Canel Eke

Determination of gamma-ray energies and half lives of platinum radio-isotopes by photon activation using a medical electron linear accelerator: a feasibility study

In this study, we attempted to determine the gamma-ray energies and half lives of platinum radio-isotopes produced by photo-neutron reactions. Platinum was irradiated with bremsstrahlung of a clinical electron linear accelerator (c-linac). To determine characteristic gamma-ray energies and half lives of platinum radio-isotopes high resolution spectroscopy was applied. Gamma energies and half lives were measured and compared with reliable literature values for 191Pt, 195mPt and 197Pt.

Study of filling material of dental composites: an analytical approach using radio-activation

Abstract The aim of this study is to carry out elemental analyses of dental composites acquired from different producers using photoactivation analysis (PAA). High energy electrons produced by an electron linear accelerator are absorbed by a tungsten disk (Bremsstrahlung converter) thereby producing high energy X-rays (bremsstrahlung). The dental composite materials under study were exposed to the bremsstrahlung radiation whereby radionuclides were produced through photonuclear reactions. Their radioactivities were measured using high resolution semiconductor spectrometers equipped with high purity germanium detectors (HPGe). The spectra were analysed using appropriate computer software. As a result, photonuclear reactions of 12 stable elements were detected in different dental composite species, and the elemental concentrations were calculated. For comparison, the dental composites were also investigated using scanning electron microscopy (SEM) and energy-dispersive X-ray fluorescence spectrometry (EDXRF). Various sizes and shapes of dental composites were observed using SEM. However, contents of dental composites, e.g. Mg, Ni, Ba and Sr were obtained by PAA whilst C, O, Al, S, Ba and Sr were detected by EDXRF spectrometry. The results for Ba and Sr obtained using the two techniques show considerable difference.

Photon activation analysis of sand samples from Antalya in Turkey with a clinical electron linear accelerator

Abstract The purpose of this study is to demonstrate the feasibility of elemental analysis of sand samples by photon activation induced by high energy bremsstrahlung photons at an end point energy of 18 MeV from a clinical electron linear accelerator. The γ-ray spectra of the activated samples were collected using a high resolution spectrometer. Qualitative analysis of major and trace components of the samples (12 in total) was carried out whilst the spectra of eight of the samples were evaluated quantitatively. The contents of elements obtained by photon activation analysis were compared with values obtained by X-ray fluorescence.

Attenuation properties of radiation shielding materials such as granite and marble against γ-ray energies between 80 and 1350 keV

Abstract In this study, the γ-ray energy-dependent mass and linear attenuation coefficients of various granite and Turkish marble species have been experimentally obtained. Radionuclides (133Ba, 137Cs, 60Co and 22Na) with point geometry were used as γ-ray sources. The absorption capacity of each sample at nine γ-ray energies was measured using a high resolution γ-ray spectrometer equipped with a high purity germanium (HPGe) detector. To obtain the precision of the results (1σ standard deviation of the single value), this procedure was repeated six times for each species of granite and marble, respectively. The energy-dependent mass attenuation coefficient (MAC), linear attenuation coefficient (LAC), the half (HVL) and the tenth value layer (TVL) were calculated following that the MAC and LAC results were compared to the literature values.

Photoactivation Analysis of Mineral Trioxide Aggregate: Preliminary Results

Exchange Bias Effect in NdFeO3 System of Nanoparticles M. Vavraa,b,∗, M. Zentková, M. Mihalik, M. Mihalik Jr., J. Lazúrová, V. Girman, M. Perovic, V. Kusigerski, P. Roupcova and Z. Jaglicic Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia P.J. Šafárik University, Faculty of Science, Košice, Slovak Republic The Vinca Institute, University of Belgrade, 11001 Belgrade, Serbia Institute of Physics of Materials, ASCR, Zizkova 22, Brno, Czech Republic MPM & FGG, Jadranska 19, 1000 Ljubljana, Slovenia

Determination of naturally occurring radionuclides in soil samples of Ayranci, Turkey

The specific activity, radiation hazard index and the annual effective dose of the naturally occurring radioactive elements (238U, 232Th and 40K) were determined in soil samples collected from 12 different locations in Ayranci region by using a NaI(Tl) gamma-ray spectrometer. The measured activity concentrations of the natural radionuclides in studied soil samples were compared with the corresponding results of different countries and the internationally reported values. From the analysis, it is found that these materials may be safely used as construction materials and do not pose significant radiation hazards.

Dependence of activity concentration of natural and artificial radionuclides on depth in soil samples from Antalya in Turkey

In this study, we attempt to determine the dependence of activity concentration of natural (238U, 232Th, 40K) and artificial (137Cs) radionuclides on depth in soil samples from Antalya in Turkey. Soil samples were collected at different depths (0-10 cm, 10-30 cm, 30-50 cm, 50-70 cm, 70-100 cm and 100-200 cm). Each soil samples were counted by using a high purity Germanium detector (HpGe). For each soil sample, activity concentration, absorbed dose rate, radium equivalent activity, external and internal hazard index were calculated and compared with the published results.