G(Fe³⁺) values in the FBX dosemeter

Fricke xylenol gel characterization using a photoacustic technique

“…The optical absorbance of the sample held at the lower temperature increases linearly with time by 4.1 Â 10 À3 h À1 for the non-irradiated sample and by 1.9 Â 10 À3 h À1 for the irradiated one. For the samples maintained at higher temperature, the natural oxidation rate is faster owing to a higher reaction rate and to a larger ionic mobility, because the ionizing radiation reduces the oxygen concentration in FXG [23][24][25] and because additional oxidation depends on the oxygen concentration, one should expect a slower oxidation for irradiated samples. Finally, we demonstrated the PAS technique by measuring the 60 Co g-beam homogeneity.…”

A rhodamine coumarin-derived fluorescence probe that selectively detects Fe3+ and measures radiation doses

“…To reduce the lower LOD, Gupta et al constructed a novel Fricke dosimeter by adding certain amounts of xylenol orange and benzoic acid to the standard Fricke solution. 24 When xylenol orange was used as an indicator and benzoic acid was used as a free radical yield amplifier, the lower LOD was reduced for radiation doses to less than 1 Gy. However, the method showed a nonlinear response in a dose range of 0–10 Gy.…”

Technical Note: Preliminary investigations into the use of a functionalised polymer to reduce diffusion in Fricke gel dosimeters

“…When xylenol orange is added to Fricke gels, the oxidation of Fe 2+ to Fe 3+ induces an inherent increase in the electropositivity of the ion, allowing the coordination of the Fe 3+ ion by the xylenol orange molecule. 2,5,[9][10][11] Upon this coordination, the Fe 3+ ion bound to xylenol orange is unable to move throughout the gel matrix on its own. As such, any subsequent diffusion of dose information contained by the coordinated ferric ion is via movement of the much larger ferric xylenol orange molecule.…”