Localised and Delocalised Optically Induced Conversion of Composite Glow Peak 5 in LiF:Mg,Ti (TLD-100) to Glow Peak 4 as a Function of Post-irradiation Annealing Temperature
| Autor: | S. Biderman, L. Oster, Y. Einav, Y.S. Horowitz |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Titanium
Optics and Photonics Radiochemistry Radiation Valence (chemistry) Materials science Radiological and Ultrasound Technology Annealing (metallurgy) Energy conversion efficiency Temperature Public Health Environmental and Occupational Health General Medicine Electron Thermal conduction Fluorides Ionization Lithium Compounds Magnesium Thermoluminescent Dosimetry Radiology Nuclear Medicine and imaging Charge carrier Irradiation Atomic physics |
| Zdroj: | Radiation Protection Dosimetry. 100:135-138 |
| ISSN: | 1742-3406 0144-8420 |
| DOI: | 10.1093/oxfordjournals.rpd.a005831 |
| Popis: | The composite structure of glow peak 5 in LiF:Mg,Ti (TLD-100) has been investigated using optical bleaching by 310 nm (4 eV) light. The glow peak conversion efficiency of peak 5a (Tm = 187 degrees C) to peak 4 traps is very high at a value of 3+/-0.5 (1 SD) whereas the glow peak conversion efficiency of peak 5 (Tm = 205 degrees C) to peak 4 traps is 0.0026+/-0.0012 (1 SD). The high conversion efficiency of peak 5a to peak 4 arises from direct optical ionisation of the electron in the electron-hole pair. leaving behind a singly-trapped hole (peak 4), a direct mechanism, relatively free of competitive mechanisms. Optical ionisation of the 'singly-trapped' electron (peak 5), however, can lead to peak 4 only via multi-stage mechanisms involving charge carrier transport in the valence and conduction bands, a mechanism subject to competitive processes. The conduction/valence band competitive processes lead to the factor of one thousand decrease in the conversion efficiency of peak 5 compared to peak 5a. |
| Databáze: | OpenAIRE |
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