The use of synthetic gel matrices prepared with poly(vinyl-alcohol) (PVA) cross-linked by glutaraldehyde (GTA) contributed to enhance the interest toward radiochromic Fricke gel (FG) dosimeters. As it occurs in several chemical dosimeters, the response of PVA-GTA Fricke gels could be affected by temperature. Aim of this work is to study the dependence of the dosimetric properties of PVA-GTA Fricke gel dosimeters both on the irradiation temperature and on temperature changes possibly occurring between the irradiation and readout phases. Such effects were investigated by means of magnetic resonance imaging (MRI) and optical absorbance (OA) measurements. The results did not reveal any significant dependence of the sensitivity of the dosimeters on the irradiation temperature in the investigated interval 20°C-35°C. By contrast, auto-oxidation phenomena confirmed to be a critical aspect for FG dosimeters, also in case of use of PVA matrix. The extent such phenomena, that might impair the accuracy of dose estimations, proved to critically depend on the temperature at which FG dosimeters are subjected before and after irradiation, as well as on the duration of possible thermal-stress.

Temperature behavior of radiochromic poly(vinyl-alcohol)–glutaraldehyde Fricke gel dosimeters in practice / S. Gallo, D. Lizio, A. Filippo Monti, I. Veronese, M. Grazia Brambilla, C. Lenardi, A. Torresin, G.L.C. Gambarini. - In: JOURNAL OF PHYSICS. D, APPLIED PHYSICS. - ISSN 1361-6463. - 53:26(2020), pp. 365003.1-365003.10.

Temperature behavior of radiochromic poly(vinyl-alcohol)–glutaraldehyde Fricke gel dosimeters in practice

S. Gallo
Primo
Investigation
;
I. Veronese
Writing – Original Draft Preparation
;
C. Lenardi
Supervision
;
A. Torresin
Visualization
;
G.L.C. Gambarini
Ultimo
Validation
2020

Abstract

The use of synthetic gel matrices prepared with poly(vinyl-alcohol) (PVA) cross-linked by glutaraldehyde (GTA) contributed to enhance the interest toward radiochromic Fricke gel (FG) dosimeters. As it occurs in several chemical dosimeters, the response of PVA-GTA Fricke gels could be affected by temperature. Aim of this work is to study the dependence of the dosimetric properties of PVA-GTA Fricke gel dosimeters both on the irradiation temperature and on temperature changes possibly occurring between the irradiation and readout phases. Such effects were investigated by means of magnetic resonance imaging (MRI) and optical absorbance (OA) measurements. The results did not reveal any significant dependence of the sensitivity of the dosimeters on the irradiation temperature in the investigated interval 20°C-35°C. By contrast, auto-oxidation phenomena confirmed to be a critical aspect for FG dosimeters, also in case of use of PVA matrix. The extent such phenomena, that might impair the accuracy of dose estimations, proved to critically depend on the temperature at which FG dosimeters are subjected before and after irradiation, as well as on the duration of possible thermal-stress.
Radiochromic Fricke gel; Poly(vinyl-alcohol); Glutaraldehyde; Irradiation temperature; Thermal effect; MRI-dosimetry
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
Settore FIS/01 - Fisica Sperimentale
Settore MED/36 - Diagnostica per Immagini e Radioterapia
Settore CHIM/02 - Chimica Fisica
Article (author)
File in questo prodotto:
File Dimensione Formato  
Gallo_JPD_2020_Preprint.pdf

accesso aperto

Descrizione: Articolo in preprint
Tipologia: Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione 901.91 kB
Formato Adobe PDF
901.91 kB Adobe PDF Visualizza/Apri
JPD_2020_Gallo_Temperatura.pdf

accesso riservato

Descrizione: Articolo esteso
Tipologia: Publisher's version/PDF
Dimensione 2.23 MB
Formato Adobe PDF
2.23 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/750682
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 9
social impact