Characterisation of TruView?: a new 3-D reusable radiochromic MethylThymolBlue based gel dosimeter for ionising radiations

9th International Conference on 3D Radiation Dosimetry

Colnot, J.^1 ; Huet, C.^1 ; Clairand, I.^1

Institut de Radioprotection et de Sureté Nuclé Aire (IRSN), Service de Dosimé Trie Externe, Laboratoire de Dosimé Trie des Rayonnements Ionisants, Fontenay-aux-Roses, France^1

关键词: Autooxidation;    Dose response;    Happens-before;    Ions diffusion;    Linear response;    Reactive dyes;    Spectrophotometric measurements;    Water equivalent;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/847/1/012017/pdf
DOI  :  10.1088/1742-6596/847/1/012017

来源: IOP

【 摘 要 】

TruView™ is a new water-equivalent reusable Fricke gel dosimeter based on MethylThymolBlue reactive dye. Details of the characterisation of the TruView™ MTB gel dosimeter by spectrophotometric measurements and of its reading with the Optical-CT Scanner Vista™ are described. In this study, the different parameters influencing TruView™ dose response have been studied and its performances have been compared to chamber and diodes measurements. This gel presents a linear response with dose up to 20 Gy, independent in the investigated range of photon beam energy and dose rate and also a good intra-batch uniformity. Ions diffusion into the matrix homogenizes the gel after a week, losing dosimetric information but allowing a new irradiation to be performed. However, auto-oxidation happens before and after irradiation, degrading the dosimeter response and stability. Storage and reading conditions affect the response as well.