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介绍了用飞行时间方法测量裂变中子谱时中子在裂变碎片探测器上和周围材料上散射的影响。对裂变碎片探测器和中子探测器之间空气层及测量室的墙壁上散射的影响,用飞行时间方法进行了测量,也用Monte Carlo方法进行了计算,并对用两种方法得到的结果进行了比较。结果表明,中子散射对裂变中子谱的影响是相当重要的,它能明显地改变裂变中子谱的形状。
The effect of neutron scattering on fission debris detectors and surrounding materials when using fission neutron spectroscopy is described using the time of flight method. The impact on the scattering of the air layer between the fissile fragment detector and the neutron detector and the wall of the measuring chamber was measured by the time of flight method and also calculated by the Monte Carlo method. The results obtained by the two methods Compared. The results show that the influence of neutron scattering on the fission neutron spectrum is quite important, which can obviously change the shape of the fission neutron spectrum.