阈探测器法测量Am-Be中子源屏蔽辐照腔内的中子能谱

Neutron Spectrum Measurement From Am-Be Neutron Sourcein Radiation Shield Cavity

摘要: 选用多种活化箔片作为阈探测器，测量了Am-Be中子源屏蔽辐照腔内的中子能谱。在待测中子场点对活化箔片进行辐照后，测量各箔片生成放射性核的γ放射性，计算出各箔片的实验比反应率。运用SAND-Ⅱ迭代方法，求解出Am-Be中子源屏蔽辐照腔内的中子能谱。详细分析了初始谱、能群划分、能群截面等对解谱准确度的影响。

Abstract: The neutron spectrum from the Am-Be neutron source in the radiation shield cavity was measured by threshold detector method. The threshold detector was chosen from multiple activation foils. The experimental reaction rate ratio of each foil was respectively measured. The energy spectrum in radiation shield cavity was deduced by using the method of SAND-Ⅱ. Meanwhile, the effect of precision to analyze spectrum was also detailedly analyzed.