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Geant4 Based Space Radiation Application for Planar and Spherical Geometries

Received: 4 November 2017     Accepted: 17 November 2017     Published: 18 December 2017
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Abstract

A space radiation application is developed based on Geant4 tool kit. Even though there are many space radiation applications like MULASSIS (MUlti-LAyered Shielding SImulation Software); the application developed here offers more flexibility in choosing the physical models. It can be used to analyze the spherical geometries directly in addition to the planar geometries. In this paper both planar and spherical geometries of aluminum (Al), polyethylene (CH2) and liquid hydrogen (lH2) materials are analyzed with the help of dose-depth curves. The hydrogen, helium and Fe particle spectra of Galactic Cosmic Radiation (GCR) radiation are used in the estimation of doses. The total equivalent doses for the periods of 1 Yr are evaluated for aluminum, polyethylene and liquid hydrogen materials respectively and the liquid hydrogen is found to be more effective shielding material. These doses are compared to NCRP 2000 (National Council on Radiation Protection and Measurements) career dose limits to analyze the radiation risk for astronauts. The doses in case of planar geometries are well below the career limits of male as well female astronauts of age 35Yrs but those that in case of spherical geometries are well above the career limits for female astronauts of the same age. Doses for spherical geometries are below the career limits of male astronauts of same age only when areal densities of shield materials reach 100g/cm2. The dose in spherical geometry is found to be ~4.4 times to that of planar geometry when Al material of 10 g/cm2 is exposed to GCR hydrogen spectrum. This is in agreement with the estimations of previous studies. The effect of geometry on the dose levels received by astronauts is also analyzed. It is found that the reduction in dose is about 10% more in spherical geometry than in planar geometry of the Al material. This is observed when the Al material is exposed to GCR hydrogen spectrum and its thickness is varied from 10 g/cm2 to 120 g/cm2.

Published in Advances in Applied Sciences (Volume 2, Issue 6)
DOI 10.11648/j.aas.20170206.13
Page(s) 110-114
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2017. Published by Science Publishing Group

Keywords

Space Radiation, Geant4, Solar Energetic Particles, Galactic Cosmic Rays, Dose, Equivalent Dose

References
[1] S. Agostinelli, J. Allison, K. Amako et al., GEANT4- a simulation toolkit, Nucl. Instr and Meth. A, 506 (2003) 250-303.
[2] J. Allison, K. Amako, J. Apostolakis et al., Geant4 developments and applications, IEEE Trans. Nucl. Sci., 53(1) (2006) 270-278.
[3] J. Apostolakis, M. Asai, A. G Bogdanov et al., Geometry and physics of the Geant4 toolkit for high and medium energy applications, Radiation Physics and Chemistry, 78 (2009) 859-873.
[4] Geant4. https://geant4.web.cern.ch/ [14 Oct 2015]
[5] M. Durante, and Francis A. Cucinotta, Physical basis of radiation protection in space travel, Rev. Mod. Phys, 83(4) (2011) 1245-1281.
[6] J. Bernabeu, I. Casanova, Geant4-based radiation hazard assessment for human exploration missions, Advances in Space Research, 40 (2007)1368-1380.
[7] F. Lei, P. R. Truscott, C. S. Dyer et al. MULASSIS: A Geant4-based Multilayered Shielding Simulation Tool, IEEE Transactions on Nuclear Science, 49(6) (2002) 2788 - 2793.
[8] SPENVIS. https://www.spenvis.oma.be/
[9] Allan J. Tylka, James H. Adams, Jr., Paul R. Boberg, et al., CRÈME 96: A revision of the Cosmic Ray Effects on Micro-Electronics Code, IEEE Transactions on Nuclear Science, 44(6) (1997) 2150-2160.
[10] CRÈME –MC. https://creme.isde.vanderbilt.edu
[11] ICRP1990 recommendations of the international commission on radiological protection, Tech. Rep. 60, International Commission on Radiological Protection (ICRP), New York, 1991.
[12] S. M. Seltzer, Conversion of depth-dose distributions from slab to spherical geometries for space-shielding applications, IEEE Transactions in Nuclear Science NS-33 (1986) 1292-1297.
Cite This Article
  • APA Style

    V. Satya Prakash. (2017). Geant4 Based Space Radiation Application for Planar and Spherical Geometries. Advances in Applied Sciences, 2(6), 110-114. https://doi.org/10.11648/j.aas.20170206.13

