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dc.contributor.author
Valente, Mauro Andres
dc.contributor.author
Molina, Wladimir
dc.contributor.author
Carrizales Silva, Lila
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Figueroa, Rodolfo
dc.contributor.author
Malano, Francisco Mauricio
dc.contributor.author
Pérez, Pedro Antonio
dc.contributor.author
Santibañez, M.
dc.contributor.author
Vedelago, José Alberto
dc.date.available
2023-01-31T13:13:33Z
dc.date.issued
2016-07
dc.identifier.citation
Valente, Mauro Andres; Molina, Wladimir; Carrizales Silva, Lila; Figueroa, Rodolfo; Malano, Francisco Mauricio; et al.; Fricke gel dosimeter with improved sensitivity for low-dose-level measurements; American Association of Physicists in Medicine; Journal Of Applied Clinical Medical Physics; 17; 4; 7-2016; 402-417
dc.identifier.issn
1526-9914
dc.identifier.uri
http://hdl.handle.net/11336/186266
dc.description.abstract
Fricke solution has a wide range of applications as radiation detector and dosimetry. It is particularly appreciated in terms of relevant comparative advantages, like tissue- equivalence when prepared in aqueous media like gel matrix, continuous mapping capability, independence of dose rate and incident direction, as well as linear dose response. This work presents the development and characterization of an improved Fricke gel system, based on modified chemical compositions, making possible its application in clinical radiology due to its improved sensitivity. Properties of standard Fricke gel dosimeter for high-dose levels are used as a starting point, and suitable chemical modifications are introduced and carefully investigated in order to attain high resolution for low-dose ranges, like those corresponding to radiol- ogy interventions. The developed Fricke gel radiation dosimeter system achieves the expected typical dose-dependency, showing linear response in the dose range from 20 up to 4000 mGy. Systematic investigations including several chemical compositions are carried out in order to obtain an adequate dosimeter response for low-dose levels. A suitable composition from among those studied is selected as a good candidate for low-dose-level radiation dosimetry consisting of a modified Fricke solution fixed to a gel matrix containing benzoic acid along with sulfuric acid, ferrous sulfate, Xylenol orange, and tridistilled water. Dosimeter samples are prepared in standard vials for in-phantom irradiation and further characterization by spectrophotometry measuring visible light transmission and absorbance before and after irradiation. Samples are irradiated using typical X-ray tubes for radiology and calibrated Farmer-type ionization chamber is used as reference to measure dose rates inside phantoms at vial locations. Once sensitive material composition is optimized, dose-response curves show significant improvement regarding over- all sensitivity for low dose levels. The aim of this work consists of implementing the optimized gel dosimeter to perform direct measurements of absorbed dose in samples irradiated during microcomputed tomography scanning in order to preliminary assess dose levels for further scanning of small animals for further applications in veterinary and paleontology. As a first attempt, dose distributions were measured in water-equivalent phantoms having dimensions comparable to small animals, 100 to 1000 cm3, approximately. According to the obtained results, it is found that the proposed method shows satisfactory reliability and adequate performance for a promising gel dosimetry system.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Association of Physicists in Medicine
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
DOSIMETRY
dc.subject
FRICKE
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XRAY
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RADIOLOGY
dc.subject.classification
Física Atómica, Molecular y Química
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Fricke gel dosimeter with improved sensitivity for low-dose-level measurements
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-01-27T16:06:23Z
dc.journal.volume
17
dc.journal.number
4
dc.journal.pagination
402-417
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: 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 de La Frontera; Chile
dc.description.fil
Fil: Molina, Wladimir. Instituto Venezolano de Investigaciones Científicas; Venezuela
dc.description.fil
Fil: Carrizales Silva, Lila. Instituto Venezolano de Investigaciones Científicas; Venezuela
dc.description.fil
Fil: Figueroa, Rodolfo. Universidad de La Frontera; Chile
dc.description.fil
Fil: Malano, Francisco Mauricio. 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 Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Física; Argentina
dc.description.fil
Fil: Pérez, Pedro Antonio. 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 Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Física; Argentina
dc.description.fil
Fil: Santibañez, M.. Universidad de La Frontera; Chile
dc.description.fil
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 Rio Cuarto. Facultad de Cs.exactas Fisicoquímicas y Naturales. Departamento de Física; Argentina
dc.journal.title
Journal Of Applied Clinical Medical Physics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://aapm.onlinelibrary.wiley.com/doi/full/10.1120/jacmp.v17i4.5626
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1120/jacmp.v17i4.5626
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