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在X射线检查系统中,辐射防护中除了需要重点考虑透射和漏射外,散射的成分也必须考虑,而且散射的影响变得越来越重要,这一点在同方威视的固定式、组合式和车载式系统中都已经得到了体现。针对散射的问题,该文进行了系统的研究,提出了在Monte Carlo计算中采用散射标记方法分析各散射体对于散射的贡献,克服了传统方法无法准确计算某一点的散射剂量率以及各散射体对散射的贡献的局限,并利用实验进行了验证。该文采用的计算工具是Geant4软件包。结果表明,该文提出的方法是可行的,尤其在复杂系统的辐射防护优化设计中具有较好的指导作用。
In the X-ray inspection system, in addition to the radiation protection need to focus on transmission and leakage, the scattering of the composition must also be considered, and the impact of scattering becomes more and more important, which is in the same side of Viagra fixed, modular And vehicle-mounted systems have already been reflected. In order to solve the problem of scattering, this paper conducts a systematic research and proposes the use of scatter labeling method to analyze the contribution of scatterers to scattering in Monte Carlo calculations. It overcomes the problem that the traditional method can not accurately calculate the scattering dose rate and the scatterers The contribution to scattering is limited and validated experimentally. The calculation tool used in this paper is Geant4 software package. The results show that the proposed method is feasible, especially for the optimization design of radiation protection in complex systems.