Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques

Diffusion of ferric ions in ferrous sulfate (Fricke) gels represents one of the main drawbacks of some radiation detectors, such as Fricke gel dosimeters. In practice, this disadvantage can be overcome by prompt dosimeter analysis, and constraining strongly the time between irradiation and analysis,...

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Detalles Bibliográficos
Autores: Vedelago, José Alberto, Quiroga, Andrés Agustin Ignacio, Valente, Mauro Andres
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/31855
Acceso en línea:http://hdl.handle.net/11336/31855
Access Level:acceso abierto
Palabra clave:Fricke Gel Dosimetry
Ferric Ions Diffusion
Finite Elements Modeling
Radiotherapy
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
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network_acronym_str AR
network_name_str Argentina
repository_id_str
dc.title.none.fl_str_mv Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
title Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
spellingShingle Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
Vedelago, José Alberto
Fricke Gel Dosimetry
Ferric Ions Diffusion
Finite Elements Modeling
Radiotherapy
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
title_short Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
title_full Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
title_fullStr Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
title_full_unstemmed Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
title_sort Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques
dc.creator.none.fl_str_mv Vedelago, José Alberto
Quiroga, Andrés Agustin Ignacio
Valente, Mauro Andres
author Vedelago, José Alberto
author_facet Vedelago, José Alberto
Quiroga, Andrés Agustin Ignacio
Valente, Mauro Andres
author_role author
author2 Quiroga, Andrés Agustin Ignacio
Valente, Mauro Andres
author2_role author
author
dc.subject.none.fl_str_mv Fricke Gel Dosimetry
Ferric Ions Diffusion
Finite Elements Modeling
Radiotherapy
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
topic Fricke Gel Dosimetry
Ferric Ions Diffusion
Finite Elements Modeling
Radiotherapy
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
description Diffusion of ferric ions in ferrous sulfate (Fricke) gels represents one of the main drawbacks of some radiation detectors, such as Fricke gel dosimeters. In practice, this disadvantage can be overcome by prompt dosimeter analysis, and constraining strongly the time between irradiation and analysis, implementing special dedicated protocols aimed at minimizing signal blurring due to diffusion effects. This work presents a novel analytic modeling and numerical calculation approach of diffusion coefficients in Fricke gel radiation sensitive materials. Samples are optically analyzed by means of visible light transmission measurements by capturing images with a charge-coupled device camera provided with a monochromatic filter corresponding to the XO-infused Fricke solution absorbance peak. Dose distributions in Fricke gels are suitably delivered by assessing specific initial conditions further studied by periodical sample image acquisitions. Diffusion coefficient calculations were performed using a set of computational algorithms based on inverse problem formulation. Although 1D approaches to the diffusion equation might provide estimations of the diffusion coefficient, it should be calculated in the 2D framework due to the intrinsic bi-dimensional characteristics of Fricke gel layers here considered as radiation dosimeters. Thus a suitable 2D diffusion model capable of determining diffusion coefficients was developed by fitting the obtained algorithm numerical solutions with the corresponding experimental data. Comparisons were performed by introducing an appropriate functional in order to analyze both experimental and numerical values. Solutions to the second-order diffusion equation are calculated in the framework of a dedicated method that incorporates finite element method. Moreover, optimized solutions can be attained by gradient-type minimization algorithms. Knowledge about diffusion coefficient for a Fricke gel radiation detector is helpful in accounting for effects regarding elapsed time between dosimeter irradiation and further analysis. Hence, corrections might be included in standard dependence of optical density differences and actual, non-diffused, absorbed dose distributions. The obtained values for ferric ion diffusion coefficient are around 0.65 mm2 h−1, being in good agreement with previous works corresponding to similar Fricke gel dosimeter compositions. Therefore, more accurate 2D and 3D dose mapping might be attained, thus constituting valuable improvements in Fricke gel dosimetry, and parallely a high precision method of diffusion modeling and calculation has been developed.
