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中文摘要：
为使MCNP程序能模拟数百万规模的反应堆＂pin-by-pin＂问题和医学体素模型,本文对MCNP程序进行了改进,使几何块、几何面数量可扩展。改进后的程序对硼中子俘获治疗（BNCT）的人体大脑进行几何建模,栅元数量达百万量级;计算了大脑的中子、光子吸收剂量率随深度的变化,为大脑BNCT提供理论支持。此外,对百万规模的＂Like n But＂重复结构模型进行了串、并行测试,验证了几何规模扩展后程序计算的正确性。
英文摘要：
To set up models for ＇pin-by-pin＇ facilities（reactors） and human phantoms with millions of cells by using the MCNP code,the MCNP code was modified and limits on the number of cell,surface,material,etc.were extended.The Snyder head phantom for boron neutron capture therapy was modeled.Neutron and induced gamma-ray absorbed dose in human brain was calculated.Besides,a critical calculation model of repeated structures described by the ＇Like n But＇ cards was calculated employing both series and parallel computing.As a conclusion,modifications of the MCNP code were proved to be correct.
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