高能~(56)Fe离子入射屏蔽材料的次级粒子模拟分析
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摘要
空间辐射环境下的高能重离子入射屏蔽材料会产生大量次级粒子,为研究屏蔽材料产生的次级粒子对太空舱内辐射环境的影响,本文使用基于蒙特卡罗方法的Geant4软件模拟空间高能~(56)Fe离子入射铝、碳、聚乙烯、水4种屏蔽材料,分析透射屏蔽体的初级粒子及由屏蔽材料产生的次级电子、次级中子、次级质子和次级γ的能谱以及水吸收体中的能量沉积和深度剂量分布。分析产生的次级重粒子类型和能量,比较4种屏蔽材料对高能Fe离子的屏蔽性能。结果表明,聚乙烯材料对高能重离子的屏蔽性能最好,但同时产生的次级重粒子的能量最大,约为铝材料产生次级重粒子能量的4倍。屏蔽体产生所有次级粒子中,次级质子和原子序数为22-26的次级重粒子贡献最大。
Background: The heavy ion in the galaxy cosmos rays with extremely high energy can be fatal to the astronaut and electronic device in the spacecraft. Purpose: This study aims to analyze the secondary particles produced by high energy heavy ion inject shielding materials of spacecraft. Methods: Based on the Monte-Carlo method simulation software Geant4, 1-Ge V·u~(-156) Fe ion incident four kinds of shielding material aluminum,aluminum carbon, polyethylene and water with 1.35-g·cm~(-2) mass thickness have been studied. The energy deposition in the absorber and deep-dose distribution produced by the transmitted primary particles and secondary electrons, secondary neutrons, secondary protons and secondary gamma have been analyzed. All produced secondary heavy particles and energies from four kinds of shielding materials after injected high-energy 1-Ge V·u~(-156) Fe ion have been investigated, and the shielding performance was analyzed and compared.Results: Polyethylene material absorbs the most energy, thus preservebest shielding performance whilst majority of secondary particlesand energies are produced. The energy of secondary heavy ion is quadruple of that producedby aluminum material.Conclusion: Amongall the secondary particles, secondary protons and secondary heavy ionswithatom number between 22 and 26 make the maximal contributions.
Background: The heavy ion in the galaxy cosmos rays with extremely high energy can be fatal to the astronaut and electronic device in the spacecraft. Purpose: This study aims to analyze the secondary particles produced by high energy heavy ion inject shielding materials of spacecraft. Methods: Based on the Monte-Carlo method simulation software Geant4, 1-Ge V·u~(-156) Fe ion incident four kinds of shielding material aluminum,aluminum carbon, polyethylene and water with 1.35-g·cm~(-2) mass thickness have been studied. The energy deposition in the absorber and deep-dose distribution produced by the transmitted primary particles and secondary electrons, secondary neutrons, secondary protons and secondary gamma have been analyzed. All produced secondary heavy particles and energies from four kinds of shielding materials after injected high-energy 1-Ge V·u~(-156) Fe ion have been investigated, and the shielding performance was analyzed and compared.Results: Polyethylene material absorbs the most energy, thus preservebest shielding performance whilst majority of secondary particlesand energies are produced. The energy of secondary heavy ion is quadruple of that producedby aluminum material.Conclusion: Amongall the secondary particles, secondary protons and secondary heavy ionswithatom number between 22 and 26 make the maximal contributions.
