• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Radiation Biology: Covering the Physical, Chemical, Biological, and Medical Effects of Ionizing and Non-ionizing Radiations >Absorbed fraction of radon progeny in human bronchial airways with bifurcation geometry.
【24h】

Absorbed fraction of radon progeny in human bronchial airways with bifurcation geometry.

机译：具有分支几何形状的人支气管气管中ra子体的吸收分数。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

PURPOSE: The absorbed fraction, defined as the portion of the initial particle energy which is absorbed in the tissue of interest, was calculated, under bifurcation geometry of the airway tubes, for alpha-particles emitted from radon progeny in the human respiratory tract. The results are given for all branching generations and compared with the data obtained for the commonly used infinite straight cylinders adopted by the International Commission on Radiological Protection (ICRP) Report 66. MATERIALS AND METHODS: A model was created to calculate the absorbed fraction of alpha-particle energy in the human lung using bifurcation geometry. Monte Carlo simulations of alpha-particle propagation in tissue and air were performed. The stopping powers of alpha-particles were adopted from the International Commission of Radiation Units and Measurements (ICRU) Report 49. RESULTS: The absorbed fractions for the bifurcation geometry are given for the 15 generations in the tracheobronchial tree for alpha-particle energies of 6 and 7.69 MeV. The sources were assumed to be the fast and slow moving mucus. CONCLUSIONS: Comparisons with ICRP66 data reveal that the assumption of long, straight cylinders was appropriate in some cases, but not in all. Adoption of the absorbed fractions obtained from the bifurcation model instead of the ICRP66 data caused 'redistribution' of doses in the bronchial (BB) and bronchiolar (bb) regions.
机译：目的：在呼吸道的分叉几何形状下，计算从人体呼吸道中的ra子产生的α-粒子的吸收分数，该分数定义为感兴趣组织中吸收的初始粒子能量的一部分。给出了所有分支代的结果，并与国际放射防护委员会（ICRP）报告66所采用的常用无限直圆柱体获得的数据进行了比较。材料与方法：建立了一个模型来计算α的吸收分数使用分叉几何结构在人肺中获得-粒子能量。进行了组织和空气中α粒子传播的蒙特卡罗模拟。国际辐射单位和测量委员会（ICRU）报告49采用了α粒子的阻止能力。结果：气管支气管树中15代给出了分叉几何的吸收分数，α粒子能量为6。和7.69 MeV。来源被认为是快速和缓慢移动的粘液。结论：与ICRP66数据的比较表明，在某些情况下（但并非在所有情况下）采用长直圆柱体是合适的。采用从分叉模型获得的吸收级分代替ICRP66数据，导致剂量在支气管（BB）和支气管（bb）区域“重新分布”。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号