Geber-Bergstrand Therése, Bernhardsson Christian, Mattsson Sören, Rääf Christopher L
Medical Radiation Physics, Department of Clinical Sciences, Malmö, Lund University, Skåne University Hospital Malmö, 205 02, Malmö, Sweden,
Radiat Environ Biophys. 2012 Nov;51(4):443-9. doi: 10.1007/s00411-012-0434-9. Epub 2012 Sep 13.
Following a radiological or nuclear emergency event, there is a need for quick and reliable dose estimations of potentially exposed people. In situations where dosimeters are not readily available, the dose estimations must be carried out using alternative methods. In the present study, the optically stimulated luminescence (OSL) properties of tooth enamel and different dental repair materials have been examined. Specimens of the materials were exposed to gamma and beta radiation in different types of liquid environments to mimic the actual irradiation situation in the mouth. Measurements were taken using a Risø TL/OSL reader, and irradiations were made using a (90)Sr/(90)Y source and a linear accelerator (6 MV photons). Results show that the OSL signal from tooth enamel decreases substantially when the enamel is kept in a wet environment. Thus, tooth enamel is not reliable for retrospective dose assessment without further studies of the phenomenon. Dental repair materials, on the other hand, do not exhibit the same effect when exposed to liquids. In addition, dose-response and fading measurements of the dental repair materials show promising results, making these materials highly interesting for retrospective dosimetry. The minimum detectable dose for the dental repair materials has been estimated to be 20-185 mGy.
在发生放射或核应急事件后，需要对可能受照人员进行快速可靠的剂量估算。在剂量计不易获取的情况下，必须使用替代方法进行剂量估算。在本研究中，已对牙釉质和不同牙科修复材料的光激发发光（OSL）特性进行了研究。将这些材料的样本置于不同类型的液体环境中，使其受到伽马和贝塔辐射，以模拟口腔中的实际辐照情况。使用Risø TL/OSL读数器进行测量，并使用（90）Sr/（90）Y源和直线加速器（6兆伏光子）进行辐照。结果表明，当牙釉质置于潮湿环境中时，其OSL信号会大幅下降。因此，在未对该现象进行进一步研究的情况下，牙釉质对于回顾性剂量评估并不可靠。另一方面，牙科修复材料在接触液体时不会表现出相同的效果。此外，牙科修复材料的剂量响应和衰退测量显示出有前景的结果，这使得这些材料对于回顾性剂量测定非常有吸引力。牙科修复材料的最小可探测剂量估计为20 - 185毫戈瑞。
