The fading of optical absorption bands in TLD lithium fluoride

Jackson, J H; Harris, Andrew

doi:10.1016/0375-9601(69)90341-7

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…The irradiation-induced absorption spectra of most of the samples studied consist predominately of absorption bands at 250 nm, the F-centre, and near 310 nm and 380 nm arising from traps associated with the presence of Mg. The work of Jackson and Harris (1969) correlated the emptying of the 310 nm trap with glow peaks 4 and 5 in TLD-100, and the 380nm trap with glow peaks 2 and 3. Figure 7 shows the irradiation-induced 310 nm absorption in three 13 mm crystals sections cut from crystals having the composition of samples 111, IV and VI.…”

Section: Optical Absorption Measurementsmentioning

confidence: 99%

Preparation of thermoluminescent lithium fluoride

Rossiter¹,

Rees-Evans²,

Ellis³

1970

J. Phys. D: Appl. Phys.

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The preparation of lithium fluoride with thermoluminescence properties suitable for use in radiation dosimetry has been investigated. Variants based on magnesium and titanium additions have been prepared and examined from the viewpoint of activator concentration, role of secondary impurity and purity of the lithium fluoride starting material. The following properties were examined, impurity distribution and luminescence distribution within the crystal, emission spectrum, dose response characteristics and optical absorption. A sensitive thermoluminescent preparation may be obtained by the addition of magnesium alone to a readily available source of lithium fluoride.

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Section: Optical Absorption Measurementsmentioning

confidence: 99%

Preparation of thermoluminescent lithium fluoride

Rossiter¹,

Rees-Evans²,

Ellis³

1970

J. Phys. D: Appl. Phys.

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“…Simultaneous measurement of thermally stimulated conductivity (TSC) and TSL is one of the common methods of trap parameter evaluation. , In particular, it can be used for the determination of the probability coefficients for recombination processes . Correlation between the prominent TSL peaks and the derivative of the temperature dependence of the optical absorption of color centers is another technique regularly used to study the trap populations in dosimetry materials …”

Section: Introductionmentioning

confidence: 99%

“…16 Correlation between the prominent TSL peaks and the derivative of the temperature dependence of the optical absorption of color centers is another technique regularly used to study the trap populations in dosimetry materials. 17 In this work we estimate the charge carrier capture rates in Lu 1 Gd 2 Ga 3 Al 2 O 12 :Ce garnet ceramics, annealed in oxygen atmosphere. The evaluation procedure consists of solving a system of rate equations which describe the competition between Ce 4+ ions and traps for the capture of conduction band (CB) electrons.…”

Section: ■ Introductionmentioning

confidence: 99%

Complex Garnets: Microscopic Parameters Characterizing Afterglow

et al. 2019

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Light yield, time response, afterglow, and thermoluminescence of Ce-doped garnet scintillators and persistent luminescent materials are controlled by a complex interplay between recombination and trapping/detrapping processes. Extensive research has contributed to a good qualitative understanding of how traps, impurities, and the presence of Ce4+ affect the materials properties. In this work we present a quantitative model that can explain the thermoluminescence and afterglow behavior of complex garnets. In particular, the model allows the determination of capture rates and effective capture radii for electrons by traps and recombination centers in Lu1Gd2Ga3Al2O12:Ce garnet ceramics. The model relies on solving a set of coupled rate equations describing charge carrier trapping and recombination in garnet ceramics doped with Ce and also codoped with a known concentration of an intentionally added electron trap, Yb3+. The model is supported by analysis of a complete set of experimental data on afterglow, rise-time kinetics, and X-ray excited luminescence which show that thermoluminescence/afterglow are governed by trapping/detrapping processes following interactive kinetics with dominant recombination channel. The underlying reason for dominant recombination is the presence of a small fraction of Ce4+ (≈2 ppm in the 0.2% Ce-doped sample) which have a very high capture cross section (≈2.7 Å effective radius) because of the Coulomb attractive nature of this recombination center. The quantitative insights on capture cross sections and concentrations of Ce4+ help to better understand the optical properties of Ce-doped garnet scintillators and persistent luminescent materials and serve in optimizing synthesis procedures by tuning the Ce3+/Ce4+ ratio by codoping with divalent cations and annealing in an oxygen-containing atmosphere.

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“…It is clear that Hwang's analysis produces extremely low frequency factors, compared with those obtained by Jackson and Harris (1969) for the other glow peaks in TLD-100. One also finds that the activation energies are too low for the 370 and 430°C peaks when compared with the simple estimate of E=25kTmax.…”

mentioning

confidence: 83%