Hüseyin Yalim - Academia.edu (original) (raw)

Papers by Hüseyin Yalim

Radiation Measurements, Mar 1, 2007

Afyonkarahisar is located in the mid-west Anatolia in Turkey where Akşehir fault zone lies. This ... more Afyonkarahisar is located in the mid-west Anatolia in Turkey where Akşehir fault zone lies. This earthquake active zone has produced earthquakes in magnitudes from 3.0 to 7.1 in Richter scale. The 222 Rn concentrations in well waters near the fault zone in Afyonkarahisar and its surroundings were determined for the first time. Samples were studied with a Packard Tri-Carb 2770TR/SL model liquid scintillation analyzer. The measured values ranged from 0.7 to 31.7 Bq/L.

Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi, 2017

Abstract: Cu radioisotopes of copper are used for various applications in diagnostic or therapeut... more Abstract: Cu radioisotopes of copper are used for various applications in diagnostic or therapeutic nuclear medicine. These radioisotopes’ wide range of half-lives enable designing and synthesizing of various radiopharmaceuticals. Because of availability and cost of production, the research efforts in copper radiopharmaceuticals are focused on the calculations of reaction cross sections showing the possibility of the productivity in this process. In this paper, excitation functions of copper radioisotopes have been investigated through the theoretical calculation of reaction cross sections by using TALYS nuclear reaction code in the incident particle energy up to 50 MeV.

Fen ve mühendislik bilimleri dergisi, Jun 22, 2023

Sulfur hexafluoride (SF6) is a widely used insulator in the industry, but it also has a high glob... more Sulfur hexafluoride (SF6) is a widely used insulator in the industry, but it also has a high global warming potential. Studying electron impact ionization of SF6, particularly measuring the energy and angular distributions of the collision products, can provide valuable information about the underlying physics of the collision process and the nature of SF6 molecule. In this study, double differential cross sections (DDCSs) for electron impact ionization of SF6 have measured using a crossed beam experimental setup. The incident electron beam, with an energy range of 50-350 eV, was directed towards a target gas composed of SF6, and scattered electrons were detected as a function of the energy and scattering angle. The findings of this study offer significant insights into the molecular structure of SF6 and will contribute to enhancing the understanding of charged particle interactions involving SF6.

Nucleation and Atmospheric Aerosols, 2018

Radiation Protection Dosimetry, Aug 19, 2010

The aim of this study is to measure the radon ((222)Rn) concentrations in drinking water and rive... more The aim of this study is to measure the radon ((222)Rn) concentrations in drinking water and river water in the region of Tokat city in Turkey. The measurements were performed by analysing the water samples collected from tap water, spring water and Yesilırmak river water flowing through the centre of the city of Tokat. The obtained radon concentrations ranged from 0.48 ± 0.22 to 1.30 ± 0.27 Bq l(-1) in tap water, from 0.13 ± 0.17 to 1.20 ± 0.29 Bq l(-1) in spring water and from 0.09 ± 0.12 to 0.83 ± 0.17 Bq l(-1) in the Yesilirmak river water. The results are presented and compared with other studies. From these data, the average effective dose equivalent from radon in tap water and in spring water has been estimated as 5.0 and 3.0 µSv y(-1), respectively.

Süleyman demirel üniversitesi fen-edebiyat fakültesi fen dergisi, Nov 30, 2019

Radon is a tasteless, odorless, colorless radioactive noble gas which is produced in the decay ch... more Radon is a tasteless, odorless, colorless radioactive noble gas which is produced in the decay chain of uranium existed in the rock layer. Since radon is in the gas form, it is more mobile than its parent radionuclides which namely are uranium and radium. Therefore, radon can easily escape soil and rocks through the pores between the soil granules, and the openings in the rock, cracks, and fractures. Because of these characteristics, changes in radon concentration levels are commonly used for seismological purposes. The aim of this study is to investigate the relationship between the radon activity concentration in soil gas on Akşehir fault zone and the vertical distance of the sampling points to the fault zone. For this purpose, radon activity concentrations were monthly determined at 10 sampling points during six-month period. Although no significant correlation can be seen for all sampling points at all, a correlation coefficient of 0.96 was obtained when only the six of sampling points taken into account.

