Ciesielski Bartlomiej, Schultka Katarzyna, Wolakiewicz Grzegorz
Department of Physics and Biophysics, Medical University of Gdansk, Debinki 1, 80-211 Gdansk, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2006 Mar 13;63(4):870-4. doi: 10.1016/j.saa.2005.10.018. Epub 2006 Feb 21.
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.
本研究是我们参与第三次电子顺磁共振牙齿剂量测定国际比对期间所开展工作的延续。在样品制备过程中，所有22个牙釉质样品意外地在150摄氏度的温度下暴露了约30分钟。这极大地影响了它们的电子顺磁共振谱的形状，主要原因是背景信号大幅增加，其对谱的贡献大约增加了一倍。使用其他牙釉质样品，在剂量和加热温度可控的条件下对这些影响进行了更深入的研究。加热后几天内，观察到的谱形状变化部分消退。加热还导致明显产生了一种类似于辐射在牙釉质中诱导的剂量测定信号的谱成分。加热样品的电子顺磁共振谱中温度诱导的剂量测定成分在32天内保持恒定。根据谱数值处理中应用的背景谱类型，计算得出的剂量测定信号对辐照样品总电子顺磁共振谱的贡献偏差在其在未加热牙釉质中初始贡献的-12%至+15%之间。
