Erdem UZUN | Karamanoglu Mehmetbey University (original) (raw)

Papers by Erdem UZUN

DergiPark (Istanbul University), Dec 1, 2010

Termolüminesans olay radyasyon dozlarının ölçülmesinde yaygın olarak kullanılan bir yöntemdir. Bu... more Termolüminesans olay radyasyon dozlarının ölçülmesinde yaygın olarak kullanılan bir yöntemdir. Bu yöntem ile radyasyon dozlarının ölçülmesinde dikkat edilmesi gereken en önemli nokta termolüminesans ışımayı belirleyen temel tuzak parametrelerinin belirlenmesidir. Bu parametrelerin belirlenmesi ve termolüminesans ışıma mekanizmasının açıklanması için bugüne kadar birçok model ileri sürülmüştür. Bu çalışmada etkileşimli çoklu tuzak modeli incelenmiş, fiziksel modeli yapılmış, model tarafından ileri sürülen diferansiyel denklemler sayısal yöntemler ile çözülmüş ve sonuçlar gerçek malzemeler ile kıyaslanmıştır. Teorik ve deneysel çalışmalardan elde edilen sonuçlar ışığında bu modelin termolüminesans mekanizmayı açıklamadaki başarısı tartışılmıştır.

Applied Research Frontiers

Türkiye Atom Enerjisi Kurumu, 2011

Iranian Journal of Radiation Research, 2017

Background:The natural radioac vity levels in soil samples of Karadağ Mountain in central Anatoli... more Background:The natural radioac vity levels in soil samples of Karadağ Mountain in central Anatolia region have been determined. Materials and Methods: Analyses on the collected samples were performed to determine gross alpha and beta radioac vity concentra ons by using a gas-flow propor onal counter and the concentra ons of U, Th and K by using a NaI(Tl) scin lla on detector. Results: The es mated ac vi es of gross alpha and beta ranged between 305.155±46.830 and 1305.437±77.23 Bq.kg-1, 479.743±22.658 and 1177.373±30.908 Bq.kg-1, respec vely. The mean ac vity values of U, Th and K radionuclides were found to be 71.6, 83.9 and 451.1 Bq.kg-1, respec vely. Also, known radia on health hazard indices were calculated using radioac vity concentra ons of soil samples. Conclusion: The present results have been compared with the obtained values from other regions in Turkey and the interna onally reported values as well as the reference values. The soil samples in the studied area are safe and...

WOS:000365088100010Non-radiative transitions are one of the important problems for the thermolumi... more WOS:000365088100010Non-radiative transitions are one of the important problems for the thermoluminescence event. One of the models offered to explain non-radiative transition is Schon-Klasens. In this paper, the Schon-Klasens model was discussed both from theoretical and numerical viewpoints. The brief information about mathematical principals of the model was given and differential equations that controlled charge carrier traffic were derived. Some numerical solutions of the model were performed by using variable E-e and E-h parameters. This study has concluded that the glow curve is affected by both charge carriers according to relationship between E-e and E-h parameters

Sigma, 2011

Research Article / Araştırma Makalesi MODELLING OF THERMOLUMINESCENCE TRAP ENERGY LEVELS OF SEYDİ... more Research Article / Araştırma Makalesi MODELLING OF THERMOLUMINESCENCE TRAP ENERGY LEVELS OF SEYDİŞEHİR ALUMUNA ... 1Karamanoğlu Mehmetbey Üniversitesi, Kamil Özdağ Fen Fakültesi, Fizik Bölümü, KARAMAN 2Yıldız Teknik Üniversitesi, Fen-Edebiyat ...

EPJ Web of Conferences, 2015

Bu çalışmada termolüminesans olayı açıklayan birinci mertebeden (FOK), ikinci mertebeden (SOK), g... more Bu çalışmada termolüminesans olayı açıklayan birinci mertebeden (FOK), ikinci mertebeden (SOK), genel mertebeden (GOK) ve etkileşimli çoklu tuzak modeli (IMTs) gözden geçirilmiştir. Modeller tarafından ileri sürülen ve yük taşıyıcı trafiğini ifade eden diferansiyel denklem sistemleri türetilmiştir. Bu lineer olmayan denklem sistemleri herhangi bir ön kabul yapılmadan sayısal olarak çözülmüş ve elde edilen sonuçlar literatür ile karşılaştırılmıştır. Elde edilen sonuçların literatür ile uyumlu olduğu görülmüştür.It is a well-known fact that language and culture is related. That relationship between language and culture in semantic level can be clearly seen in the vocabulary of that particular language. The lexicon of a language reflects traditions, beliefs and the perspectives of the society that use this specific language. Thus changes occur in a society directly effects the language and its lexicon. In the light of that, there has been communication both directly and indirectly betw...

