Spectral comparison of Dy, Tm and Dy/Tm in thermoluminescent dosimeters

Karalı, T.; Rowlands, Alun; Townsend, P. D.; Prokić, M.; Olivares, J.

doi:10.1088/0022-3727/31/6/025

Cited by 56 publications

(41 citation statements)

References 25 publications

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“…Thus, we prefer a more general model 20,[23][24][25][26][27] in which there is a close association of the trap and emission center. Such packages are not unexpected as the rare earth ions differ in valence from the host ions and also differ in size.…”

Section: Discussionmentioning

confidence: 99%

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

et al. 2015

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Thermoluminescence (TL) and radioluminescence (RL) are reported over the temperature range 25-673 K from MgSiO 4 :Tb and MgSiO 4 :Eu. The dominant signals arise from the transitions within the Rare Earth (RE) dopants, with limited intensity from intrinsic or host defect sites. The Tb and Eu ions distort the lattice and alter the stability of the TL sites and the peak TL temperature scales with the Tb and Eu ion size. The larger Eu ions stabilize the trapped charges more than for the Tb, and so the Eu TL peak temperatures are ;20% higher. There are further size effects linked to the TL driven by the volume of the upper state orbitals of the rare earth transitions. For Eu the temperatures of the TL peaks are wavelength dependent since higher excited states couple to distant traps via more extensive orbits. The same pattern of peak temperature data is encoded in RL during heating. The data imply that there are sites in which the rare earth and charge stabilizing defects are closely associated within the host lattice, and the stability of the entire complex is linked to the lattice distortions from inclusions of impurities.

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Section: Discussionmentioning

confidence: 99%

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

et al. 2015

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“…In this paper, we report the TL properties of strontium tetraborate doped with dysprosium, an element widely used as activator in many other phosphors [1,[13][14][15][16][17][18]]. …”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence of SrB4O7:Dy

Santiago

Grasseli

Caselli

et al. 2001

phys. stat. sol. (a)

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Subject classification: 78.60.Kn; S10.15The thermoluminescent properties of polycrystalline Dy doped strontium tetraborate are reported. Its efficiency is at least five times larger than that of TLD-700 and therefore comparable to that of Cu doped lithium tetraborate. The isometric plot shows two spectral bands at approximately 480 and 580 nm like the emission spectra of Dy doped phosphors reported to date.

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“…XIL studies in CaSO 4 : Dy have shown that the XIL spectra arise due to Dy 3+ emission similar to its TSL spectra. XIL in undoped CaSO 4 is dominated by a host lattice related broad emission peaking around 350 nm [15,17,18]. XIL studies in CaSO 4 : Eu/Eu,Na perhaps carried out for the first time show some interesting features.…”

Section: X-ray Induced Luminescence (Xil)mentioning

confidence: 89%

“…These radicals have been detected in ESR spectra and are either formed as a result of radiolysis or more likely due to charge transfer at precursor sites. The intrinsic emission during electron±hole recombination (Karali et al [15] believe it could arise from a relaxed exciton state) during X-irradiation/TSL readout occurs at about 350 nm. Those RE activators in CaSO 4 whose excitation spectra overlaps with this spectrum and whose fluorescence eficiency is high (e.g.…”

Section: X-ray Induced Tslmentioning

confidence: 99%

Thermostimulated Luminescence, Exoelectron Emission and X-Ray Induced Luminescence Studies in CaSO4 : Eu and CaSO4: Eu, Na

Lakshmanan

Tomita

1999

phys. stat. sol. (a)

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X‐ and UV radiation induced thermostimulated luminescence (TSL), thermostimulated exoelectron emission (TSEE) and X‐ray induced luminescence (XIL) studies in CaSO4 : Eu and CaSO4 : Eu, Na reveal that the X‐ray induced TSL peaks exhibit Eu2+ (blue) and Eu3+ (red) emissions — but their relative ratio varies with the peak. In contrast, UV induced TSL peaks exhibit only Eu3+ emission. Even in the CaSO4 : Eu sample, which contains both Eu2+ as well as Eu3+, no Eu2+ emission is seen in all the TSL peaks produced by UV irradiation. These results confirm that the X‐ray induced TSL in these phosphors is best explained by the energy transfer model while UV induced TSL is best explained by the charge transfer model. In CaSO4 : Eu, the X‐ray induced TSEE peak coincides exactly with the 400 K TSL peak whereas the UV induced TSEE is negligible. This indicates an Auger‐like decay of electrons following the self‐absorption of 400 nm Eu2+ emission due to the 400 K TSL peak. Intense XIL in CaSO4 : Eu occurs mainly due to Eu2+ emission which decreases with increasing irradiation temperature from 100 K perhaps due to thermal quenching. But the significant variation in XIL intensity in the temperature interval 350 to 450 K is attributed to Eu2+ → Eu3+ oxidation. XIL in CaSO4: Eu increases with X‐ray intensity but is nearly independent of X‐ray exposure time. These results suggest that XIL emission is probably caused by metastable Eu2+ centers formed during X‐irradiation.

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Spectral comparison of Dy, Tm and Dy/Tm in thermoluminescent dosimeters

Cited by 56 publications

References 25 publications

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Thermoluminescence of SrB4O7:Dy

Thermostimulated Luminescence, Exoelectron Emission and X-Ray Induced Luminescence Studies in CaSO4 : Eu and CaSO4: Eu, Na

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