Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope

n this work we calculate the beam quality correction factor ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ for various plane-parallel ionization chambers. A set of Monte Carlo calculations using the code penelope/penEasy have been carried out to calculate the overall correction factor fc,Q for eight electron b...

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Detalles Bibliográficos
Autores: Erazo, F., Brualla, L., Lallena, A. M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:Ecuador
Institución:Universidad de Cuenca
Repositorio:Repositorio Universidad de Cuenca
Idioma:inglés
OAI Identifier:oai:dspace.ucuenca.edu.ec:123456789/22005
Acceso en línea:http://dspace.ucuenca.edu.ec/handle/123456789/22005
Access Level:acceso abierto
Palabra clave:Ionization
Electron
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spelling Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelopePhysics in Medicine and BiologyErazo, F.Brualla, L.Lallena, A. M.IonizationElectronn this work we calculate the beam quality correction factor ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ for various plane-parallel ionization chambers. A set of Monte Carlo calculations using the code penelope/penEasy have been carried out to calculate the overall correction factor fc,Q for eight electron beams corresponding to a Varian Clinac 2100 C/D, with nominal energies ranging between 6 MeV and 22 MeV, for a 60Co beam, that has been used as the reference quality Q0 and also for eight monoenergetic electron beams reproducing the quality index R50 of the Clinac beams. Two field sizes, 10 × 10 cm2 and 20 × 20 cm2 have been considered. The ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ factors have been calculated as the ratio between fc,Q and ${{f}_{\text{c},{{\text{Q}}_{0}}}}$ . Values for the Exradin A10, A11, A11TW, P11, P11TW, T11 and T11TW ionization chambers, manufactured by Standard Imaging, as well as for the NACP-02 have been obtained. The results found with the Clinac beams for the two field sizes analyzed show differences below 0.6%, even in the case of the higher energy electron beams. The ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ values obtained with the Clinac beams are 1% larger than those found with the monoenergetic beams for the higher energies, above 12 MeV. This difference can be ascribed to secondary photons produced in the linac head and the air path towards the phantom. Contrary to what was quoted in a previous work (Sempau et al 2004 Phys. Med. Biol. 49 4427–44), the beam quality correction factors obtained with the complete Clinac geometries and with the monoenergetic beams differ significantly for energies above 12 MeV. Material differences existing between chambers that have the same geometry produce non-negligible modifications in the value of these correction factors.Cuencavolumen 59: número 212015-06-10T15:20:32Z2015-06-10T15:20:32Z2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://dspace.ucuenca.edu.ec/handle/123456789/22005doi: 10.1088/0022-3727/59/21/6673enghttp://creativecommons.org/licenses/by-nc-sa/3.0/ec/info:eu-repo/semantics/openAccessreponame:Repositorio Universidad de Cuencainstname:Universidad de Cuencainstacron:UCUENCA2020-08-01T01:11:28Zoai:dspace.ucuenca.edu.ec:123456789/22005Institucionalhttp://dspace.ucuenca.edu.ec/Universidad públicahttps://www.ucuenca.edu.ec/http://dspace.ucuenca.edu.ec/oai.Ecuador...opendoar:41862020-08-01T01:11:28Repositorio Universidad de Cuenca - Universidad de Cuencafalse
dc.title.none.fl_str_mv Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
Physics in Medicine and Biology
title Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
spellingShingle Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
Erazo, F.
Ionization
Electron
title_short Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
title_full Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
title_fullStr Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
title_full_unstemmed Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
title_sort Electron beam quality kQ,Q0 factors for various ionization chambers: a Monte Carlo investigation with penelope
dc.creator.none.fl_str_mv Erazo, F.
Brualla, L.
Lallena, A. M.
author Erazo, F.
author_facet Erazo, F.
Brualla, L.
Lallena, A. M.
author_role author
author2 Brualla, L.
Lallena, A. M.
author2_role author
author
dc.subject.none.fl_str_mv Ionization
Electron
topic Ionization
Electron
description n this work we calculate the beam quality correction factor ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ for various plane-parallel ionization chambers. A set of Monte Carlo calculations using the code penelope/penEasy have been carried out to calculate the overall correction factor fc,Q for eight electron beams corresponding to a Varian Clinac 2100 C/D, with nominal energies ranging between 6 MeV and 22 MeV, for a 60Co beam, that has been used as the reference quality Q0 and also for eight monoenergetic electron beams reproducing the quality index R50 of the Clinac beams. Two field sizes, 10 × 10 cm2 and 20 × 20 cm2 have been considered. The ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ factors have been calculated as the ratio between fc,Q and ${{f}_{\text{c},{{\text{Q}}_{0}}}}$ . Values for the Exradin A10, A11, A11TW, P11, P11TW, T11 and T11TW ionization chambers, manufactured by Standard Imaging, as well as for the NACP-02 have been obtained. The results found with the Clinac beams for the two field sizes analyzed show differences below 0.6%, even in the case of the higher energy electron beams. The ${{k}_{\text{Q},{{\text{Q}}_{0}}}}$ values obtained with the Clinac beams are 1% larger than those found with the monoenergetic beams for the higher energies, above 12 MeV. This difference can be ascribed to secondary photons produced in the linac head and the air path towards the phantom. Contrary to what was quoted in a previous work (Sempau et al 2004 Phys. Med. Biol. 49 4427–44), the beam quality correction factors obtained with the complete Clinac geometries and with the monoenergetic beams differ significantly for energies above 12 MeV. Material differences existing between chambers that have the same geometry produce non-negligible modifications in the value of these correction factors.
publishDate 2014
dc.date.none.fl_str_mv 2014
2015-06-10T15:20:32Z
2015-06-10T15:20:32Z
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://dspace.ucuenca.edu.ec/handle/123456789/22005
doi: 10.1088/0022-3727/59/21/6673
url http://dspace.ucuenca.edu.ec/handle/123456789/22005
identifier_str_mv doi: 10.1088/0022-3727/59/21/6673
dc.language.none.fl_str_mv eng
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dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by-nc-sa/3.0/ec/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/3.0/ec/
eu_rights_str_mv openAccess
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