Papers by Neslihan Ekinci
Asian Journal of Chemistry, 2013
The influence of analysis time on detection limits in energy dispersive X-ray spectrometry was ex... more The influence of analysis time on detection limits in energy dispersive X-ray spectrometry was experimentally investigated. We utilized a high resolution Si(Li) detector (full width half maximum=160 eV at 5.9 keV) with a Camberra DSA-1000 desktop spectrum analyzer and Am-241 and Cd-109 radioactive point sources to collect X-ray spectra. The results showed that the detection limit decreased with increasing analysis time.
Asian Journal of Chemistry, 2017
Measurements of indoor radon have a critical role in monitoring human health and safety. In this ... more Measurements of indoor radon have a critical role in monitoring human health and safety. In this study, measurements of radon in the houses of Bingöl and Mus provinces and in their surrounding villages were performed by using CR-39 nuclear track detectors. Bingöl and Mus Provinces of Turkey have the severe terrestrial climate with hot and dry summers and cold and snowy winters for a long period. Therefore, people who spend much of their time at home have a greater risk for being exposed. The CR-39 detectors were placed in the selected 77 dwellings of Bingöl in the 2013 winter season and in 91 dwellings of Mus in 2012 winter season. Before the setup of detector, we had filled up a detailed questionnaire form to survey construction parameters and properties of the houses and living conditions of inhabitants. Detectors collected two month later were read and treated by Radosys Electronic equipment in Turkish Atomic Energy Agency Laboratory. The indoor radon concentrations in Bingöl and Mus provinces are found to vary from 43 to 348 Bq/m 3 with an average of 103 Bq/m 3 and from 25 to 604 Bq/m 3 an average of 108 Bq/m 3 , respectively.
Radiation Effects and Defects in Solids
Asian Journal of Chemistry, 2016
Journal of Radioanalytical and Nuclear Chemistry, 2003
The aim of this study was to determine the concentration of trace elements present in Sar kam " o... more The aim of this study was to determine the concentration of trace elements present in Sar kam " ore by the standard addition method. The elements determined were Ca, Ti, Fe, Sr, Ba. The equipment used for this study was a Si(Li)-detector, a multichannel analyzer and 55 Fe and 241 Am radioisotope sources. The physical basis of the analytical method used, the procedure of sample preparation and the results are presented.
Applied Radiation and Isotopes, 2016
In this paper, we have studied the intensity ratios Kβ/Kα depending on the temperature for transi... more In this paper, we have studied the intensity ratios Kβ/Kα depending on the temperature for transition elements Mo, Nb, Zr and Y by 59.5keV γ-rays from a 100 mCi (241)Am radioisotope point source. The Kα and Kβ emission spectra of Mo, Nb, Zr and Y were measured by using a Si (Li) solid-state detector at temperature between 40 and 400°C. σKα and σKβ production cross-sections, Kβ/Kα intensity ratios, asymmetry factor, energy shifts and full width half maximum (FWHM) values of the elements have been calculated. Temperature-dependent changes of the parameters are tabulated and given in the graphical forms. Based on the results obtained, Kβ/Kα X-ray intensity ratios of the elements are dependent on the temperature. It is shown that σKβ fluorescence cross sections of Mo, Nb and Zr have more increase rate than σKα fluorescence cross sections with increasing temperature. For Y, σKα and σKβ production cross-sections firstly decrease, then increase. In general, Kβ/Kα X-ray intensity ratios tend to increase with increasing temperature. Some significant shifts are observed in Kα and Kβ emission spectra of Mo and Y. These results may contribute to the XRF studies of transition metals.
Spectrochimica Acta Part B Atomic Spectroscopy, 2002
Energy dispersive X-ray fluorescence techniques were used to analyze gall bladder stones. Enrichm... more Energy dispersive X-ray fluorescence techniques were used to analyze gall bladder stones. Enrichment of Ca and I was observed in the gall bladder stone taken from a patient. The concentration of Ca has been determined with an annular Fe radioactive source and the concentration of I with an annular Am radioactive source using the standard 55 241 addition method in 2p geometry. A Si(Li)-detector was used to measure Ca and I concentrations in the gall bladder stones.
