Monte Carlo simulation and experimental investigation of 125I interseed dose attenuation
10.3760/cma.j.issn.0254-5098.2015.05.019
- VernacularTitle:基于实验与蒙特卡罗模拟法探究125I粒子间剂量衰减
- Author:
Zhi LI
;
Shan JIANG
;
Zhiyong YANG
;
Hongsheng BAI
;
Xingfu ZHANG
- Publication Type:Journal Article
- Keywords:
Brachytherapy;
125I seed;
dose attenuation;
Geant 4;
Monte Carlo
- From:
Chinese Journal of Radiological Medicine and Protection
2015;35(5):389-392
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the interseed dose attenuation for multiple 125I seeds.Methods Monte Carlo simulation was done by Geant 4 to investigate the dose distribution of single seed and multiple seeds.The results were compared with the dose calculation method from TG43-U1 and examined by experiments.Results The difference of single seed dose distribution between Monte Carlo method and line source model was ± 3％.The difference between Monte Carlo method and experiment result was ± 5％.The interseed dose attenuation of multiple seeds at the interesting points was 3.8％ to 13.2％ and the average interseed dose attenuation was 7.2％.The difference of experiment result and Monte Carlo result was less than 6％.Conclusions The interseed attenuation is about 7％ and the maximum value may be larger than 13％ for multiple seeds.The interseed dose attenuation may be larger in tissue.So it is not accurate to calculate the dose distribution by using TG43-U1.
