Thermoluminescence of Z centres in LiF (TLD-100) at elevated irradiation temperatures

Lakshmanan, A.; Chandra, Bhuwan; Bhatt, Ramesh Chandra

doi:10.1002/pssa.2210750130

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Whether Mg directly captures electrons or whether just perturbs the electron centres, characteristic of the host lattice, is to be decided. Several papers (Mort 1965;Nink and Kos 1976;Parfianovich et al 1976;Nink 1977a, b,c,d, 1979, 80;Mehta et al 1977;Kos and Mieke 1978;Kos and Takeuchi 1980;Rao 1980;Jain 1981c;Lakshmanan et al 1983) support the latter view. The idea ofZ centres of Mg started with the suggestion (Mort 1965;Mort and Zimmerman 1966) that the empirical Mollow-Ivey relation for Z 3 centres in alkali halides predicts the Z3 band in LiF:Mg at 225nj.…”

Section: Lif-tlo 100mentioning

confidence: 99%

“…In later work, a correlation between 285 C peak and 225 nm band was attempted (Gartia 1977;Kos and Nink 1979), but Bapat and Kathuria (1981) and Jain (1981 c) have shown that the 225 nm band is not totally annealed out during 285 C peak, it vanishes only after 400 C; and hence the earlier assignment is correct. In recent years, the 285 C peak has been correlated with the 310 nm band (Lakshmanan et al 1982a(Lakshmanan et al , 1983Chandra et al 1982a).…”

Section: Lif-rto 100mentioning

confidence: 99%

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Thermoluminescence of alkali halides doped with alkaline earth impurities

Deshmukh

Moharil

1985

Bull. Mater. Sci.

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Doping with alkaline earth impurities converts the alkali halides into very efficient phosphors. LiF doped with Mg is extensively used in radiation dosimetry. However, the phenomenon of thermoluminescence in these materials is far from dear. LiF-TLD 100 is artificially separated from the rest of the alkali halide phosphors. The available experimental data are not fully utilised in building a model for thermoluminescence processes. In this review, thermoluminescence properties of LiF-TLD 100 and other alkali halide phosphors are discussed. The comparative study which points out several common points could be useful in understanding the TL processes in these phosphors.

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Section: Lif-tlo 100mentioning

confidence: 99%

Section: Lif-rto 100mentioning

confidence: 99%

Thermoluminescence of alkali halides doped with alkaline earth impurities

Deshmukh

Moharil

1985

Bull. Mater. Sci.

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Optical absorption and thermoluminescence studies in LiF:Mg,Ti(TLD-100) single crystals as a function of irradiation temperature

Lakshmanan

Madhusoodanan

1993

Phys. Stat. Sol. (a)

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Optical absorption (OA) and thermoluminescence (TL) studies are carried out in LiF: Mg, Ti(TLD‐100) single crystals as a function of irradiation temperature (Tirr) from 77 to 523 K. While the variation in 310 nm OA and peak 5 (≈498 K) TL with Tirr from 77 to 385 K is within ± 7%, the portion of 250 nm OA corresponding to peak 7 (≈ 573 K) and peak 7 TL increases drastically with Tirr from 77 to 435 K. The latter result confirms that the OA of peak 7 centres occurs at 250 nm and that the radiolysis process is involved in the creation of these defect centres. Due to thermal fading, the peak 7 TL and the above 250 nm OA decrease proportionally beyond Tirr = 435 K confirming further the above correlation. A major outcome of this study is that two different defect centres – (i) centres giving rise to peak 7 and (ii) isolated F centres not related to any of the TL peaks above room temperature – give rise to OA at the same or two positions close to 250 nm.

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Thermoluminescence studies in LiF dosimeter irradiated at 77K and their implications on theoretical models

Lakshmanan

Chandra

Bhatt

et al. 1985

J. Phys. D: Appl. Phys.

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In LiF:Mg, Ti dosimeters, gamma -irradiation at low temperature (77K) reduces the TL intensities of peaks 7 (260 degrees C) and 10 (450 degrees C) drastically whereas the TL intensity of peak 5 (200 degrees C) remains nearly the same as that after irradiation at room temperature (RT). This implies that during irradiation, interstitial migration is involved in the formation of traps giving rise to peaks 7 and 10. The generic nature of peaks 7 (Z2) and 10 (Z3) traps and their (Z2 to or from Z3) trap conversion are further demonstrated. Since diffusion processes are inhibited, F and Z centres are not formed efficiently in LiF dosimeters irradiated at 77K. Studies on supralinearity, sensitisation, thermal history, optical absorption, optical bleaching, phototransfer and LET dependence following irradiation at RT and at 77K imply that four different processes (competing nonluminescent centre, track interaction during read-out, Z centre and mobile interstitial) are operating simultaneously to varying extents during the trapping/luminescent stage of different TL glow peaks. The photon emission mechanisms of these peaks are discussed. The claim that supralinearity of peak 5 is related to Z3 production is disproved. Further studies on Z centre identification in LiF:Mg, Ti are indicated.

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Thermoluminescence of Z centres in LiF (TLD-100) at elevated irradiation temperatures

Cited by 3 publications

References 17 publications

Thermoluminescence of alkali halides doped with alkaline earth impurities

Thermoluminescence of alkali halides doped with alkaline earth impurities

Optical absorption and thermoluminescence studies in LiF:Mg,Ti(TLD-100) single crystals as a function of irradiation temperature

Thermoluminescence studies in LiF dosimeter irradiated at 77K and their implications on theoretical models

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