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应兰州大学１４ＭｅＶ中子治癌机中治疗头屏蔽体的设计需要，利用Ｍｏｎｔｅ Ｃａｒｌｏ方法（ＭＣＮＰ程序）模拟计算了一个复合屏蔽的（采用１００ｃｍ源皮距下，国际上一般采用１００—１２０ｃｍ）中子输运过程，计算了 １４ＭｅＶ快中子源在复合屏蔽的不同组合时的透射剂量率，优化设计了最经济实用的屏蔽体的方案，为治疗头的屏蔽设计提供了可靠的科学依据。
To design a shield for the treatment of 14 MeV neutron cancer treatment machine at Lanzhou University, a Monte Carlo method (MCNP program) was used to simulate and calculate a composite shield (using a 100 cm source skin distance, the international generally used 100-120 cm) In the sub-transport process, the transmission dose rate of the 14 MeV fast neutron source in different combinations of composite shields was calculated, and the most economical and practical shield design was optimized, providing a reliable scientific basis for the shield design of the treatment head.