The development of Fricke gel (FG) dosimeters based on poly(vinyl alcohol) (PVA) as the gel-ling agent and glutaraldehyde (GTA) as the cross-linker has enabled significant improvements in the dose response and the stability over time of spatial radiation dose distributions. However, a standard procedure for preparing FG in terms of reagent concentrations is still missing in the literature. This study aims to investigate, by means of spectrophotometric analyses, how the sensitivity to the radiation dose and the range of linearity of the dose–response curve of PVA-GTA-FG dosimeters loaded with xylenol orange sodium salt (XO) are influenced by ferrous ammonium sulphate (FAS) and XO concentrations. Moreover, the effect of different concentra-tions of such compounds on self-oxidation phenomena in the dosimeters was evaluated. PVA-GTA-FG dosimeters were prepared using XO concentrations in the range 0.04–0.80 mM and FAS in the range 0.05–5.00 mM. The optical absorbance properties and the dose response of FG were investigated in the interval 0.0-42.0 Gy. The results demonstrate that the amount of FAS and XO determines both the sensitivity to the absorbed dose and the interval of linearity of the dose–response curve. The study suggests that the best performances of FG dosimeters for spec-trophotometric analyses can be obtained using 1.00–0.40 mM and 0.200–0.166 mM concentrations of FAS and XO, respectively.

How Xylenol Orange and Ferrous Ammonium Sulphate Influence the Dosimetric Properties of PVA–GTA Fricke gel Dosimeters: a Spectrophotometric Study / M. Scotti, P. Arosio, E. Brambilla, S. Gallo, C. Lenardi, S. Locarno, F. Orsini, E. Pignoli, L. Pedicone, I. Veronese. - In: GELS. - ISSN 2310-2861. - 8:4(2022 Apr), pp. 204.1-204.17. [10.3390/gels8040204]

How Xylenol Orange and Ferrous Ammonium Sulphate Influence the Dosimetric Properties of PVA–GTA Fricke gel Dosimeters: a Spectrophotometric Study

P. Arosio
Secondo
;
E. Brambilla;S. Gallo
;
C. Lenardi;S. Locarno;F. Orsini;E. Pignoli;I. Veronese
Ultimo
2022-04

Abstract

The development of Fricke gel (FG) dosimeters based on poly(vinyl alcohol) (PVA) as the gel-ling agent and glutaraldehyde (GTA) as the cross-linker has enabled significant improvements in the dose response and the stability over time of spatial radiation dose distributions. However, a standard procedure for preparing FG in terms of reagent concentrations is still missing in the literature. This study aims to investigate, by means of spectrophotometric analyses, how the sensitivity to the radiation dose and the range of linearity of the dose–response curve of PVA-GTA-FG dosimeters loaded with xylenol orange sodium salt (XO) are influenced by ferrous ammonium sulphate (FAS) and XO concentrations. Moreover, the effect of different concentra-tions of such compounds on self-oxidation phenomena in the dosimeters was evaluated. PVA-GTA-FG dosimeters were prepared using XO concentrations in the range 0.04–0.80 mM and FAS in the range 0.05–5.00 mM. The optical absorbance properties and the dose response of FG were investigated in the interval 0.0-42.0 Gy. The results demonstrate that the amount of FAS and XO determines both the sensitivity to the absorbed dose and the interval of linearity of the dose–response curve. The study suggests that the best performances of FG dosimeters for spec-trophotometric analyses can be obtained using 1.00–0.40 mM and 0.200–0.166 mM concentrations of FAS and XO, respectively.
Fricke gel dosimetry; xylenol orange sodium salt; ferrous ammonium sulphate; PVA-GTA hy-drogel
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
Settore MED/36 - Diagnostica per Immagini e Radioterapia
Settore CHIM/06 - Chimica Organica
Settore CHIM/02 - Chimica Fisica
PSR2015-1715LPERI_M - PIANO DI SOSTEGNO ALLA RICERCA 2015-2017 - LINEA 2 "DOTAZIONE ANNUALE PER ATTIVITA' ISTITUZIONALE" - PERINI, LAURA - PSR2015-17 - Piano di sviluppo di ricerca 2015-17 - 2015
23-mar-2022
https://www.mdpi.com/2310-2861/8/4/204
Article (author)
File in questo prodotto:
File Dimensione Formato  
Gels_Scotti_2022.pdf

accesso aperto

Descrizione: Articolo esteso in OPEN ACCESS
Tipologia: Publisher's version/PDF
Dimensione 994.39 kB
Formato Adobe PDF
994.39 kB Adobe PDF Visualizza/Apri
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/2434/918288
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 1
social impact