Journal of Radioanalytical and Nuclear Chemistry, Apr 1, 2004
Mankind still depend on traditional herbal medicine for the treatment of various diseases and ail... more Mankind still depend on traditional herbal medicine for the treatment of various diseases and ailments. This paper discusses the elemental composition and concentration of medicinal plants investigated by energy dispersive X-ray fluorescence. The elements present in medicinal plants are P,
International journal of radiation biology, Jan 28, 2016
Recently, there has been an increase in interest into research into radioprotective agents. Radio... more Recently, there has been an increase in interest into research into radioprotective agents. Radioprotectors are compounds that protect against radiation injury when given orally (through drinking water) prior to radiation exposure. The purpose is to achieve preferred protection of normal tissues against injury inflicted by ionizing radiation used to treat tumors. The main aim of this work is to investigate energy absorption (EABF) and exposure buildup factors (EBF) of commonly used some radioprotective agents. We have used the Geometric Progression (G-P) fitting method for calculating the equivalent atomic number (Zeq), for EABF and EBF buildup factors of the radioprotective agents in the energy range 0.015-15 MeV for penetration depths up to 40 mean free path. Significant variations in both EABF and EBF values were observed for several agents at the moderate energy region. At energies below 0.1 MeV, EABF and EBF values increased with decreasing equivalent atomic number Zeq of the s...
Radiation Measurements, Jun 1, 2002
A method is presented to determine the coating thickness on a metallic substrate in energy disper... more A method is presented to determine the coating thickness on a metallic substrate in energy dispersive X-ray uorescence. The method is based on the measurement of incoherent scattered radiation. Energy dispersive XRF apparatus includes a ÿltered Am 241 point source and an Si(Li) detector with resolution 160 eV at 5:9 keV. The thicknesses of the coating materials found by the scattered radiation have been compared with thicknesses found by the gravimetric method. The obtained results show that there is good agreement between the present experimental results and the values of the gravimetric method within the estimated experimental error.
Instrum Sci Technol, 2001
X-ray fluorescence analysis techniques can be applied to determine sample thickness by either abs... more X-ray fluorescence analysis techniques can be applied to determine sample thickness by either absolute or relative methods. An absolute method for thickness determination by x-ray fluorescence analysis has been devised, based on two types of independent measurements of the ...
International Journal of Research in Pharmacy and Chemistry
Abstract Analgesics are used in the treatment of a wide variety of medical conditions. This paper... more Abstract Analgesics are used in the treatment of a wide variety of medical conditions. This paper discusses the elemental composition and concentration of analgesic drugs by wavelenght dispersive X-ray fluorescence. Physical basis of used analytical method, experimental set up and the procedure of sample preparation are presented. The complete results of this investigation are given in Table 1. The presence of C, O, Mg, Si, Cl, Ti, Fe, Na, S, Ni, P, K, Pd, Ca, Mn, Al, Cr elements in analgesic drugs were found. The relative errors for results have been given 7 %. Wavelength-dispersive X-ray fluorescence spectrometry is a proven technique to determine the presence of various elements in analgesic drugs.
Applied Radiation and Isotopes, 2014
Human radiation exposure is increasing due to radiation development in science and technology. Th... more Human radiation exposure is increasing due to radiation development in science and technology. The development of radioprotective agents is important for protecting patients from the side effects of radiotherapy and for protecting the public from unwanted irradiation. Radioprotective agents are used to reduce the damage caused by radiation in healthy tissues. There are several classes of radioprotective compounds that are under investigation. Analgesics and antiinflammatory compounds are being considered for treating or preventing the effects of damage due to radiation exposure, or for increasing the chance of survival after exposure to a high dose of radiation. In this study, we investigated the radioprotective effects of some analgesic and antiinflammatory compounds by evaluating buildup factors. The gamma ray energy absorption (EABF) and exposure buildup factors (EBF) were calculated for select compounds in a 0.015-15 MeV energy region up to a penetration depth of 40 mfp (mean free path). Variations of EABF and EBF with incident photon energy and penetration depth elements were also investigated. Significant variations in both EABF and EBF values were observed for several compounds at the moderate energy region. At energies below 0.15 MeV, EABF and EBF values increased with decreasing equivalent atomic number (eq Z) of the samples. In addition, EABF and EBF were the largest for ibuprofen, aspirin, paracetamol, naproxen and ketoprofen at 0.05 and 0.06 MeV, respectively, and the EABF value was 0.1 MeV for aceclofenac. From these results, we concluded that the buildup of photons is less for aceclofenac compared to other materials.
