In this study, a stable reusable radio-chromic gel dosimeter based on a polyvinyl alcohol-sodium iodide complexes (PVA-NaI) and chemical cross-linking agent glutaraldehyde combined with additives of Glucono-δ-lactone and fructose was prepared and improved by the addition of new additive free radical scavenger dimethyl sulfoxide (DMSO). The radio-chromic gels were exposed to high energy photons (X-rays) to various doses up to 30 Gy, with a constant energy of 6 MV, and a dose rate of 200 cGy min⁻¹ using a medical linear accelerator. UV–Vis spectroscopy technique was used to read out the optical changes of unirradiated and irradiated gel samples in terms of absorbance. The gel samples were transparent, and turn to yellow color after irradiation with a peak absorbance response at 355 nm. The color change is directly related to the absorbed dose. The stability of unirradiated as well as irradiated reusabl gels was remarkably improved by the addition of 500 mM DMSO while maintaining a high dose sensitivity. The developed PVA-NaI radio-chromic gel dosimeter possesses a number of desirable features as a dosimeter, including high sensitivity, excellent dose linearity, dose rate and energy independence, and the PVA-NaI radio-chromic gel dosimeter is reusable, where the color can be decolorized by heating.

本研究以聚乙烯醇-碘化钠复合物（PVA-NaI）和化学交联剂戊二醛为基础，结合葡萄糖酸-δ-内酯和果糖添加剂，制备并改进了一种稳定的可重复使用的放射变色凝胶剂量计。添加新添加剂自由基清除剂二甲基亚砜 (DMSO)。放射致变色凝胶暴露于高能光子（X 射线），各种剂量高达 30 Gy，恒定能量为 6 MV，剂量率为 200 cGy min ^-1使用医用直线加速器。紫外-可见光谱技术用于读出未辐照和辐照凝胶样品在吸光度方面的光学变化。凝胶样品是透明的，并且在照射后变成黄色，在 355 nm 处具有峰值吸光度响应。颜色变化与吸收剂量直接相关。通过添加 500 mM DMSO，未辐照和辐照可重复使用凝胶的稳定性显着提高，同时保持高剂量敏感性。开发的 PVA-NaI 放射显色凝胶剂量计具有作为剂量计的许多理想特性，包括高灵敏度、出色的剂量线性、剂量率和能量独立性，并且 PVA-NaI 放射显色凝胶剂量计可重复使用，其中颜色可加热脱色。