Low temperature radioluminescence of LiF:Mg,Cu,P

Abstract

Low temperature radioluminescence spectra of LiF, variously co-doped with Mg, Cu and P, show highly unusual temperature dependencies which resemble thermoluminescence data. The signals include intense peaks and a relatively weak continuous background. One peak occurs below 30 K, together with a major peak near 125 K. The signals are highly sensitive to the dopants and slightly sensitive to X-ray dose rate. The role of donor acceptor pairs and the perturbations from intrinsic defects formed by ionisation can be used to describe all the observations. The 290 nm emission band is linked to H center annealing.

Comparison between the low temperature thermoluminescence spectra in annealed LiF:Mg,Cu, LiF:Mg,Cu,P and LiF:Mg,Cu,Si

“…Because the thermal decay temperatures of the H and V K centre are $110 and $130 K in LiF, respectively. Two strong thermal peaks at about 123 and 135 K, respectively were reported in both the 25-280 K radioluminescence (RL) and TL studies of LiF:Mg,Cu,P [9,10]. The origin of those TL signals and the changes of the low temperature TL features in the 240-390°C annealed LiF:Mg,Cu,P samples has also been reported.…”

“…Luminescence of the undoped LiF and LiF-type TLDs below room temperature has also been investigated to gain a better understanding of the defect interactions [8][9][10][11][12][13]. In LiF, the defects such as F, H and V K centres can be produced under the energetic irradiation at low temperatures.…”

Aplicação e avanços da espectroscopia de luminescência em análises farmacêuticas

“…11 Contudo, cabe ressaltar que ainda existem a sonoluminescência, [25][26][27][28] a mecano-ou tribulominescência, [29][30][31][32][33][34] a radioluminescência, [35][36][37][38] a termoluminescência, 34,39,40 a bioluminescência, 41 entre outros. Nesta revisão, serão abordados trabalhos envolvendo a determinação de fármacos baseados em fenômenos fotoluminescentes e quimiluminescentes.…”