Departamento de Física e Matemática, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto-SP, Brazil.
Health Phys. 2010 Feb;98(2):406-11. doi: 10.1097/01.HP.0000348017.54094.73.
In case of a radiological accident, it is important to determine the exposure to radiation of the general population. Several materials can be used to reconstruct the exposed dose. Tooth enamel has been studied for a long time, and now the procedures to determine the dose are well established for in vitro measurements. Many materials have been investigated by different techniques: sugar, wall bricks, roof tiles, plastics, watch glass, ruby present in watches, medicines carried by persons and shell button, among others. In this work an attempt is made to use sweeteners as a possible accident dosimeter material because they are becoming increasingly common. Sweeteners based on saccharine, cyclamate, stevia, and aspartame were acquired in local stores, and ESR spectrum was recorded before and after gamma irradiation. Spectrum simulation demonstrated that there are two main radicals with g = 2.0063, A = 1.6 mT, and g = 2.0048, A = 5 mT due to lactose. For the better characterization of spectroscopic and dosimetric properties of these materials, higher microwave frequency (K-band, nu approximately 24 GHz) was also employed. Experiments in X-band (nu approximately 9 GHz) showed that low dose levels of 500 mGy can be measured with this material, demonstrating the potential use of sweeteners for retrospective dosimetry.
如果发生放射性事故，确定一般人群的辐射暴露量很重要。有几种材料可用于重建暴露剂量。牙釉质已经研究了很长时间，现在已经建立了用于体外测量的确定剂量的程序。许多材料已经通过不同的技术进行了研究：糖、墙砖、瓦、塑料、手表玻璃、手表中的红宝石、携带的药物和贝壳纽扣等。在这项工作中，尝试使用甜味剂作为可能的事故剂量计材料，因为它们越来越普遍。在当地商店购买了基于糖精、环己胺、甜菊糖和阿斯巴甜的甜味剂，并在伽马辐照前后记录了 ESR 光谱。光谱模拟表明，由于乳糖，存在两个主要的自由基，g = 2.0063，A = 1.6 mT，g = 2.0048，A = 5 mT。为了更好地表征这些材料的光谱和剂量学特性，还采用了更高的微波频率（K 波段，nu 约为 24 GHz）。X 波段（nu 约为 9 GHz）的实验表明，这种材料可以测量低至 500 mGy 的低剂量水平，表明甜味剂在回溯剂量学中的潜在用途。
