Kasim Kurt | Mersin University (original) (raw)

Papers by Kasim Kurt

Journal of Luminescence, 2017

The objective of this work was to develop a new optically stimulated luminescence (OSL) material ... more The objective of this work was to develop a new optically stimulated luminescence (OSL) material for dosimetry applications that is tissue equivalent and has high sensitivity to ionizing radiation, fast luminescence lifetime, and intrinsic neutron sensitivity. To achieve this combination of properties, we started with a host material with low effective atomic number, MgB 4 O 7 (Z eff ¼ 8.2) , with an appropriate dopant characterized by short luminescence lifetime (Ce 3 þ). The samples were synthesized using Solution Combustion Synthesis with excess boric acid to achieve the correct crystallographic phase and Li co-doping to enhance its sensitivity. We investigated the thermoluminescence (TL) and OSL properties as a function of annealing temperature, radiation dose, dopant concentration, and time elapsed after irradiation (i.e., signal fading). We also applied a step-annealing procedure to investigate the depth of the trapping centers associated with the OSL signal. The samples obtained are characterized by a dominant TL peak at $ 210°C with intensity comparable to LiF:Mg,Ti. The OSL intensity is $ 50% of that from Al 2 O 3 :C when using Hoya U-340 filters and shows no saturation up to almost 1 kGy. The OSL signal seems to originate from trapping center with stability 4 150°C, which means that the OSL fading is expected to be small. After the first day, in which fading associated with shallow traps is observed, fading of the total OSL signal was o4% within 6 days. The possibility of enhancing the neutron sensitivity was also demonstrated by synthesizing the material with enriched 10 B. Although further development and characterization of the material may be needed, this work demonstrates that this host/dopant combination can be a viable alternative in OSL dosimetry, particularly for 2D dose mapping and neutron dosimetry applications.

Journal of Natural Sciences Research, 2014

Distribution of natural radionuclide gamma rays produced by 232 Th, 226 Ra and 40 K, were determi... more Distribution of natural radionuclide gamma rays produced by 232 Th, 226 Ra and 40 K, were determined for the sand collected along the cost of Mersin in Akkuyu. Gamma radiation in beach sand samples collected from Akkuyu nuclear power plant region has been measured by NaI(Tl) gamma ray spectrometer. Gamma spectrometer has been calibrated with IAEA reference set which were RGK, RGU and RGTH. The radioactivity concentration of were calculated and expressed in Bqkg-1. The source of cause for the total doses of beach sand was formed due to three primordial radionuclide which were 232 Th, 226 Ra and 40 K. The activity of radionuclide were between 3.96-17.18, 15.82-39.48 and 133.54-287.06Bqkg-1 respectively. Radiological hazard, radium equivalent, external hazard and total dose rate were also calculated. Results were discussed with UNCEAR reports.

Journal of Physics: Condensed Matter, 2003

Page 1. Detection of phase transitions in RbTiOPO4 and KTiOPO4 by luminescence This article has b... more Page 1. Detection of phase transitions in RbTiOPO4 and KTiOPO4 by luminescence This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2003 J. Phys.: Condens. Matter 15 7599 (http://iopscience.iop.org/0953-8984/15/44/013) ...

