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用中子源模拟粒子加速器，以ＭＯＲＳＥ程序分析计算由于天空反散射引起的中子剂量当量的变化规律，揭示了天空反散射的实质，计算结果可供加速器或核设施环境评价和防护设计使用．计算模型采用将中子源置于空心圆柱体中，圆柱体分为有顶盖屏蔽和无顶盖屏蔽两种情况．中子源能量分别为２．３８ＭｅＶ、１４ＭｅＶ和巨共振中子．中子源为各向同性．此外，还分析计算了不同的发射立体角和不同散射介质的影响．
The particle accelerator is simulated by neutron source. The variation of neutron dose equivalent due to sky backscattering is analyzed by MORSE program, and the essence of sky backscattering is revealed. The calculation result can be used for environmental assessment and protection design of accelerator or nuclear facility. The computational model uses the neutron source to be placed in a hollow cylinder. The cylinder is divided into two types: covered and non-covered. The neutron source energies are 2.38MeV, 14MeV and giant resonance neutrons respectively. The neutron source is isotropic. In addition, the influence of different emission solid angles and different scattering media is analyzed and calculated.