Combustion synthesis: A suitable method to prepare Al2O3 doped materials for thermoluminescent dosimetry
- 作者：Viní ; cius S.M. de Barros ; Walter M. de Azevedo ; Helen J. Khoury ; Pedro Linhares Filho
- 关键词：Combustion synthesis ; Aluminum oxide ; Rare-earth doping
- 刊名：Radiation Measurements
- 出版年：2008
- 期刊代码：71_13504487
- 类别：ce
- 出版时间：February-June 2008
- 卷：43
- 期：2-6
- 页码：345-348
- 文件大小：161 K
摘要
In this work we present an alternative route to synthesize rare-earth doped aluminum oxide materials for thermoluminescent (TL) dosimetry using the combustion synthesis (CS) technique. The samples were prepared by mixing aluminum nitrate (Al(NO3)3·9H2O), urea (CO(NH2)2), and europium nitrate (Eu(NO3)3), terbium nitrate (Tb(NO3)3) and tetra-ethyl-ortho-silicate (TEOS, C8H20O4Si) in appropriate amounts as dopants in an aqueous solution. The excess water was evaporated on a hot plate to form a gelatinous mixture, which was then transferred to a muffle furnace pre-heated to 1a529dd34">
where it ignited spontaneously within a few seconds. The TL glow curve of the irradiated samples showed an isolated peak at around 
for the Eu doped sample which is suitable for radiation dosimetry. The europium concentration was varied from 0.005%to 7%in order to study the effect of the dopant concentration on the TL response and the optimum concentration was found to be 0.5%. The effect of different annealing temperatures of the sample on the TL response was also studied and the results showed a broad TL peak for 600 and a55ec359ea1">
and a well defined peak for a 
annealing temperature. From these results it is possible to conclude that the CS method is a very suitable technique to prepare doped aluminum oxide materials. The technique is fast, low cost and produces well defined materials that can be used for dosimetric applications. Further work is still under way in order to optimize sensitivity for low dose measurements.