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dc.contributor.author
Valente, Mauro Andres  
dc.contributor.author
Molina, Wladimir  
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Carrizales Silva, Lila  
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Figueroa, Rodolfo  
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Malano, Francisco Mauricio  
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Pérez, Pedro Antonio  
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Santibañez, M.  
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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  
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FRICKE  
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XRAY  
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RADIOLOGY  
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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  
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Fil: Carrizales Silva, Lila. Instituto Venezolano de Investigaciones Científicas; Venezuela  
dc.description.fil
Fil: Figueroa, Rodolfo. Universidad de La Frontera; Chile  
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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