Journal of Luminescence, 2017

The objective of this work was to develop a new optically stimulated luminescence (OSL) material ... more The objective of this work was to develop a new optically stimulated luminescence (OSL) material for dosimetry applications that is tissue equivalent and has high sensitivity to ionizing radiation, fast lumi-nescence lifetime, and intrinsic neutron sensitivity. To achieve this combination of properties, we started with a host material with low effective atomic number, MgB 4 O 7 (Z eff ¼ 8.2) , with an appropriate dopant characterized by short luminescence lifetime (Ce 3 þ). The samples were synthesized using Solution Combustion Synthesis with excess boric acid to achieve the correct crystallographic phase and Li co-doping to enhance its sensitivity. We investigated the thermoluminescence (TL) and OSL properties as a function of annealing temperature, radiation dose, dopant concentration, and time elapsed after irradiation (i.e., signal fading). We also applied a step-annealing procedure to investigate the depth of the trapping centers associated with the OSL signal. The samples obtained are characterized by a dominant TL peak at $ 210 °C with intensity comparable to LiF:Mg,Ti. The OSL intensity is $ 50% of that from Al 2 O 3 :C when using Hoya U-340 filters and shows no saturation up to almost 1 kGy. The OSL signal seems to originate from trapping center with stability 4 150 °C, which means that the OSL fading is expected to be small. After the first day, in which fading associated with shallow traps is observed, fading of the total OSL signal was o4% within 6 days. The possibility of enhancing the neutron sensitivity was also demonstrated by synthesizing the material with enriched 10 B. Although further development and characterization of the material may be needed, this work demonstrates that this host/dopant combination can be a viable alternative in OSL do-simetry, particularly for 2D dose mapping and neutron dosimetry applications.

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2006

The additive dose (AD), Tm( Ea)- Tstop, repeated initial rise (RIR), peak shape (PS) and computer... more The additive dose (AD), Tm( Ea)- Tstop, repeated initial rise (RIR), peak shape (PS) and computerized glow curve deconvolution (CGCD) methods were used to analyze the thermoluminescence (TL) glow peaks in natural zircon after β-irradiation between the dose level 0.015 Gy and ≈ 10 kGy. The CGCD and Ea- Tstop methods indicate that the glow curve of this material is the superposition of at least seven glow peaks, which were referred to as P1-P7, in the temperature range between room temperature (RT) and 400 °C. The dose responses and fading process of individual TL peaks of this material were also examined. The dose response behaviors of all peaks are different from each other and they are saturated at different dose levels. Peaks 1 and 2 completely disappeared after 1 month storage in the dark room at RT. On the other hand, the intensity of peaks 3 + 4 was approximately reduced to 80% of its original value whereas the other peaks (P5-P7) were not sufficiently affected during this period.

Journal of Luminescence, 2017

The objective of this work was to develop a new optically stimulated luminescence (OSL) material ... more The objective of this work was to develop a new optically stimulated luminescence (OSL) material for dosimetry applications that is tissue equivalent and has high sensitivity to ionizing radiation, fast luminescence lifetime, and intrinsic neutron sensitivity. To achieve this combination of properties, we started with a host material with low effective atomic number, MgB 4 O 7 (Z eff ¼ 8.2) , with an appropriate dopant characterized by short luminescence lifetime (Ce 3 þ). The samples were synthesized using Solution Combustion Synthesis with excess boric acid to achieve the correct crystallographic phase and Li co-doping to enhance its sensitivity. We investigated the thermoluminescence (TL) and OSL properties as a function of annealing temperature, radiation dose, dopant concentration, and time elapsed after irradiation (i.e., signal fading). We also applied a step-annealing procedure to investigate the depth of the trapping centers associated with the OSL signal. The samples obtained are characterized by a dominant TL peak at $ 210°C with intensity comparable to LiF:Mg,Ti. The OSL intensity is $ 50% of that from Al 2 O 3 :C when using Hoya U-340 filters and shows no saturation up to almost 1 kGy. The OSL signal seems to originate from trapping center with stability 4 150°C, which means that the OSL fading is expected to be small. After the first day, in which fading associated with shallow traps is observed, fading of the total OSL signal was o4% within 6 days. The possibility of enhancing the neutron sensitivity was also demonstrated by synthesizing the material with enriched 10 B. Although further development and characterization of the material may be needed, this work demonstrates that this host/dopant combination can be a viable alternative in OSL dosimetry, particularly for 2D dose mapping and neutron dosimetry applications.

