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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >The effect of heating on background and radiation-induced EPR signals in tooth enamel
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The effect of heating on background and radiation-induced EPR signals in tooth enamel

机译：加热对牙釉质中本底和辐射诱发的EPR信号的影响

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摘要

The presented study is a continuation Of Our work performed during participation in the Third International Intercomparison on EPR Tooth Dosimetry. During the process of samples preparation, all 22 enamel samples were accidentally exposed for about 30 min to 150 degrees C temperature. This considerably affected shape of their EPR spectra mainly due to substantial increase in the background signal, which approximately doubled its contribution to the spectra. These effects were studied closer under controlled conditions of the delivered dose and heating temperature using another enamel samples. The observed changes in the spectra shape partially faded within a few days after heating. The heating resulted also in a noticeable generation of a spectral component similar to the dosimetric signal induced in enamel by radiation. The temperature-induced dosimetric component in EPR spectra of the heated samples remained constant for 32 days. Deviations in calculated contributions of the dosimetric signal into total EPR spectra of irradiated sample varied from -12 to +15% of its initial contribution in the non-heated enamel, depending on type of the background spectrum applied in numerical processing of the spectra. (c) 2005 Elsevier B.V. All rights reserved.
机译：提出的研究是我们参加第三次EPR牙齿剂量学国际比对期间所做工作的延续。在样品制备过程中，所有22个搪瓷样品都意外暴露了约30分钟至150摄氏度的温度。 EPR光谱的形状受到很大影响，这主要是由于背景信号的显着增加，其对光谱的贡献几乎翻了一番。使用另一种搪瓷样品，在输送剂量和加热温度的受控条件下，对这些效果进行了更深入的研究。加热后几天内观察到的光谱形状变化部分消失。加热还导致产生明显的光谱成分，类似于通过辐射在牙釉质中感应出的剂量信号。在加热的样品的EPR光谱中，温度诱导的剂量学成分在32天内保持恒定。在非加热搪瓷中，剂量信号对辐射样品总EPR光谱的计算贡献偏差在其初始贡献的-12％到+ 15％之间变化，具体取决于在光谱的数值处理中应用的背景光谱的类型。 （c）2005 Elsevier B.V.保留所有权利。

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