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为解决研究堆的屏蔽计算问题 ,讨论了应用 MonteCarlo方法的 MCNP程序进行反应堆的屏蔽计算 ,引入了结合抽样技术的 MCNP分步计算的方法。该方法特别适用于计算物理模型比较大 ,屏蔽层比较厚 ,粒子的穿透距离比较长的问题。在这一类的问题中 ,单步计算根本无法计算出结果 ,利用分步计算和抽样技术则能在较短的时间内以较高的精度 (统计误差小于 10 % )得出结果。结合抽样技术的MCNP分步计算方法能够很好地解决深穿透问题
In order to solve the problem of the research reactor shielding calculation, the MCNP procedure using Monte Carlo method is discussed to calculate the shielding of the reactor, and the MCNP step-by-step calculation method based on the sampling technique is introduced. The method is particularly suitable for calculating the physical model is relatively large, relatively thick shielding layer, the longer the particle penetration problem. In this type of problem, single-step calculations can not calculate the results at all, and using fractional and sampling techniques yields results with higher accuracy (less than 10% statistical error) in a shorter period of time. The MCNP step-by-step calculation method combined with sampling technique can well solve the problem of deep penetration