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MCNP模拟月表关键性元素γ射线与实测结果比较分析
Monte Carlo Simulation and Analysis of γ Rays for the Imp ortant Elements of Lunar Surface
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摘要: 嫦娥一号携带的γ射线谱仪传回大量能谱数据，对其分析与解谱是一个比较复杂的过程。针对此问题，提出按照月表γ射线来源的物理过程，分为月球表面天然放射元素、中子非弹性散射和中子俘获三部分。用MCNP程序模拟其在GRS中的能谱数据，将模拟结果叠加并与实测谱线对比，结果表明，模拟γ谱线能帮助辨识出实测谱线中的部分关键元素，例如40 K、214 Bi等。Abstract: It is a more complex data processing problem of the data ofγ-ray spectrum, which were collected by Chang’E-1 from lunar surface. It is presented that MCNP simulation for theγ spectra, according to three kinds of physical events, such as natural radioactive elements emission, theγ rays induced by inelastic neutron scattering and neutron capture on the lunar surface in this paper. The simulated results were superimposed and compared with the measured spectrum by Chang’E-1. The results show that 40K and 214Bi can be identified from the measured data with our MCNP models.
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