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    ACS Style

    V. Satya Prakash. Geant4 Based Space Radiation Application for Planar and Spherical Geometries. Adv. Appl. Sci. 2017, 2(6), 110-114. doi: 10.11648/j.aas.20170206.13

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    AMA Style

    V. Satya Prakash. Geant4 Based Space Radiation Application for Planar and Spherical Geometries. Adv Appl Sci. 2017;2(6):110-114. doi: 10.11648/j.aas.20170206.13

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  • @article{10.11648/j.aas.20170206.13,
      author = {V. Satya Prakash},
      title = {Geant4 Based Space Radiation Application for Planar and Spherical Geometries},
      journal = {Advances in Applied Sciences},
      volume = {2},
      number = {6},
      pages = {110-114},
      doi = {10.11648/j.aas.20170206.13},
      url = {https://doi.org/10.11648/j.aas.20170206.13},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.aas.20170206.13},
      abstract = {A space radiation application is developed based on Geant4 tool kit. Even though there are many space radiation applications like MULASSIS (MUlti-LAyered Shielding SImulation Software); the application developed here offers more flexibility in choosing the physical models. It can be used to analyze the spherical geometries directly in addition to the planar geometries. In this paper both planar and spherical geometries of aluminum (Al), polyethylene (CH2) and liquid hydrogen (lH2) materials are analyzed with the help of dose-depth curves. The hydrogen, helium and Fe particle spectra of Galactic Cosmic Radiation (GCR) radiation are used in the estimation of doses. The total equivalent doses for the periods of 1 Yr are evaluated for aluminum, polyethylene and liquid hydrogen materials respectively and the liquid hydrogen is found to be more effective shielding material. These doses are compared to NCRP 2000 (National Council on Radiation Protection and Measurements) career dose limits to analyze the radiation risk for astronauts. The doses in case of planar geometries are well below the career limits of male as well female astronauts of age 35Yrs but those that in case of spherical geometries are well above the career limits for female astronauts of the same age. Doses for spherical geometries are below the career limits of male astronauts of same age only when areal densities of shield materials reach 100g/cm2. The dose in spherical geometry is found to be ~4.4 times to that of planar geometry when Al material of 10 g/cm2 is exposed to GCR hydrogen spectrum. This is in agreement with the estimations of previous studies. The effect of geometry on the dose levels received by astronauts is also analyzed. It is found that the reduction in dose is about 10% more in spherical geometry than in planar geometry of the Al material. This is observed when the Al material is exposed to GCR hydrogen spectrum and its thickness is varied from 10 g/cm2 to 120 g/cm2.},
     year = {2017}
    }
    

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  • TY  - JOUR
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    AU  - V. Satya Prakash
    Y1  - 2017/12/18
    PY  - 2017
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    JO  - Advances in Applied Sciences
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    AB  - A space radiation application is developed based on Geant4 tool kit. Even though there are many space radiation applications like MULASSIS (MUlti-LAyered Shielding SImulation Software); the application developed here offers more flexibility in choosing the physical models. It can be used to analyze the spherical geometries directly in addition to the planar geometries. In this paper both planar and spherical geometries of aluminum (Al), polyethylene (CH2) and liquid hydrogen (lH2) materials are analyzed with the help of dose-depth curves. The hydrogen, helium and Fe particle spectra of Galactic Cosmic Radiation (GCR) radiation are used in the estimation of doses. The total equivalent doses for the periods of 1 Yr are evaluated for aluminum, polyethylene and liquid hydrogen materials respectively and the liquid hydrogen is found to be more effective shielding material. These doses are compared to NCRP 2000 (National Council on Radiation Protection and Measurements) career dose limits to analyze the radiation risk for astronauts. The doses in case of planar geometries are well below the career limits of male as well female astronauts of age 35Yrs but those that in case of spherical geometries are well above the career limits for female astronauts of the same age. Doses for spherical geometries are below the career limits of male astronauts of same age only when areal densities of shield materials reach 100g/cm2. The dose in spherical geometry is found to be ~4.4 times to that of planar geometry when Al material of 10 g/cm2 is exposed to GCR hydrogen spectrum. This is in agreement with the estimations of previous studies. The effect of geometry on the dose levels received by astronauts is also analyzed. It is found that the reduction in dose is about 10% more in spherical geometry than in planar geometry of the Al material. This is observed when the Al material is exposed to GCR hydrogen spectrum and its thickness is varied from 10 g/cm2 to 120 g/cm2.
    VL  - 2
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    ER  - 

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Author Information
  • Department of Physics, Government Degree College, Medak, India

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