Kinetic Parameters of Thermoluminescence Dosimetric Peak of YBO3 Phosphor

Abstract

The aim of this study is to determine the thermoluminescence (TL) kinetic parameters of pure yttrium borate (YBO3) phosphor. The YBO3 phosphor synthesized by combustion reaction was converted into pellet form and TL measurements were made. The samples exposed to the beta dose in the range of 0.1-5 Gy were heated from room temperature to 500°C at a constant rate of 2°C/s. TL glow curves of the sample were obtained for both different doses and various heating rates. The current peak shape (PS), various heating rates (VHR) and glow curve deconvolution (GCD) methods were used to calculate the trap parameters of the TL dosimetric peak centered at 210°C by analyzing the obtained TL signals. When Chen's PS method was applied to TL peak displayed in different doses, the average activation energy (E) and frequency factor (s) were found to be 0.847 eV and in the order of 107 s-1. The E and s values obtained using two different VHR methods were 1.050 ± 0.05 eV and in the order of 109 ± 103 s-1 for one and 0.890 eV and in the order of 108 s-1 for the other. The GCD method was applied using the 'tgcd' package of the R-studio program. As a result of applying deconvolution to the peak maximum obtained in beta doses of 0.5 and 5 Gy, two peaks matching the 1st order kinetics were obtained. The E values of the deconvolved peaks (peak 1) were found as 0.889 and 0.868 eV whereas the s values were in the order of 108 s-1.

Keywords

• Yttrium borate,Thermoluminescence,Activation energy,Frequency factor

YBO3 Fosforunun Termolüminesans Dozimetrik Pikinin Kinetik Parametreleri

Abstract

Bu çalışmanın amacı, katkısız itriyum borat (YBO3) fosforunun termolüminesans (TL) kinetik parametrelerini belirlemektir. Yanma reaksiyonu ile sentezlenen YBO3 fosforu pelet formuna getirilerek TL ölçümleri gerçekleştirilmiştir. Örnekler, 0,1-5 Gy aralığında beta dozuna maruz bırakılarak 2°C/s’lik sabit hızla oda sıcaklığından 500°C’ye kadar ısıtılmıştır. Örneğe ait TL ışıma eğrileri, hem farklı dozlar hem de farklı ısıtma hızları için elde edilmiştir. Elde edilen TL sinyalleri analiz edilerek 210°C’de merkezlenen TL dozimetrik pikinin tuzak parametrelerinin hesaplanması için mevcut pik şekli (PS), farklı ısıtma hızları (VHR) ve ışıma eğrisi ayrıştırma (GCD) metotları kullanılmıştır. Farklı dozlarda sergilenen TL pikine Chen’in PS metodu uygulandığında ortalama aktivasyon enerjisi (E) 0,847 eV, frekans faktörü (s) 107 s-1 mertebesinde bulunmuştur. İki farklı VHR metodu kullanılarak elde edilen E ve s değerleri, biri için sırasıyla 1,050 ± 0,05 eV ve 109 ± 103 s-1 mertebesinde diğeri için 0,890 eV ve 108 s-1 mertebesinde bulunmuştur. GCD metodu R-studio programının ‘‘tgcd’’ paketi kullanılarak uygulanmıştır. Ayrıştırma, 0,5 ve 5 Gy beta dozlarından elde edilen pik maksimuma uygulanmış ve 1. dereceden kinetiğe uyan iki pikten oluştuğu görülmüştür. Ayrıştırılmış piklerin (pik 1) E değerleri sırasıyla 0,889 ve 0,868 eV olarak bulunurken s değerleri ise her ikisi için de 108 s-1 mertebelerinde bulunmuştur.

Keywords

• İtriyum borat (YBO3),Termolüminesans,Aktivasyon enerjisi,Frekans faktörü

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