Magnesium aluminate spinel for optically stimulated luminescence dosimetry
| Autor: | Luiz G. Jacobsohn, Stephen W.S. McKeever, L. Pan, Sergey Sholom |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Optically stimulated luminescence Analytical chemistry chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences symbols.namesake Materials Chemistry Dosimeter Magnesium Mechanical Engineering Spinel Metals and Alloys Radioluminescence 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials Optically Stimulated Luminescence Dosimetry symbols engineering 0210 nano-technology Luminescence Raman spectroscopy |
| Zdroj: | Journal of Alloys and Compounds. 880:160503 |
| ISSN: | 0925-8388 |
| Popis: | Motivated by the search of new materials for optically stimulated luminescence (OSL) dosimeters, magnesium aluminum spinels with different Mg:Al ratios were investigated. Powders were prepared via the co-precipitation method with Mg:Al ratios 1:2 (stoichiometric), 1.5:2 (MgO-rich) and 1:3 (Al2O3-rich) and calcined at 1000 °C in air for 2 h. A higher level of structural disorder was found in the powders than in the single crystal as determined by X-ray diffraction and Raman spectroscopy measurements, while the same luminescence centers were present in all materials as shown by X-ray induced radioluminescence measurements. Among the different Mg:Al ratios, stoichiometric spinel presented superior OSL dose response, being linear within 0.16 Gy and 2 Gy, presenting 1% reproducibility of the dosimetric response after repeated exposure to the same dose, having the least fading, and with a minimum detectable absorbed dose (MDD) of 0.65 mGy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect