【摘要】 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。更多还原

【Abstract】 A new method was developed to measure the neutron albedo by the Monte Carlo code and the activation method. The total neutron fluence at various places on the capture apparatus’ surface was measured by the activation method, and the fluence ratios of incident to reflected neutrons at these places were calculated by MCNP. The meas- urement results were modified by the calculation and an important parameter “neutron albedo” upon the capture ap- paratus was obtained. This parameter would provide a reference for the parameter’s measurement and practical appli- cation of thermal neutron radiography in the pulsed reactors.更多还原