Kudrevicius Linas, Jaselskė Evelina, Stankus Gabrielius, Arslonova Shirin, Adliene Diana
Physics Department, Kaunas University of Technology, 51368 Kaunas, Lithuania.
Neurosurgery Department, Lithuanian University of Health Sciences, 44307 Kaunas, Lithuania.
Gels. 2024 Apr 24;10(5):290. doi: 10.3390/gels10050290.
Ionizing radiation covers a broad spectrum of applications. Since radioactive/radiation pollution is directly related to radiation risk, radiation levels should be strictly controlled. Different detection methods can be applied for radiation registration and monitoring. In this paper, radiation-induced variations in the optical properties of silver-enriched PVA-based hydrogel films with and without azo dye (Toluidine blue O, TBO, and Methyl red, MR) additives were investigated, and the feasibility of these free-standing films to serve as radiation detectors/exposure indicators was assessed. AgNO admixed with PVA gel was used as a source for the radiation-induced synthesis of silver nanoparticles (AgNPs) in irradiated gel films. Three types of sensors were prepared: silver-enriched PVA films containing a small amount of glycerol (AgPVAGly); silver-enriched PVA films with toluidine blue adducts (AgPVAGlyTBO); and silver-enriched PVA films with methyl red additives (AgPVAGlyMR). The selection of TBO and MR was based on their sensitivity to irradiation. The irradiation of the samples was performed in TrueBeam2.1 (VARIAN) using 6 MeV photons. Different doses up to 10 Gy were delivered to the films. The sensitivity of the films was assessed by analyzing the characteristic UV-Vis absorbance peaks on the same day as irradiation and 7, 30, 45, 90, and 180 days after irradiation. It was found that the addition of azo dyes led to an enhanced radiation sensitivity of the AgNPs containing films (0.6 Gy for AgPVAGlyTBO and 0.4 Gy for AgPVAGlyMR) irradiated with <2 Gy doses, indicating their applicability as low-dose exposure indicators. The irradiated films were less sensitive to higher doses. Almost no dose fading was detected between the 7th and 45th day after irradiation. Based on the obtained results, competing AgNP formation and color-bleaching effects in the AgPVAGly films with dye additives are discussed.
电离辐射涵盖了广泛的应用领域。由于放射性/辐射污染与辐射风险直接相关，因此辐射水平应受到严格控制。可采用不同的检测方法进行辐射记录和监测。本文研究了添加和未添加偶氮染料（甲苯胺蓝O、TBO和甲基红、MR）的富银聚乙烯醇基水凝胶薄膜在辐射作用下光学性质的变化，并评估了这些独立薄膜用作辐射探测器/暴露指示器的可行性。将硝酸银与聚乙烯醇凝胶混合用作辐照凝胶薄膜中辐射诱导合成银纳米颗粒（AgNP）的源。制备了三种类型的传感器：含有少量甘油的富银聚乙烯醇薄膜（AgPVAGly）；含有甲苯胺蓝加合物的富银聚乙烯醇薄膜（AgPVAGlyTBO）；以及含有甲基红添加剂的富银聚乙烯醇薄膜（AgPVAGlyMR）。选择TBO和MR是基于它们对辐照的敏感性。使用6兆电子伏光子在TrueBeam2.1（瓦里安）中对样品进行辐照。向薄膜施加高达10戈瑞的不同剂量。在辐照当天以及辐照后7、30、45、90和180天，通过分析特征紫外-可见吸收峰来评估薄膜的灵敏度。结果发现，添加偶氮染料可提高含AgNP薄膜在<2戈瑞剂量辐照下的辐射灵敏度（AgPVAGlyTBO为0.6戈瑞，AgPVAGlyMR为0.4戈瑞），表明它们可作为低剂量暴露指示器。辐照后的薄膜对较高剂量不太敏感。在辐照后第7天至第45天之间几乎未检测到剂量衰减。基于所得结果，讨论了含染料添加剂的AgPVAGly薄膜中竞争性AgNP形成和颜色漂白效应。
