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

Annalakshmi, O.; Jose, M.T.; Amarendra, G.

doi:10.1016/j.radmeas.2011.06.016

Cited by 57 publications

(20 citation statements)

References 23 publications

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“…1, curve 1). The spectrum is similar to that reported by Kelemen et al (2007), but slightly differs from the photoluminescence spectrum reported by Annalakshmi et al (2011). The excitation spectrum of the 2.03 eV emission consists of two main bands at 7 and 7.54 eV situated in the region adjacent to the fundamental absorption edge of the host (curve 2) and the bands at 3-4 eV (curve 2'), which are weaker by two orders of magnitude.…”

Section: Resultssupporting

confidence: 80%

“…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. Considering that such a dose corresponds to the upper dose linearity limit of the material for irradiation (Annalakshmi et al, 2011), one can conclude that Mn 2+ recharging plays no remarkable role in the energy storage process. We did observe the decrease of the Mn 2+ EPR signal for doses exceeding 2 kGy, however, in this case an irreversible degradation of the material takes place.…”

Section: Resultsmentioning

confidence: 99%

“…Ag + ions co-doped in Li 2 B 4 O 7 :Cu were also shown to be efficient sensitizers for the Cu + emission (Patra et al, 2012). Recently Li 2 B 4 O 7 :Mn was demonstrated to be an efficient dosimetric material with excellent  dose linearity and negligible fading upon storage (Annalakshmi et al, 2011). The red-orange emission of this system is ascribed to the Mn 2+ ion (Ignatovich et al, 2007;Annalakshmi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Recently Li 2 B 4 O 7 :Mn was demonstrated to be an efficient dosimetric material with excellent  dose linearity and negligible fading upon storage (Annalakshmi et al, 2011). The red-orange emission of this system is ascribed to the Mn 2+ ion (Ignatovich et al, 2007;Annalakshmi et al, 2011). However, the data on possible mechanisms of its appearance in recombination luminescence are controversial.…”

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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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recombination luminescence in Li2B4O7 doped with manganese and copper

Nagirnyi

Aleksanyan

Corradi

et al. 2013

Radiation Measurements

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“…Tissue equivalence is an important property for thermoluminescent (TL) dosimeters for estimation of absorbed dose in tissue because the absorbed dose in soft biological tissue exposed to ionizing radiation can be determined more accurately, if the dosimetric material has a similar atomic composition as that of human tissue (7.42); and lithium borate based TL dosimeters are best with an effective atomic number of 7.3 [1,2]. The introduction of a small quantity of dopant into the lithium tetraborate enables its sensitivity to ionizing radiation inÀuence to be increased substantially; the materials show some desirable features for TL in terms of linearity and storage and many of the earlier problems of fading, light sensitivity and poor humidity behavior have been avoided.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and TL characterization of Li[sub 2]B[sub 4]O[sub 7] doped with copper and manganese

Guarneros-Aguilar¹,

Cruz-Zaragoza²,

Marcazzó³

et al. 2013

AIP Conference Proceedings

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Abstract. Copper (Cu) and manganese (Mn) doped tissue equivalent Li 2 B 4 O 7 were prepared by solid state sintering. The glow curves shows a high temperature peak at 222 °C for Li 2 B 4 O 7 :Cu and for Li 2 B 4 O 7 :Mn at 218 °C. Linear dose response is observed up to 140 Gy. With a thermal treatment at 125 °C, the first peak of the phosphors doped with copper (95 °C) and manganese (90 °C) disappears and the main TL peaks remain isolated. The dose rate dependence was studied by exposing the samples at doses of 25 Gy and 250 Gy. At low dose it was observed that the Li 2 B 4 O 7 :Cu TL response has non-dependence on dose rate, and at higher dose was observed that there is a dependence of the TL response with the different dose rate until of 30%. For the case of Li 2 B 4 O 7 :Mn, the TL response has non-dependence on dose rate at low dose or high dose.

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Dosimetric features and kinetic parameters of a glass system dosimeter

Mhareb

Alajerami²,

Alqahtani

et al. 2019

Luminescence

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Lithium borate (LB) glasses doped with dysprosium oxide (Dy 2 O 3 ) have been prepared by utilizing the conventional melt-quench technique. The prepared glass samples were exposed to 60 Co to check their dosimetric features and kinetic parameters.These features involve glow curves, annealing, fading, reproducibility, minimum detectable dose (MDD), and effective atomic number (Z eff ). Kinetic parameters including the frequency factors and activation energy were also determined using three methods (glow curve analysis, initial rise, and peak shape method) and were thoroughly interpreted. In addition, the incorporation of Dy impurities into LB enhanced the thermoluminescence sensitivity~170 times. The glow from LB:Dy appeared as a single prominent peak at 190 C. The best annealing proceeding was obtained at 300 C for 30 min. Signal stability was reported for a period of 1 and 3 months with a reduction of 26% and 31%, respectively. The proposed glass samples showed promising dosimeter properties that can be recommended for personal radiation monitoring. K E Y W O R D Sdosimetric features, kinetic parameters, lithium borate

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

Cited by 57 publications

References 23 publications

Recombination luminescence in Li2B4O7 doped with manganese and copper

Recombination luminescence in Li2B4O7 doped with manganese and copper

Synthesis and TL characterization of Li[sub 2]B[sub 4]O[sub 7] doped with copper and manganese

Dosimetric features and kinetic parameters of a glass system dosimeter

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