The effect of optical bleaching at selected photon energies on the thermoluminescence of LiF:Mg,Ti

2016 International Conference on Defects in Insulating Materials

Reshes, G.^1 ; Druzhyna, S.^2 ; Biderman, S.^3 ; Eliyahu, I.^4 ; Oster, L.^1 ; Horowitz, Y.S.^5

Physics Unit, Sami Shamoon College of Engineering, Beersheva, Israel^1

Nuclear Engineering Unit, Ben Gurion University of the Negev, Beersheva, Israel^2

Nuclear Research Center-Negev, Beersheva, Israel^3

Nuclear Physics and Engineering Department, Soreq Nuclear Research Center, Yavne, Israel^4

Physics Department, Ben Gurion University of the Negev, Beersheva, Israel^5

关键词: Electron hole;    Geminate recombination;    Glow peaks;    LiF:Mg , Ti;    Optical absorption energies;    Optical bleaching;    Photon energy;    TLD-100;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/169/1/012016/pdf
DOI  :  10.1088/1757-899X/169/1/012016

来源: IOP

【 摘 要 】

A new interpretation of the optical absorption energy spectrum of LiF:Mg,Ti (TLD-100) is presented in which the 4.0 eV band is composed of two-sub-bands at 3.8 eV and 4.3 eV. The new interpretation is of central importance in the understanding of the geminate recombination mechanisms giving rise to composite glow peak 5 in the thermoluminescence (TL) of TLD-100. Photon bleaches at energies of 3.6 eV and 4.3 eV on samples of gamma irradiated TLD-100 were carried out in order to investigate the correlation of the 4.3 eV absorption band with the electron-hole configuration giving rise to glow peak 5a and the 3.8 eV absorption band with the e-only configuration giving rise to glow peak 5. The 4.3 eV bleach decreases peak 5a dramatically and increases peak 4 (a hole-only configuration). No such effect is observed following the 3.6 eV bleach. The results strongly support the suggested structures giving rise to the 4.3 eV and 3.8 eV bands observed in the optical absorption energy spectrum.