Thermoluminescence of LiF TLD-100 by phototransfer

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Abstract
The residual trapped charge carriers remaining after incomplete annealing of an irradiated thermoluminescent (TL) sample can be transferred to empty trapping sites by incident ultraviolet (UB) photons. Phototransferred thermoluminescence (PTTL) in LiF TLD-100 was studied as a function of the residual glow curve intensity the photon energy of the incident light and the temperature of the sample during light exposure. It is concluded that the optical activation energies of two of the residual glow peaks are 5.5 and 4.27 eV. The photonically ejected charge carriers (electrons or holes) from the 5.25 eV trap are redistributed in the empty traps in nearly the same proportion as under gamma -ray exposure. However, those from the 4.27 eV trap are preferentially captured in the traps corresponding to the glow peaks for 75 and 100 degrees C. The charge release from the residual traps occurs as a result of the combined effect of excitation by UV photons and thermal stimulation.

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