publishDate 2014
dc.date.none.fl_str_mv 2014-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/31855
Valente, Mauro Andres; Quiroga, Andrés Agustin Ignacio; Vedelago, José Alberto; Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques; Taylor & Francis Ltd; Radiation Effects And Defects In Solids; 169; 10; 10-2014; 845-854
1042-0150
CONICET Digital
CONICET
url http://hdl.handle.net/11336/31855
identifier_str_mv Valente, Mauro Andres; Quiroga, Andrés Agustin Ignacio; Vedelago, José Alberto; Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques; Taylor & Francis Ltd; Radiation Effects And Defects In Solids; 169; 10; 10-2014; 845-854
1042-0150
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1080/10420150.2014.958749
info:eu-repo/semantics/altIdentifier/url/http://www.tandfonline.com/doi/abs/10.1080/10420150.2014.958749
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Taylor & Francis Ltd
publisher.none.fl_str_mv Taylor & Francis Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1799195188952825856
spelling Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniquesVedelago, José AlbertoQuiroga, Andrés Agustin IgnacioValente, Mauro AndresFricke Gel DosimetryFerric Ions DiffusionFinite Elements ModelingRadiotherapyhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Diffusion of ferric ions in ferrous sulfate (Fricke) gels represents one of the main drawbacks of some radiation detectors, such as Fricke gel dosimeters. In practice, this disadvantage can be overcome by prompt dosimeter analysis, and constraining strongly the time between irradiation and analysis, implementing special dedicated protocols aimed at minimizing signal blurring due to diffusion effects. This work presents a novel analytic modeling and numerical calculation approach of diffusion coefficients in Fricke gel radiation sensitive materials. Samples are optically analyzed by means of visible light transmission measurements by capturing images with a charge-coupled device camera provided with a monochromatic filter corresponding to the XO-infused Fricke solution absorbance peak. Dose distributions in Fricke gels are suitably delivered by assessing specific initial conditions further studied by periodical sample image acquisitions. Diffusion coefficient calculations were performed using a set of computational algorithms based on inverse problem formulation. Although 1D approaches to the diffusion equation might provide estimations of the diffusion coefficient, it should be calculated in the 2D framework due to the intrinsic bi-dimensional characteristics of Fricke gel layers here considered as radiation dosimeters. Thus a suitable 2D diffusion model capable of determining diffusion coefficients was developed by fitting the obtained algorithm numerical solutions with the corresponding experimental data. Comparisons were performed by introducing an appropriate functional in order to analyze both experimental and numerical values. Solutions to the second-order diffusion equation are calculated in the framework of a dedicated method that incorporates finite element method. Moreover, optimized solutions can be attained by gradient-type minimization algorithms. Knowledge about diffusion coefficient for a Fricke gel radiation detector is helpful in accounting for effects regarding elapsed time between dosimeter irradiation and further analysis. Hence, corrections might be included in standard dependence of optical density differences and actual, non-diffused, absorbed dose distributions. The obtained values for ferric ion diffusion coefficient are around 0.65 mm2 h−1, being in good agreement with previous works corresponding to similar Fricke gel dosimeter compositions. Therefore, more accurate 2D and 3D dose mapping might be attained, thus constituting valuable improvements in Fricke gel dosimetry, and parallely a high precision method of diffusion modeling and calculation has been developed.Fil: Vedelago, José Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; ArgentinaFil: Quiroga, Andrés Agustin Ignacio. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; ArgentinaFil: Valente, Mauro Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; ArgentinaTaylor & Francis Ltd2014-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/31855Valente, Mauro Andres; Quiroga, Andrés Agustin Ignacio; Vedelago, José Alberto; Characterization of ferric ions diffusion in Fricke gel dosimeters by using inverse problem techniques; Taylor & Francis Ltd; Radiation Effects And Defects In Solids; 169; 10; 10-2014; 845-8541042-0150CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1080/10420150.2014.958749info:eu-repo/semantics/altIdentifier/url/http://www.tandfonline.com/doi/abs/10.1080/10420150.2014.958749info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T13:45:44Zoai:ri.conicet.gov.ar:11336/31855instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982024-05-08 13:45:44.357CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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