【摘要】 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。更多还原

【Abstract】 According to the design need of the shielding of therapy head in the 14MeV neutron therapy system of Lanzhou University, this paper simulated the transfer process of neutron at a source to body surface distance of 100cm by Monte Carlo method (mcnp3b). The dose transmissivity of fast neutron on the complex shielding of various combination was calculated. Optimum scheme of shielding was designed. It supplied a scientific basis for the design of therapy head.更多还原