The effect of mixed dopants on the stability of Fricke gel dosimeters

7th International Conference on 3D Radiation Dosimetry

Penev, K.^1 ; Mequanint, K.^1

Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON N6A 5B9, Canada^1

关键词: 1 ,10-phenanthroline;    Autooxidation;    Bi-functional;    Cross linking agents;    Diffusion rate;    Fast diffusion;    Phenanthrolines;    Xylenol Orange;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012105/pdf
DOI  :  10.1088/1742-6596/444/1/012105

来源: IOP

【 摘 要 】

Auto-oxidation and fast diffusion in Fricke gels are major drawbacks to wide-spread application of these gels in 3D dosimetry. Aiming to limit both processes, we used mixed dopants: the ferric-specific ligand xylenol orange with a ferrous-specific ligand (1,10-phenanthroline) and/or a bi-functional cross-linking agent (glyoxal). Markedly improved auto-oxidation stability was observed in the xylenol orange and phenanthroline doped gel at the expense of increased background absorbance and faster diffusion. Addition of glyoxal limited the diffusion rate and led to a partial bleaching of the gel. It is conceivable that these two new compositions may find useful practical application.