Kerma and photons absorbed-dose from Ir-192 HDR seeds

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Precise calculations of absorbed dose (AD) are a difficult task involving physical phenomena such as emission, transport, and absorption of radiation. We used the Monte Carlo method to calculate Kerma as well as AD in water imparted by two different Ir-192 HDR brachytherapy seeds (Flexisource and mi...

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Autores principales: Chesta, Miguel Ángel, Poma, Ana Lucía, Mc Donnell, Dionisio José
Formato: article
Lenguaje:Inglés
Publicado: 2022
Materias:
Photons absorbed dose
Kerma
HDR-Brachytherapy
Seed
Ir-192
Acceso en línea:http://hdl.handle.net/11086/23290
http://dx.doi.org/10.11648/j.ejb.20140206.11
Aporte de:
Repositorio Digital Universitario (UNC) de Universidad Nacional de Córdoba
id I10-R14111086-23290
record_format dspace
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-141
collection Repositorio Digital Universitario (UNC)
language Inglés
topic Photons absorbed dose
Kerma
HDR-Brachytherapy
Seed
Ir-192
spellingShingle Photons absorbed dose
Kerma
HDR-Brachytherapy
Seed
Ir-192
Chesta, Miguel Ángel
Poma, Ana Lucía
Mc Donnell, Dionisio José
Kerma and photons absorbed-dose from Ir-192 HDR seeds
topic_facet Photons absorbed dose
Kerma
HDR-Brachytherapy
Seed
Ir-192
description Precise calculations of absorbed dose (AD) are a difficult task involving physical phenomena such as emission, transport, and absorption of radiation. We used the Monte Carlo method to calculate Kerma as well as AD in water imparted by two different Ir-192 HDR brachytherapy seeds (Flexisource and microSelectron-v2) taking into account the AAPM TG-43 formalism and AAPM & ESTRO most recent reports recommendations. The aim of this work is to evaluate when can Kerma be used as a measurement of AD for this type of seeds. Thus, we analyse the behaviour of both quantities in whole space, putting special emphasis near the source surface. We carried out calculations using microvoxels to obtain high spatial resolution of data close to the source. We observed differences of up to 6 % between AD and Kerma within 1 mm around the seed, and less than 1 % in any other region of the phantom. This allows us to analyse build-up region for Ir-192 HDR brachytherapy seeds. As it will be further discussed in this paper, our results can be explained in terms of partial electronic equilibrium reached on different regions of the phantom. Both seeds showed common overall behaviour, providing generality to the conclusions drawn. The complete bearing of the radial dose function (defined in the TG43 formalism) as it traverses the surface of the seed is reported. Whenever comparisons are possible, our results are in agreement with those reported by other authors. Tables of radial dose function, including new data computed from AD rate (instead of Kerma rate), are presented.
format article
author Chesta, Miguel Ángel
Poma, Ana Lucía
Mc Donnell, Dionisio José
author_facet Chesta, Miguel Ángel
Poma, Ana Lucía
Mc Donnell, Dionisio José
author_sort Chesta, Miguel Ángel
title Kerma and photons absorbed-dose from Ir-192 HDR seeds
title_short Kerma and photons absorbed-dose from Ir-192 HDR seeds
title_full Kerma and photons absorbed-dose from Ir-192 HDR seeds
title_fullStr Kerma and photons absorbed-dose from Ir-192 HDR seeds
title_full_unstemmed Kerma and photons absorbed-dose from Ir-192 HDR seeds
title_sort kerma and photons absorbed-dose from ir-192 hdr seeds
publishDate 2022
url http://hdl.handle.net/11086/23290
http://dx.doi.org/10.11648/j.ejb.20140206.11
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