The composite structure of peak 5 in the glow curve of LiF:Mg,Ti (TLD-100): confirmation of peak 5a arising from a locally trapped electron-hole configuration
| Autor: | Y S, Horowitz, L, Oster, D, Satinger, S, Biderman, Y, Einav |
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| Rok vydání: | 2002 |
| Předmět: |
Titanium
Optics and Photonics Radiation Materials science Radiochemistry Radiological and Ultrasound Technology Energy conversion efficiency Public Health Environmental and Occupational Health Electrons General Medicine Electron hole Models Theoretical Fluence Helium Ion Fluorides Lithium Compounds Radiology Nuclear Medicine and imaging Magnesium Thermoluminescent Dosimetry Thermoluminescent dosimeter Irradiation Atomic physics Saturation (chemistry) Order of magnitude |
| Zdroj: | Radiation protection dosimetry. 100(1-4) |
| ISSN: | 0144-8420 |
| Popis: | The hypothesis that glow peak 5a arises from localised e-h capture is confirmed by the following experimental observations: (i) The high conversion efficiency (CE) (CE 5a→4 = 3 ± 0.5) of peak 5a to peak 4 (a hole-only trap) deduced from detailed I m -T stop optical bleaching studies at 310 nm compared to the much lower CE of peak 5 (an electron-only trap) (CE 5→4 = 0.0026 ± 0.012). (ii) The lack of an increase in the sensitivity of glow peak 5a following 2.6 MeV and 6.8 MeV He ion irradiation in 'sensitised' material compared to the factor two increase in the sensitivity of peak 5; (S/S o ) 5a = 0.86 ± 0.12, compared to (S/S o ) 5 = 2.0 ± 0.2. (iii) The late entry into saturation of the 2.6 MeV and 6.8 MeV He ion TL-fluence response curves for peak 5a compared to peak 5 in sensitised and normal material resulting in the following values for the track radial saturation parameter; (r 50 ) 5a = 100 ± 20 Angstroms compared to (r 50 ) 5 = 380 ± 30 Angstroms. (iv) The low value of 0.1 for the 'track-escape' parameter of peak 5a deduced from the Extended Track Interaction Model analysis of He ion TL fluence response compared to order of magnitude greater values for peaks 5 and 5b. |
| Databáze: | OpenAIRE |
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