Journal of Natural Sciences Research, 2014

Distribution of natural radionuclide gamma rays produced by 232 Th, 226 Ra and 40 K, were determi... more Distribution of natural radionuclide gamma rays produced by 232 Th, 226 Ra and 40 K, were determined for the sand collected along the cost of Mersin in Akkuyu. Gamma radiation in beach sand samples collected from Akkuyu nuclear power plant region has been measured by NaI(Tl) gamma ray spectrometer. Gamma spectrometer has been calibrated with IAEA reference set which were RGK, RGU and RGTH. The radioactivity concentration of were calculated and expressed in Bqkg-1. The source of cause for the total doses of beach sand was formed due to three primordial radionuclide which were 232 Th, 226 Ra and 40 K. The activity of radionuclide were between 3.96-17.18, 15.82-39.48 and 133.54-287.06Bqkg-1 respectively. Radiological hazard, radium equivalent, external hazard and total dose rate were also calculated. Results were discussed with UNCEAR reports.

Journal of Physics: Condensed Matter, 2003

Page 1. Detection of phase transitions in RbTiOPO4 and KTiOPO4 by luminescence This article has b... more Page 1. Detection of phase transitions in RbTiOPO4 and KTiOPO4 by luminescence This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2003 J. Phys.: Condens. Matter 15 7599 (http://iopscience.iop.org/0953-8984/15/44/013) ...

Journal of Luminescence, 2017

The objective of this work was to develop a new optically stimulated luminescence (OSL) material ... more The objective of this work was to develop a new optically stimulated luminescence (OSL) material for dosimetry applications that is tissue equivalent and has high sensitivity to ionizing radiation, fast lumi-nescence lifetime, and intrinsic neutron sensitivity. To achieve this combination of properties, we started with a host material with low effective atomic number, MgB 4 O 7 (Z eff ¼ 8.2) , with an appropriate dopant characterized by short luminescence lifetime (Ce 3 þ). The samples were synthesized using Solution Combustion Synthesis with excess boric acid to achieve the correct crystallographic phase and Li co-doping to enhance its sensitivity. We investigated the thermoluminescence (TL) and OSL properties as a function of annealing temperature, radiation dose, dopant concentration, and time elapsed after irradiation (i.e., signal fading). We also applied a step-annealing procedure to investigate the depth of the trapping centers associated with the OSL signal. The samples obtained are characterized by a dominant TL peak at $ 210 °C with intensity comparable to LiF:Mg,Ti. The OSL intensity is $ 50% of that from Al 2 O 3 :C when using Hoya U-340 filters and shows no saturation up to almost 1 kGy. The OSL signal seems to originate from trapping center with stability 4 150 °C, which means that the OSL fading is expected to be small. After the first day, in which fading associated with shallow traps is observed, fading of the total OSL signal was o4% within 6 days. The possibility of enhancing the neutron sensitivity was also demonstrated by synthesizing the material with enriched 10 B. Although further development and characterization of the material may be needed, this work demonstrates that this host/dopant combination can be a viable alternative in OSL do-simetry, particularly for 2D dose mapping and neutron dosimetry applications.

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2006

The additive dose (AD), Tm( Ea)- Tstop, repeated initial rise (RIR), peak shape (PS) and computer... more The additive dose (AD), Tm( Ea)- Tstop, repeated initial rise (RIR), peak shape (PS) and computerized glow curve deconvolution (CGCD) methods were used to analyze the thermoluminescence (TL) glow peaks in natural zircon after β-irradiation between the dose level 0.015 Gy and ≈ 10 kGy. The CGCD and Ea- Tstop methods indicate that the glow curve of this material is the superposition of at least seven glow peaks, which were referred to as P1-P7, in the temperature range between room temperature (RT) and 400 °C. The dose responses and fading process of individual TL peaks of this material were also examined. The dose response behaviors of all peaks are different from each other and they are saturated at different dose levels. Peaks 1 and 2 completely disappeared after 1 month storage in the dark room at RT. On the other hand, the intensity of peaks 3 + 4 was approximately reduced to 80% of its original value whereas the other peaks (P5-P7) were not sufficiently affected during this period.