Kinetic simulation of dose-rate effects in the irradiation stage of LiF:Mg,Ti (TLD-100): A model based on hole release via V3-Vk transformation – Implications to TL efficiency
| Autor: | I. Eliyahu, S. Biderman, L. Oster, D. Ginsburg, G. Reshes, Y.S. Horowitz |
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| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Electron capture 02 engineering and technology Trapping 021001 nanoscience & nanotechnology Kinetic energy Thermoluminescence Molecular physics 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Thermoluminescent dosimeter Irradiation 0210 nano-technology Luminescence Instrumentation Excitation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 440:139-145 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2018.10.021 |
| Popis: | The possibility of undiscovered dose-rate effects in the thermoluminescence (TL) of LiF:Mg,Ti (TLD-100) remains an open question. Previous experimental investigations are inconclusive and have been recently criticized. Earlier kinetic calculations have predicted the likelihood of dose-rate effects mainly based on competition between excitation and trapping rates. In this study we discuss the possibility of dose rate effects due to the likely dependence on dose-rate of V3 creation (a two hole center) and transformation to VK one hole centers via electron capture. Kinetic simulations demonstrate that such a dependence can lead to significant changes in the concentrations of the luminescent centers (LCs) following irradiation and consequently to expected changes in the TL response associated with these LCs. The simulations also predict changes in the concentration of the hole-only and electron-hole configurations of the spatially correlated trapping center-luminescent center giving rise to peaks 4 and 5a respectively in the glow curve of TLD-100. The results further emphasize the importance of highly controlled experimental studies. |
| Databáze: | OpenAIRE |
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