Luminescence : the journal of biological and chemical luminescence, 2021

The Tm -TSTOP and the variable dose methods were applied to alumina experimentally, and then all ... more The Tm -TSTOP and the variable dose methods were applied to alumina experimentally, and then all the steps of the methods were simulated numerically. The Tm -TSTOP experiments were performed between 70-300°C, and results show that the glow curve of the used alumina has six distinct peaks between 40-400°C. The glow curves were analysed by using CGCF programs, the analytical equations were also fitted to the experimental data, and the trapping parameters of the peaks were measured. The samples were irradiated above the saturation level to ensure the complete filling of the electron traps, and thus, the concentrations of traps were measured experimentally. Short term anomalous fading behaviours of the peaks were investigated, and a new equation has been proposed to compute the anomalous fading rate. Besides, the variable dose and Tm -TSTOP methods were simulated by using the six trap-one recombination centre (6T1C) model and the experimental trapping parameters. Results show that there...

$Research paper thumbnail of <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>α</mi></mrow><annotation encoding="application/x-tex">\alpha</annotation></semantics></math>α-Alüminanın 117°C'deki Işıldama Tepesinin Yalıtılarak Elde Edilmesi$

In this study, the peak of glow curve of powdered alumina appearing at 117C was isolated from ot... more In this study, the peak of glow curve of powdered alumina appearing at 117C was isolated from others. In order to check of the suitability of the described procedure some experimental and numerical processes were applied. Trap parameters were determined by using additive dose, peak shape, initial rise and computerized glow curve deconvolution methods. The physical model was established by using interactive multi-trap model and differential equations were derived. The equation system was solved numerically by using experimental trap parameters. A good agreement appeared between the experimental and the numerical results. The results prove that the applied procedure has been successful

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2013

In this study, thermoluminescence (TL) behaviors of some commercial TL dosimetric crystals (MCP-1... more In this study, thermoluminescence (TL) behaviors of some commercial TL dosimetric crystals (MCP-100, MCP-N, MTS-7, MTS-100 and MTS-N) under low and high radiation dose rates are investigated. In addition to this, the effects of different radiation types on the glow curve are also investigated. The peak intensities obtained from samples irradiated at low radiation doses are weaker than samples irradiated at high radiation doses. These results are normal evaluated together with fading experiments. On the other hand, some new glow peaks are observed and changes in peaks intensities are also observed in glow curves of samples exposed to alpha radiation

Bu calisma kapsaminda termoluminesans (TL) isimayi aciklayan bazi temel modeller yeniden gozden g... more Bu calisma kapsaminda termoluminesans (TL) isimayi aciklayan bazi temel modeller yeniden gozden gecirilmis ve numerik olarak cozumlenmistir. Bu amacla her bir model icin yuk tasiyici trafigini ifade eden diferansiyel denklem sistemleri turetilmistir. Bu denklem sistemlerini sayisal olarak cozumleyebilmek icin Mathematica 8.0 bilgisayar programi uzerinde kosturulabilen kodlar yazilmistir. Belirli tuzak parametre degerleri baslangic kosulu olarak bilgisayar programina verilmis ve isildama egrileri elde edilmistir. Termoluminesans tuzak parametrelerinin hesaplanmasinda kullanilan izotermal bozunum (ID) yontemi bir bilgisayar algoritmasi haline donusturulmus ve her bir modele uygulanmistir. Termoluminesans modeller ve izotermal bozunum yontemi kullanilarak tuzak parametreleri numerik olarak hesaplanmistir. Hesaplanan parametreler baslangic kosullari ile karsilastirilmis ve uyum icerisinde olduklari gorulmustur.

Cumhuriyet Science Journal, 2021