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本文建立了用改进的活化法与蒙特卡罗计算相结合测量中子反照率的方法。实验中用激活片直接测量了西安脉冲反应堆中子照相捕集器表面不同位置处的中子总通量,计算中用蒙特卡罗MCNP程序计算了各激活片上正反方向的中子通量比;测量值经过理论计算值纠偏后,确立了测量位置处入射和反射中子的通量,从而确定了捕集器表面的中子反照率分布这一重要参数,为在中子和光子混合场下开展中子照相束捕集器参数测量和实验应用提供了参考。
In this paper, a method of measuring neutron albedo with improved activation method and Monte Carlo calculation is established. In the experiment, the total flux of neutrons at different positions on the surface of Xi’an Pulsed Reactor neutron photogrammetry was measured directly by the activation plate. The Monte Carlo MCNP program was used to calculate the neutron flux ratio in the positive and negative directions After the measured values are corrected by theoretical calculation, the fluxes of incident and reflected neutrons at the measuring position are established, and the important parameter of neutron albedo distribution on the surface of the catcher is determined. Under the neutron beam tracer parameter measurement and experimental applications provide a reference.