neutron background survey [核] 中子本底检查
slow neutron background 慢中子本底
scatter neutron background 散射中子本底
natural neutron background 天然中子本底
scattering neutron background 散射中子本底
background neutron 本底中子
The first chapter has introduced the meaning and the background of neutron knife treatment system.
第一章是绪论。 介绍了中子刀治疗系统的背景、意义及本论文研究内容。
Some external neutron and gamma source experiments were carried out to study the origin of the background.
还应用外置伽玛源和中子源进行了实验，以判断本底的来源。
Analysis of the activated background spectrum shows that natural copper is an ideal shielding material in fast neutron nuclear reactions.
通过分析天然铜的活化本底谱，可以看出它是快中子核反应中的最理想的屏蔽材料之一。
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