Mechanism of restored thermoluminescence in lithium fluoride

Kos, H.-J.; Nink, R.

doi:10.1002/pssa.2210440212

Cited by 23 publications

(10 citation statements)

References 9 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These observations indicate that peak 10 is responsible for the sensitization of peak 7. The dependence of sensitization of peak 5 on peak 10 centres (Z3-centres) as proposed earlier Kos and Nink [9] have observed that after UV bleaching (at a UV intensity of 2 mW/cm2, predominantly 253.7 nm) at 300 "C for 1 h, nearly 1/3 of the Z,-band is left unbleached. However, Mayhugh [a] has reported that a UV bleaching (253.7 nm, at an intensity of 3 mW/cm2) at 300 "C for 1 h, the intensity of peak 10 is reduced by a factor of about 100.…”

Section: Discussionsupporting

confidence: 52%

Effect of deep traps on the sensitization in LiF (TLD-100) phosphor

Chandra

Lakshmanan

Bhatt

1980

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

The effect of UV (253.7 nm) bleaching at room temperature (= 25 "C) as well as at 300 "C on the intensity of peak 10 (425 "C), and on radiation induced sensitization of peak 5 (210 "C) and peak 7 (270 "C) is studied in LiF (TLD-100) as a function of UV bleaching time. Intense W irradiation at 300 "C for 1 h almost completely removes the RTL peak 10 (reduced by about a factor of 200) and the sensitization factor (8/8,,) of peak 7 reduces from 35 to 1.1. The decay of peak 10 and the decay of sensitization of peak 7 appear to follow each other very well. On the basis of results presented here it is confirmed that peak 10 is responsible for the sensitization of peak 7. The conversion of peak 10-centres to peak 7-centres is suggested as one of the possible mechanisms for the sensitization of peak 7 during the test y-irradiation of the sensitized sample.Der EinfluB einer W (253,7 nm)-Tilgung bei Zimmertemperatur (e 25 "C) und bei 300 "C auf die Intensitit des Maximum 10 (425 "C) und auf die strahlungsinduzierte Sensibilisierung des Maximum 5 (210 "C) und Maximum 7 (270 "C) wird in LiF (TLD-100) in Abhiingigkeit von der W-Tilgungsdauer untersucht. Eine intensive UV-Bestrahlung bei 300 "C von 1 h beseitigt fast vollstiindig den RTL-Peak 10 (reduziert urn etwa den Faktor 200) und der Sensibilisierungsfaktor (S/S,) von Maximum 7 verringert sich von 35 auf 1,l. Die Abnahme von Maximum 10 und die Abnahme der Sensibilisierung von Maximum 7 scheinen gut aufeinander zu folgen. Auf der Grundlage der vorgelegten Ergebnisse wird bestitigt, daB Maximum 10 fur die Sensibilisierung des Maximum 7 verantwortlich ist. Es wird angenommen, daB die Umwandlung der Maximum-10-Zentren in Maximum-7-Zentren als einer der moglichen Mechanismen fur die Sensibilisierung des Maximum 7 wiihrend der y-Bestrahlung der sensibilisierten Probe darstellt.

show abstract

Section: Discussionsupporting

confidence: 52%

Effect of deep traps on the sensitization in LiF (TLD-100) phosphor

Chandra

Lakshmanan

Bhatt

1980

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

show abstract

“…This should mean that peak 8 traps are also F centre related, similar to those of peaks 6, 7 and 10. It is worth noting that Kos and Nink (1977a) predict the presence of a Z1 centre in LiF:Mg (4.64 eV) very close to the Z 2 centre (4.4 eV). This should imply that either peak 6 or peak 8 is a possible candidate for identification with the Z1 centre in LiF:Mg. Further studies are needed to test this correlation.…”

Section: T L Sensitivity Studies At T = 25 "C and 77 K With Various F...mentioning

confidence: 84%

“…Further, based on TL and optical absorption (OA) data, we have recently correlated the TL peaks 7 (260 "C) and 10 (400 "C) in LiF TLD-100 with Z 2 (280 nm) and Z 3 (225 nm) centres respectively (Lakshmanan et a1 1982, 1983, Lakshmanan 1984. Kos and Nink (1977C) proposed that the migration of Mg2+ and Mg' to F centres leads directly to the formation of Z centres:…”

Section: Introductionmentioning

confidence: 99%

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.

View full text Add to dashboard Cite

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.

show abstract

“…The ease with which these g centres are formed is simply anomalous. Even granting this, it is very strange that Z1 centres, easily formed in other alkali halides, are produced only after 10 hours of F bleaching (Kos and Nink 1977a), and their formation does not lead to any new glow peak. This is in sharp contrast to figure 3.…”

Section: Lif-tlo 100mentioning

confidence: 99%

Thermoluminescence of alkali halides doped with alkaline earth impurities

Deshmukh

Moharil

1985

Bull. Mater. Sci.

View full text Add to dashboard Cite

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.

show abstract

Mechanism of restored thermoluminescence in lithium fluoride

Cited by 23 publications

References 9 publications

Effect of deep traps on the sensitization in LiF (TLD-100) phosphor

Effect of deep traps on the sensitization in LiF (TLD-100) phosphor

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

Thermoluminescence of alkali halides doped with alkaline earth impurities

Contact Info

Product

Resources

About