Instrumentation Science & Technology, 1999
A procedure for the determination of the thickness of Au and Ag films and foils coated on a metal... more A procedure for the determination of the thickness of Au and Ag films and foils coated on a metallic Cu foil (substrate) is described. The procedure is based on the measurements of the fluorescence intensity ratios for two lines from the substrate element, excited by 59.5 keV photons emitted from a filtered Am-241 radioisotope source. The result of the procedure
Spectrochimica Acta Part B: Atomic Spectroscopy, 2002
Energy dispersive X-ray fluorescence techniques were used to analyze gall bladder stones. Enrichm... more Energy dispersive X-ray fluorescence techniques were used to analyze gall bladder stones. Enrichment of Ca and I was observed in the gall bladder stone taken from a patient. The concentration of Ca has been determined with an annular Fe radioactive source and the concentration of I with an annular Am radioactive source using the standard 55 241 addition method in 2p geometry. A Si(Li)-detector was used to measure Ca and I concentrations in the gall bladder stones.
Spectrochimica Acta Part B: Atomic Spectroscopy, 1998
Chemical effects on the LcdL{3 X-ray intensity ratio of Ba, La and Ce were investigated. The vaca... more Chemical effects on the LcdL{3 X-ray intensity ratio of Ba, La and Ce were investigated. The vacancies in the L shell were created by 59.5 keV y-rays from an Am-241 radioactive source and the L X-rays were measured using a Si(Li) detector with resolution 160 eV at 5.9 keV. The experimental values are given with the theoretical values of the pure elements.
Radiation Measurements, 2002
A method is presented to determine the coating thickness on a metallic substrate in energy disper... more A method is presented to determine the coating thickness on a metallic substrate in energy dispersive X-ray uorescence. The method is based on the measurement of incoherent scattered radiation. Energy dispersive XRF apparatus includes a ÿltered Am 241 point source and an Si(Li) detector with resolution 160 eV at 5:9 keV. The thicknesses of the coating materials found by the scattered radiation have been compared with thicknesses found by the gravimetric method. The obtained results show that there is good agreement between the present experimental results and the values of the gravimetric method within the estimated experimental error.
Radiation Measurements, 2012
The effective atomic number and effective electron density in amino acids are of significant inte... more The effective atomic number and effective electron density in amino acids are of significant interest due to their use in various applications. The energy absorption buildup factors, exposure buildup factors, effective atomic numbers, and electron densities of essential amino acids such as Leucine (C 6 H 13 NO 2), Lysine (C 6 H 14 N 2 O 2), Methionine (C 5 H 11 NO 2 S), Phenylalanine (C 9 H 11 NO 2), Threonine (C 4 H 9 NO 3), Tryptophan (C 11 H 12 N 2 O 2), Valine (C 5 H 11 NO 2), Arginine (C 6 H 14 N 4 O 2), and Histidine (C 6 H 9 N 3 O 2) were determined theoretically in the energy range 0.015-15 MeV.
Journal of Radioanalytical and Nuclear Chemistry, 2000
Mankind still depend on traditional herbal medicine for the treatment of various diseases and ail... more Mankind still depend on traditional herbal medicine for the treatment of various diseases and ailments. This paper discusses the elemental composition and concentration of medicinal plants investigated by energy dispersive X-ray fluorescence. The elements present in medicinal plants are P,
Journal of Quantitative Spectroscopy and Radiative Transfer, 2002
A study was made on the determination of elemental composition of the bread improver using energy... more A study was made on the determination of elemental composition of the bread improver using energydispersive X-ray uorescence. Enrichment of I and Ca was seen in the bread improver. Concentration of I with an annular 241 Am radioactive source and concentration of Ca with an annular 55 Fe radioactive source were determined by using standard addition method in 2 geometry. A Si(Li) detector and a multichannel analyzer were used to measure I and Ca concentrations in the bread improver.
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Papers by Neslihan Ekinci