The use of synthetic gel matrices prepared with poly(vinyl-alcohol) (PVA) cross-linked by glutaraldehyde (GTA) contributed to enhance the interest toward radiochromic Fricke gel (FG) dosimeters. As it occurs in several chemical dosimeters, the response of PVA-GTA Fricke gels could be affected by temperature. Aim of this work is to study the dependence of the dosimetric properties of PVA-GTA Fricke gel dosimeters both on the irradiation temperature and on temperature changes possibly occurring between the irradiation and readout phases. Such effects were investigated by means of magnetic resonance imaging and optical absorbance measurements. The results did not reveal any significant dependence of the sensitivity of the dosimeters on the irradiation temperature in the investigated interval 20–35 °C. By contrast, auto-oxidation phenomena confirmed to be a critical aspect for FG dosimeters, also in case of use of PVA matrix. The extent such phenomena, that might impair the a...

中文翻译：

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放射性变色聚乙烯醇-戊二醛Fricke凝胶剂量计的实际温度行为

使用由戊二醛（GTA）交联的聚乙烯醇（PVA）制备的合成凝胶基质有助于增强对放射致变Fricke凝胶（FG）剂量计的兴趣。由于它发生在几种化学剂量计中，因此PVA-GTA Fricke凝胶的响应可能会受到温度的影响。这项工作的目的是研究PVA-GTA Fricke凝胶剂量计的剂量特性对辐照温度以及辐照和读出阶段之间可能发生的温度变化的依赖性。通过磁共振成像和光吸收率测量研究了这种效应。结果并未显示在研究的20-35°C间隔内剂量计的灵敏度对辐照温度有任何显着依赖性。相比之下，在使用PVA基质的情况下，自氧化现象被证实是FG剂量计的关键方面。这种现象在多大程度上可能会损害人体的健康。