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.