Monte Carlo散射标记方法在辐射防护设计中的应用

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。

Monte Carlo sign-scatter method for radioprotection design

In X-ray inspection systems,radiological protection design must consider scattering as well as transmission and leakage.Transmission and leakage can be easily shielded because they are emitted at known locations.However,the sources of scattered rays or the resulting dose rates at the boundary are not known.The scattering of X-rays was analyzed using the sign-scatter method based on the Geant4 Monte Carlo platform.The method can locate the sources of scattered rays and determine their contributions to the dose rate.The calculated results agree well with the experimental data,which shows that the method provides a guidance in radiological protection design of complex systems.