一种具有功能化二甲酚橙-聚乙烯醇（XOPVA）的超低扩散 Fricke 凝胶剂量计。

A very low diffusion Fricke gel dosimeter with functionalised xylenol orange-PVA (XOPVA).

机构信息

School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, Australia.

出版信息

Phys Med Biol. 2019 Oct 16;64(20):205017. doi: 10.1088/1361-6560/ab430c.

Abstract

A gel dosimeter has been developed utilising a recently reported system for reducing Fe diffusion in a Fricke gel dosimeter which chelates xylenol orange to the gelling agent poly(vinyl alcohol) (PVA). Formulations were investigated using both gelatin and PVA as the gelling agent, along with the inclusion of glyoxal. The resulting gel had an optical density dose response of 0.0031 Gy, an auto-oxidation rate of 0.000 23 h, and a diffusion rate of 0.132 mm h which is a significant improvement over previously reported gelatin based Fricke gel dosimeters. The gel was also shown to be energy and dose-rate independent and could be reused after irradiation. Thus, this gel dosimeter has the potential to provide a safe and practical solution to three dimensional radiation dosimetry in the medical environment.

摘要

利用最近报道的一种减少 Fricke 凝胶剂量计中 Fe 扩散的系统，开发了一种凝胶剂量计，该系统将二甲酚橙螯合到凝胶剂聚乙烯醇（PVA）中。使用明胶和 PVA 作为凝胶剂，并加入乙二醛进行了配方研究。所得凝胶的光密度剂量响应为 0.0031 Gy，自氧化速率为 0.00023 h，扩散速率为 0.132 mm h，这明显优于以前报道的基于明胶的 Fricke 凝胶剂量计。该凝胶还表现出能量和剂量率无关性，并且可以在辐照后重复使用。因此，这种凝胶剂量计有可能为医疗环境中的三维辐射剂量测定提供安全实用的解决方案。