Calculation of thermal quenching parameters in BeO ceramics using solely TL measurements

Aşlar, Engin; Meriç, Niyazi; Şahi̇ner, Eren; Kitis, G.; Polymeris, George S.

doi:10.1016/j.radmeas.2017.06.011

Cited by 21 publications

(5 citation statements)

References 31 publications

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“…According to Kitis and Pagonis [ 45 ], in such cases, the large number of re-trappings indicates TL glow curves that are also dominated by the first order of kinetics. The activation energies are slightly larger than 1 eV, in good agreement with the results of the activation energies reported by our group for both TL peaks 2 and 3 [ 4 , 5 , 14 , 15 , 40 ]. Moreover, following TA-OSL, there is no change in the TL glow curve shape of BeO; such a change was quite obvious in both cases of Al 2 O 3 :C and NaCl.…”

Section: Discussionsupporting

confidence: 91%

“…For the case of isothermal TA-OSL, as the entire measurement takes place at a steady temperature T st , the corrected unquenched integrated TA-OSL intensity I uq ( T st ) can be calculated using the following formula:

where I q ( T st ) and I uq ( T st ) are the integrated TA-OSL intensities which are quenched and unquenched, respectively, while η ( T st ) corresponds to a single value of the thermal quenching efficiency at the specific measurement temperature. In this study, reconstruction was applied according to Equation (11), using the values of thermal quenching parameters W and C obtained by Aşlar et al [ 40 ] for the Hoya U340 filter; the specific values used were W = 0.62 eV and C = 1.3 × 10 6 , namely, the values that were calculated for TL peak 2. These values were used because the Hoya U-340 filter was used for all measurements.…”

Section: Methodsmentioning

confidence: 99%

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Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

Polymeris

2023

Materials

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BeO is another luminescent phosphor with very deep traps (VDTs) in its matrix that could not be stimulated using either thermal or conventional optical stimulations. The present study attempts to stimulate these traps using thermally assisted optically stimulated luminescence (TA-OSL), a combination of simultaneous thermal and optical stimulation that is applied to the material following a thermoluminescence measurement up to 500 °C. An intense, peak-shaped TA-OSL signal is measured throughout the entire temperature range between room temperature and 270 °C. This signal can be explained as the transfer of charges from VDTs to both dosimetric TL traps. Experimental features such as the peaked shape of the signal along with the presence of residual TL after the TA-OSL suggest that recombination of TA-OSL takes place via the conduction band. Isothermal TA-OSL is not effective for extending the maximum detection dose thresholds of BeO, unlike minerals such as quartz and aluminum oxide. Nevertheless, TA-OSL could be effectively used in order to either (a) control the occupancy of VDTs, circumventing the intense sensitivity changes induced by long-term uses and high accumulated dose to the VDTs, or (b) measure the total dose accumulated over a series of repetitive dose calculations.

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Section: Discussionsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

Polymeris

2023

Materials

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“…The dimensions and weight of the dosimeter are 4 mm × 4 mm × 1 mm and 32 mg, respectively. This dosimeter was already characterized in terms of TL and OSL kinetics and dose response [1–3]. Indeed, BeO is one of the most promising OSL materials for radiation monitoring and dosimetery.…”

Section: Methodsmentioning

confidence: 99%

“…BeO dosimeters exhibit high sensitivity to ionizing radiation and are reusable, allowing for multiple readouts. OSL and TL kinetics and dose response of the studied BeO dosimeter were extensively studied showing two experimental main peaks recorded at a temperature interval of 200–370°C depending on heating rate and material preparation [1–3]. Regarding the TL response as a function of dose, recent studies show that the first peak obeys to second‐order kinetics and exhibits a quadratic dependence to dose while the second peak is of first‐order kinetics with a linear behaviour with respect to dose [4, 5].…”

Section: Introductionmentioning

confidence: 99%

Effect of IRSL‐BLSL‐TSL reading modes combination on thermoluminescence (TL) response of BeO dosimeter

Kharfi,

Şahiner,

Benkhelifa

et al. 2024

Luminescence

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The ultimate goal of this work is the study of the effect of luminescence stimulations and signals reading modes combinations on the thermoluminescence intensity and glow curve behaviour for the same X‐ray irradiation dose. Three interesting stimulating and reading modes are considered, namely, infrared stimulated luminescence (IRSL), blue light‐emitting diode stimulated luminescence (BLSL) and thermally stimulated luminescence (TSL). The studied stimulation and reading modes combination protocols are (Protocol 1) IRSL‐TSL, (Protocol 2) IRSL‐BLSL‐TSL and (Protocol 3) BLSL‐IRSL‐TSL. Experiments are performed on beryllium oxide (BeO) dosimeter. Results demonstrate well that the combination of reading modes have direct impact on the TL signal in terms of intensity and glow curve shape. It was also found that when reading modes are correctly combined, particularly when IRSL is applied first, then BLSL and TL, it is possible to collect two or more exploitable signals of different stimulation types for the same irradiation that can be used for different purposes and final applications.

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“…Therefore, thermal quenching studies are of great importance not only for candidate dosimetric materials but also for the dosimeters in luminescence dosimetry research. The existence of a thermal quenching effect can be identified by monitoring the TL glow curves obtained at different heating rates under the same amount of radiation exposure [4]. Thermal quenching can also be understood with the change in the OSL signal obtained at different reading temperatures and luminescence lifetime measurements [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermal Quenching Effect for Lithium Fluoride (LiF) Type Dosimeters

Aşlar

2023

Cumhuriyet Science Journal

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Thermal quenching is described as a decrease in luminescence efficiency with increasing measurement temperature. Luminescence intensity decreases with increasing heating rates in the presence of thermal quenching. In such a case, the heating rate to be used in the measurements becomes important. Lithium fluoride (LiF) type dosimeters have been widely used in radiation dosimetry for many years. In this study, thermal quenching effect was investigated for LiF:Mg,Ti (TLD-100) and LiF:Mg,Cu,P (TLD-100H), 6LiF:Mg,Ti(TLD-600) and 7LiF:Mg,Ti (TLD-700) at two different doses (10, 1000mGy) using 90Sr/90Y beta source. TLD-100, TLD-600 and TLD-700 showed different thermal quenching behaviors according to dose values, while TLD-100H had the same characteristics at both doses. On the other hand, other dosimeters showed thermal quenching based on the total area at 10mGy, while they did not show thermal quenching when ROI was used. Again, thermal quenching was not observed at 1000mGy for all dosimeters. In conclusion, it is recommended to use ROI or low heating rate during measurements at a low dose (in the order of mGy) for TLD-100, TLD-600 and TLD-700, while desired heating rate can be used at a high dose (Gy) for all dosimeters.

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Calculation of thermal quenching parameters in BeO ceramics using solely TL measurements

Cited by 21 publications

References 31 publications

Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

Effect of IRSL‐BLSL‐TSL reading modes combination on thermoluminescence (TL) response of BeO dosimeter

Investigation of Thermal Quenching Effect for Lithium Fluoride (LiF) Type Dosimeters

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