The role of hydrogels in the radical production of the Fricke-gel-dosimeter

Lazzaroni, Simone; Liosi, Giulia Maria; D'Agostino, G.; Marconi, Roberto; Mariani, Mario; Buttafava, A.; Dondi, Daniele

doi:10.1016/j.radphyschem.2017.05.009

Cited by 1 publication

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“…A non-exhaustive overview of several compositions of xylenol orange-FG dosimeters investigated by different research groups is given in Table 1. [35] PVA + GTA 10.0-12.5 0.5 0.165 Lazzaroni et al [36] PVA + GTA 10.0 0.5 0.165 Gelatin 3.0 0.5 0.165 Considering the gel matrices used to prepare FG dosimeters, the interest in hydrogels obtained with poly(vinyl alcohol) (PVA) and cross-linked by glutaraldehyde (GTA) is increasing [19,20,25,26,35,[58][59][60][61]. Indeed, compared with natural gelling agents such as gelatin and agarose, such synthetic compounds allow for higher levels of reproducibility in the manufacturing process of FG dosimeters and slower diffusion of Fe 3+ ions within the gel matrix [38,39,58].…”

Section: Introductionmentioning

confidence: 99%

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

Scotti

Arosio

Brambilla

et al. 2022

Gels

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The development of Fricke gel (FG) dosimeters based on poly(vinyl alcohol) (PVA) as the gelling 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 concentrations 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 spectrophotometric analyses can be obtained using 1.00–0.40 mM and 0.200–0.166 mM concentrations of FAS and XO, respectively.

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