引文
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11 Jalota S,Kumar A.Comparative study of depth dose-distributions and partial fragmentation cross sections of 56Fe ions on polyethylene using Geant4[J].Nuclear Instruments and Methods in Physics Research B,2014,328(5):8-13.DOI:10.1016/j.nimb.2014.02.017
12 Kumar A,Jalota S,Gupta R.Simulation of depth-dose distributions for various ions in polyethylene medium[J].Advances in Space Research,2012,49(12):1691-1697.DOI:10.1016/j.asr.2012.03.013
13 Lembit S,Deter S,Tatsuaki K.Depth-dose distributions of high-energy carbon,oxygen and neon beams in water[J].Japanese Journal of Medical Physics,1998,18(1):1-21.DOI:10.11323/jjmp1992.18.1_1
14 Gudowsda I,Andreo P,Sobolevsky N.Secondary particle production in tissue-like and shielding materials for light and heavy ions calculated with the Monte-Carlo code shield-hit[J].Journal of Radiation Research,2002,43(3):93-97.DOI:10.1269/jrr.43.S93
15 Armstrong TW,Colborn BL.Predictions of secondary neutrons and their importance to radiation effects inside the international space station[J].Radiation Measurements,2001,33(3):229-234.DOI:10.1016/s1350-4487(00)00152-9
2 Durante M,Cucinotta F.Physical basis of radiation protection in space travel[J].Reviews of Modern Physics,2011,83(4):1245-1281.DOI:10.1103/Rev Mod Phys.83.1245
3方美华,魏志勇,杨浩.高能铁离子在水介质中核反应过程所导致的能量沉积[J].物理学报,2008,57(10):6196-6201.DOI:10.7498/aps.57.6196FANG Meihua,WEIZhiyong,YANG Hao.The energy deposit of high energy Fe ions inject in water due to nuclear reaction[J].Acta Physica Sinica,2008,57(10):6196-6201.DOI:10.7498/aps.57.6196
4 Apostolakis J,Asai M,Bogdanov AG.Geometry and physics of the Geant4 toolkit for high and medium energy applications[J].Radiation Physics and Chemistry,2009,78(10):859-873.DOI:10.1016/j.radphyschem.2009.04.02
5 Agostinelli S,Allison J,Amako K.Geant4-a simulation toolkit[J].Nuclear Instruments and Methods in Physics Research Section A,2003,506(3):250-303.DOI:10.1016/S0168-9002(03)01368-8
6 Guetersloh S,Zeitlin C,Heilbronn L.Polyethylene as a radiation shielding standard in simulated cosmic-ray environments[J].Nuclear Instruments and Methods in Physics Research Section B,2006,252(3):319-332.DOI:10.1016/j.nimb.2006.08.019
7 Zeitlin C,Guetersloh SB,Heilbronn LH.Measurements of materials shield properties with 1Ge V·nec56Fe[J].Nuclear Instruments and Methods in Physics Research A,2006,252(2):308-318.DOI:10.1016/j.nimb.2006.08.011
8姚志明,宋顾周,黑东炜.Geant4模拟1.6 Ge V质子的输运过程[J].核技术,2014,37(3):030205.DOI:10.11889/j.0253-3219.2014.hjs.37.030205YAO Zhiming,SONG Guzhou,HEI Dongwei.Research on 1.6-Ge V proton translation process using Geant4[J].Nuclear Techniques,2014,37(3):030205.DOI:10.11889/j.0253-3219.2014.hjs.37.030205
9 Geant4.Geant4 physics reference manual[EB].2015-2-5[2015-7-18].http://geant4.web.cern.ch/geant4/support/user documents.shtml
10 Jalota S,Kumar A.Validation of Geant4 physics models for 56Fe ion beam in various media[J].Nuclear Instruments and Methods in Physics Research B,2012,29(10):7-11.DOI:10.1016/j.nimb.2012.08.026
11 Jalota S,Kumar A.Comparative study of depth dose-distributions and partial fragmentation cross sections of 56Fe ions on polyethylene using Geant4[J].Nuclear Instruments and Methods in Physics Research B,2014,328(5):8-13.DOI:10.1016/j.nimb.2014.02.017
12 Kumar A,Jalota S,Gupta R.Simulation of depth-dose distributions for various ions in polyethylene medium[J].Advances in Space Research,2012,49(12):1691-1697.DOI:10.1016/j.asr.2012.03.013
13 Lembit S,Deter S,Tatsuaki K.Depth-dose distributions of high-energy carbon,oxygen and neon beams in water[J].Japanese Journal of Medical Physics,1998,18(1):1-21.DOI:10.11323/jjmp1992.18.1_1
14 Gudowsda I,Andreo P,Sobolevsky N.Secondary particle production in tissue-like and shielding materials for light and heavy ions calculated with the Monte-Carlo code shield-hit[J].Journal of Radiation Research,2002,43(3):93-97.DOI:10.1269/jrr.43.S93
15 Armstrong TW,Colborn BL.Predictions of secondary neutrons and their importance to radiation effects inside the international space station[J].Radiation Measurements,2001,33(3):229-234.DOI:10.1016/s1350-4487(00)00152-9