Absorbed dose ratio factor of Al<sub>2</sub>O<sub>3</sub> in 6 MV radiotherapeutic beams

CHEN Shaowen1; 2 WANG Xuetao1; 3 CHEN Lixin4 TANG Qiang1 LIU Xiaowei1 1

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Absorbed dose ratio factor of Al₂O₃ in 6 MV radiotherapeutic beams

更新时间：2021-03-12

- Absorbed dose ratio factor of Al₂O₃ in 6 MV radiotherapeutic beams
- NUCLEAR TECHNIQUES Vol. 32, Issue 7, (2009)
- 作者机构：
  
  1. 中山大学物理科学与工程技术学院
  2. 东莞理工学院
  3. 广东省中医院
  4. 中山大学肿瘤防治中心
- 作者简介：
- 基金信息：
  
  国家自然科学基金(10675175、10505033、10674033)资助
- DOI：
  CLC： R144.1
- Published：01 July 2009
- 稿件说明：
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[1]陈少文,王学涛,陈立新,唐强,刘小伟.Al_2O_3在6MV放疗射线中的吸收剂量比率因子[J].核技术,2009,32(07):529-532.

CHEN Shaowen1, 2 WANG Xuetao1, 3 CHEN Lixin4 TANG Qiang1 LIU Xiaowei1 1. Absorbed dose ratio factor of Al₂O₃ in 6 MV radiotherapeutic beams[J]. Nuclear techniques, 2009, 32(7): 529-532.
[1]陈少文,王学涛,陈立新,唐强,刘小伟.Al_2O_3在6MV放疗射线中的吸收剂量比率因子[J].核技术,2009,32(07):529-532. DOI：

CHEN Shaowen1, 2 WANG Xuetao1, 3 CHEN Lixin4 TANG Qiang1 LIU Xiaowei1 1. Absorbed dose ratio factor of Al₂O₃ in 6 MV radiotherapeutic beams[J]. Nuclear techniques, 2009, 32(7): 529-532. DOI：

摘要

用EGSnrc/BEAMnrc、DOSXYZnrc、DOSRZnrc模拟计算水体模中Al2O3剂量计的吸收剂量和剂量计对应位置上水的实际吸收剂量

并计算吸收剂量比率因子fmd

讨论Al2O3剂量计的吸收剂量特性。剂量计为Φ4mm×1mm的Al2O3薄片

计算深度0.5-8.0cm

放疗射线是Varian 600C医用电子直线加速器的6MV射线和Mohan 6MV谱线。结果表明:Al2O3剂量计的吸收剂量少于对应位置上水的实际吸收剂量

吸收剂量比率因子fmd与剂量计在体模中的深度有关

在剂量建成区内fmd对剂量计深度变化敏感;在建成区外fmd受剂量计深度变化的影响很小

用平均值表示不同深度的fmd时偏差不大于1.0%。

Abstract

The EGSnrc Monte Carlo codes of BEAMnrc

DOSXYZnrc and DOSRZnrc were used to simulate absorbed dose of an Al2O3 dosimeter and absorbed dose of the equivalent water volume in corresponding position irradiated by radiotherapeutic Varian 600C 6 MV beams and Mohan 6 MV spectrum in a water phantom.The absorbed dose ratio factor fmd was calculated

and dosimetry characteristics of the Al2O3 dosimeter were discussed.Simulations were done for a cylindrical geometry dosimeter(Φ4 mm×1 mm) and the dosimeter was at the centre of the water phantom at different depths of 0.5-8.0 cm.The results reveal that the absorbed dose of the Al2O3 dosimeter is less than that of the equivalent water.The absorbed dose ratio factor is dependent on the dosimeter depth in the phantom.In the buildup region the absorbed dose ratio factor fmd is sensitive to the depth of the dosimeter.Over the buildup region fmd is insensitive to the depth.This allows the use of averaged absorbed dose ratio factor without introducing discrepancies more than 1.0%.

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Absorbed dose ratio factor of Al2O3 in 6 MV radiotherapeutic beams

DOI：

摘要

Abstract

关键词

Keywords

references

Absorbed dose ratio factor of Al₂O₃ in 6 MV radiotherapeutic beams