Estimation of absorbed and equivalent doses of photon radiation in thin layers

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• 作者：A. V. Belousov ; A. A. Kalachev ; G. A. Krusanov…
• 关键词：Geant4 ; thin layers ; photonuclear reactions ; bremsstrahlung
• 刊名：Moscow University Physics Bulletin
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：70
• 期：5
• 页码：416-422
• 全文大小：638 KB
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• 作者单位：A. V. Belousov (1)
  A. A. Kalachev (1)
  G. A. Krusanov (1)
  A. P. Chernyaev (1)
  
  1. Department of Physics, Moscow State University, Moscow, 119991, Russia
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mathematical and Computational Physics
  Russian Library of Science
  
• 出版者：Allerton Press, Inc. distributed exclusively by Springer Science+Business Media LLC
• ISSN：1934-8460

文摘

This study is devoted to the investigation of the interaction of photon radiation with an energy of up to 30 MeV with thin layers, which simulates the conditions of radiobiological experiments on determination of the relative biological efficiency (RBE). The values of the absorbed dose of all of the produced particles in irradiated layers were determined via computer simulation using Geant4 and the equivalent dose was calculated. Computer experiments were performed in media of different elemental compositions: water and model biological tissue. We demonstrate that starting from the threshold of photonuclear reactions on light elements the equivalent dose of monochromatic radiation differs from the absorbed dose by a factor of 3-5 depending on the layer thickness and composition. Similar calculations for bremsstrahlung spectra also demonstrate a noticeable difference between the absorbed and equivalent doses in a layer. Keywords Geant4 thin layers photonuclear reactions bremsstrahlung