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400 MeV/u碳离子打靶的屏蔽参数计算

Shielding Data for 400 MeV/u 12C Ions on Iron and Water Targets

    摘要
  • 摘要: 为了给医用重离子加速器提供一种专用的快速计算屏蔽厚度或对蒙特卡罗模拟结果进行验证的方法。采用FLUKA程序完成了400 MeV/u碳离子打不同靶的屏蔽参数计算。首先研究了打厚靶(铁、水)产生的次级辐射场的角度分布及主要成分；接着给出了不同角度范围下周围剂量当量在屏蔽体中的衰减曲线，通过拟合数据进一步得到不同角度范围下的辐射源项值H0和衰减长度λ0；最后结合莆田市医用重离子加速器治疗室的屏蔽设计，介绍了此套屏蔽参数的使用方法，通过与蒙特卡罗模拟结果的对比，证明了这套屏蔽参数的可靠性。该参数可为同类医用重离子加速器的屏蔽设计提供可靠的参考数据。

     

    Abstract: In order to provide a special method for rapid calculation of shielding thickness or validation of results of Monte Carlo code simulation for medical heavy ion accelerator, FLUKA is employed to perform the calculation of shielding parameters for 400 MeV/u 12C ions on iron and water targets. Firstly, the angle distribution and main compositions of the secondary radiation are studied, and then the attenuation curves of the dose equivalent are given, and the radiation source term(H0) and attenuation length(λ0) are obtained by fitting the data. Finally, the shielding design of a treatment room of medical heavy ion accelerator in Putian is taken as an example to introduce the application of the shielding parameters. The comparison with the simulation results shows that the shielding parameters given in this paper are reliable. These parameters can provide reliable reference data for shielding design of similar medical heavy ion accelerators.

     

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