to the interaction of neutrons with the medium confined by the side solid-angle of the scintillator with the latter as the centre.
出处
《核技术》
CAS
CSCD
北大核心
1989年第1期15-18,共4页
Nuclear Techniques
关键词
锂玻璃闪烁体
土壤水分仪
闪烁探测
Fermi age and diffusion theory Subsurface neutron soil moisture meter Li-glass scintilla tor
