On the trapping centres in LiF TLD-100

Thermoluminescence of alkali halides doped with alkaline earth impurities

“…Objections against these models were raised (Horowitz 1982;Battaglia et al 1982;Jain 1983). Moharil (1980) argued that the behaviour of Mg centres in LiF-rLD 100 is different from that shown in figure 1. The bands at 225, 310 and 380 nm are present in as-irradiated crystals even when the irradiation dose is a few rads.…”

“…In XLO-100, the absorption bands related to the Mg impurity occur at 225, 310 and 380nm. Several authors (Nink and Kos 1976;Cooke 1980;Rao 1980;Parfianovich et al 1980;Chandra et al 1982a) attributed these bands to Z centres of Mg. Serious objections have, however, been raised against this interpretation (Moharil 1980). Apart from these Mg related bands, a rather complicated absorption curve is obtained when LiF is subject to various thermal treatments (Tournon and Dabois 1968;Crittenden et al 1974a, b).…”

Some observations on the optical absorption bands in LiF:Mg, Ti

“…A feature of the Z-centres in alkali halides is that they can be produced by photoconversion of F-centres (Okhura 1964, Paus and Strohm 1979, Paus and Scheu 1980, Moharil 1980). In the present work we note that upon illuminating an irradiated TLD-100 sample with uv light of 245 nm, the F-band decreases sharply (figure 4(a)) as does all of the spectrum from around 225 nm to 450 nm.…”

The Defect Structure of New Glow Peak Generated from Heavily Annealed LiF : Mg, Ti

“…The first model interprets dipoles formed by Mg 2 ±cation vacancies as acting trapping centers [4 to 15], and the other model is based on Z-centers formed by pairs of Mg 2 ±electron occupied anion vacancies [16 to 25]. However, both models have been severely criticized by many authors [26,27]. In addition to these models, different trap center models have been also proposed [28 to 30].…”