Storage mechanism and OSL-readout possibility of Li2B4O7:Mn (TLD-800)

Danilkin, M. I.; Jaek, I.; Kerikmäe, M.; Lust, A.; Mändar, Hugo; Pung, L.; Ratas, Arno; Seeman, V.; Klimonsky, S. O.; Kuznetsov, V. D.

doi:10.1016/j.radmeas.2010.01.045

Cited by 21 publications

(23 citation statements)

References 2 publications

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“…Mn 2þ amount decreases by irradiations near saturation dose and its dependence is well-correlated with a destruction (recharging) of Mn 2þ by radiation. Mn 2þ amount decreases only at very high doses but stays unchanged at lower doses (Danilkin et al, 2010).…”

Section: Photon Dose Responsementioning

confidence: 92%

Dosimetric characteristics of manganese doped lithium tetraborate – An improved TL phosphor

Annalakshmi

Jose

Amarendra

2011

Radiation Measurements

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Section: Photon Dose Responsementioning

confidence: 92%

Dosimetric characteristics of manganese doped lithium tetraborate – An improved TL phosphor

Annalakshmi

Jose

Amarendra

2011

Radiation Measurements

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“…4 (for demonstration purposes a high dose of about 11 kGy was used). In addition to the Mn 2+ lines seen in non-irradiated samples (Danilkin et al, 2010) a new sextet structure with a splitting of the order of 1 mT can be discerned in the region 325-330 mT. This may correspond to a radiation centre with the unpaired spin having super-hyperfine interaction with a neighbouring Mn nucleus.…”

Section: Resultsmentioning

confidence: 80%

“…By analysing the EPR signal in non-irradiated LTB:Mn exhibiting partly resolved hyperfine splittings of the order of several mT (Danilkin et al, 2010) it has been shown that Mn 2+ can occupy two different sites, substituting for a Li + ion or breaking the boron-oxide network and substituting for a B 3+ in a fourfold-coordinated site. No decrease of this EPR signal was observed under X-irradiation (53 kV, 15 mA) of LTB:Mn ceramics up to the dose of 1 kGy.…”

Section: Resultsmentioning

confidence: 99%

“…It was suggested that a Mn 2+ ion can trap a hole upon irradiation turning it to Mn 3+ and then recombine with a thermally released electron giving rise to the Mn 2+ luminescence (Ignatovich et al, 2012). On the other hand, no recharging of Mn ions has been registered by the method of electron paramagnetic resonance (EPR) within the region of irradiation dose linearity, and hole trapping at a bridging oxygen adjacent to a Mn 2+ at a tetrahedrally coordinated B 3+ position has been suggested (Danilkin et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Recombination luminescence in Li2B4O7 doped with manganese and copper

Nagirnyi

Aleksanyan

Corradi

et al. 2013

Radiation Measurements

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HIGHLIGHTSDoped Li 2 B 4 O 7 ceramics were studied by EPR and optical spectroscopy.In Li 2 B 4 O 7 :Mn ceramics Mn 2+ emission is observed for the TSL peaks at 90 and 490 K.We propose the release of holes to be responsible for the dosimetric peak at 490 K. AbstractNon-irradiated and irradiated ceramics of Li 2 B 4 O 7 :Mn, Li 2 B 4 O 7 :Mn,Be, and Li 2 B 4 O 7 :Mn,Cu were studied using electron paramagnetic resonance and luminescence spectroscopy. The emission of Mn 2+ centres is observed in the thermoluminescence spectra of the lowtemperature and dosimetric high-temperature glow peaks in irradiated samples. Arguments are given in favour of hole mobility being responsible for the dosimetric thermoluminescence peak at 490 K in Li 2 B 4 O 7 :Mn. The co-doping of Li 2 B 4 O 7 :Mn with Cu + is shown to increase the sensitivity of the material to ionizing radiation.

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“…Our previous study [19] proved the decrease of the Mn 2+ amount (estimated by EPR) at high radiation doses. At the same time, the amount of Mn 2+ was found to be unchanged at doses up to 1-2 kGy.…”

Section: Introductionmentioning

confidence: 71%

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

Ratas¹,

Danilkin²,

Kerikmäe³

et al. 2012

Proc. Estonian Acad. Sci.

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Thermoluminescence curves, kinetics, and Electron Paramagnetic Resonance (EPR) data were compared for Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors. Analysis of the experimental data, both our own and published by other investigators, in connection with features of the crystal lattice structure allowed us to build models of traps and thermoluminescence mechanisms. The thermoluminescence peaks used in dosimetry are connected with the release of holes trapped at bridging oxygen near Mn 2+ (or Be 2+ ), substituting for tetrahedrally coordinated B 3+ . The luminescence occurs at Mn 2+ substituting for Li + . Two types of Mn 2+ centres give different luminescence and EPR spectra. The effects of Mn 2+ interaction with surrounding oxygen atoms are discussed both for the Mn 2+ luminescence band and for the hyperfine structure of EPR. Kinetics measurements revealed an additional "hopping" barrier for a hole to get to a recombination centre after it has been released from a trap. A simple kinetics model is suggested to describe the experimental data. The studies of optical stimulation spectra and optically stimulated emptying of traps demonstrated the possibility of using Li 2 B 4 O 7 :Mn and Li 2 B 4 O 7 :Mn,Be radiation detectors with optically stimulated readout systems.

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Storage mechanism and OSL-readout possibility of Li2B4O7:Mn (TLD-800)

Cited by 21 publications

References 2 publications

Dosimetric characteristics of manganese doped lithium tetraborate – An improved TL phosphor

Dosimetric characteristics of manganese doped lithium tetraborate – An improved TL phosphor

Recombination luminescence in Li2B4O7 doped with manganese and copper

Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms

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Storage mechanism and OSL-readout possibility of Li2B4O7:Mn (TLD-800)

Cited by 21 publications

References 2 publications

Dosimetric characteristics of manganese doped lithium tetraborate – An improved TL phosphor

Dosimetric characteristics of manganese doped lithium tetraborate – An improved TL phosphor

Recombination luminescence in Li2B4O7 doped with manganese and copper

Li2B4O7:Mn for dosimetry applications: traps and mechanisms

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Li₂B₄O₇:Mn for dosimetry applications: traps and mechanisms