Fricke-gel dosimeter: overview of Xylenol Orange chemical behavior

The complexation between Xylenol Orange (XO) and Fe3+ ions plays a key role in Fricke-gel dosimeters for the determination of the absorbed dose via UV–vis analysis. In this study, the effect of XO and the acidity of the solution on the complexation mechanism was investigated. Moreover, starting from...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2017-11, Vol.140, p.74-77
Main Authors: Liosi, G.M., Dondi, D., Vander Griend, D.A., Lazzaroni, S., D’Agostino, G., Mariani, M.
Format: Article
Language:English
Subjects:
Absorption spectra
Calibration
Chemical reactions
Complexation
Dosimeters
Dosimetry
Factor analysis
Fricke dosimeter
Knowledge acquisition
Optical spectrometry
Radiation
Radiation dosimetry
Scientific imaging
Titration
Xylenol Orange
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Summary:The complexation between Xylenol Orange (XO) and Fe3+ ions plays a key role in Fricke-gel dosimeters for the determination of the absorbed dose via UV–vis analysis. In this study, the effect of XO and the acidity of the solution on the complexation mechanism was investigated. Moreover, starting from the results of complexation titration and Equilibrium Restricted Factor Analysis, four XO-Fe3+ complexes were identified to contribute to the absorption spectra. Based on the acquired knowledge, a new [Fe3+] vs dose calibration method is proposed. The preliminary results show a significant improvement of the sensitivity and dose threshold with respect to the commonly used Abs vs dose calibration method. •Xylenol Orange (XO) impurities were qualitative assessed with HPLC and MS.•Speciation mechanism between XO and Fe3+ was studied via optical analysis.•The system absorption spectra was properly studied and deconvoluted.•[Fe3+] vs dose calibration procedure was developed for Fricke aqueous solution.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2017.01.012