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

Y. S. Horowitz, Y. Einav, S. Biderman, L. Oster

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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°C) to peak 4 trap, is very high at a value of 3 ± 0.5 (1 SD) whereas the glow peak conversion efficiency of peak 5 (Tm = 205°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.

Original languageEnglish
Pages (from-to)135-138
Number of pages4
JournalRadiation Protection Dosimetry
Volume100
Issue number1-4
DOIs
StatePublished - 1 Jan 2002

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

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