Arabian Journal of Geosciences, Apr 1, 2018

Afyonkarahisar is a very important geothermal province of western Anatolia and has low and medium... more Afyonkarahisar is a very important geothermal province of western Anatolia and has low and medium enthalpy geothermal areas. This study has been carried out for the preparation of distribution maps of soil gases (radon and carbon dioxide) and shallow soil temperature and the exploration of permeable tectonic regions associated with geothermal systems and reveal the origins of radon and carbon dioxide gases. The western district of the study area is characterized by the high radon concentration (168.30 kBq/ m 3), carbon dioxide ratio (0.30%), and soil temperature (21.0°C) values. Fethibey and Demirçevre faults, which allow the circulation of geothermal fluids, have been detected in the distribution maps of radon, carbon dioxide, and shallow depth temperature and the directions of the curves in these maps correspond to the strikes of Demirçevre faults. The effect of the fault plays an important role in the change of carbon dioxide concentration along the WE directional geological section prepared to determine the change of soil gas and shallow depth temperature values depending on lithological differences, fault existence, and geothermal reservoir depth. On the other hand, it was determined that Rn 222 concentration and soil temperature changed as a function of geothermal reservoir depth or lithological difference. Tuffs in Köprülü volcano-sedimentary units are the main source of radon due to their higher uranium contents. Besides, the carbon dioxide in Ömer-Gecek soils has geothermal origin because of the highest carbon dioxide content (99.3%) in non-condense gas. The similarities in patterns of soil temperature, radon, and carbon dioxide indicate that the variation in soil temperatures is related to radon and carbon dioxide emissions. It is concluded that soil gas and temperature measurements can be used to determine the active faults in the initial stage of geothermal exploration successfully.

Radiation Protection Dosimetry, Feb 1, 2009

This paper presents the results of radon ((222)Rn) concentrations in drinking water and river wat... more This paper presents the results of radon ((222)Rn) concentrations in drinking water and river water. In this respect, water samples were collected in the city of Amasya, inner parts of the Median Black sea region in Turkey and the Yeşilirmak River flowing through Amasya city centre. It was found that the concentrations in tap water, spring water and the Yeşilirmak River water in Amasya ranged from 0.42 +/- 0.14 to 2.4 +/- 0.32 Bq l(-1), 0.39 +/- 0.19 to 1.17 +/- 0.21 Bq l(-1) and 0.28 +/- 0.04 to 1.08 +/- 0.30 Bq l(-1), respectively. From these data, the average effective dose equivalent from radon in tap water has been estimated as 5.87 microSv y(-1).

Fen ve mühendislik bilimleri dergisi, Aug 31, 2022

İnsanlar genelde zamanlarının %90'dan daha büyük bir kısmını kapalı ortamlarda geçirmektedirler. ... more İnsanlar genelde zamanlarının %90'dan daha büyük bir kısmını kapalı ortamlarda geçirmektedirler. Kapalı ortamlarda radona maruz kalma sağlık açısından önemli bir problem olabilmektedir. Bu çalışmada Afyon Kocatepe Üniversitesi Ahmet Necdet Sezer Kampüsü'nde 6 fakülte binasında, çalışanların ve öğrencilerin sağlık risklerini değerlendirmek ve yıllık etkin doz eşdeğerlerini hesaplamak için radon konsantrasyonları ölçülmüştür. Ölçümler aktif ölçüm metoduyla ölçüm yapan Genitron marka AlphaGUARD PQ2000 PRO Radon Detektör Sisteminde gerçekleştirilmiştir. Fakülte binalarının radon konsantrasyonu değerleri 4.48-82.00 Bqm-3 ; ortalama radon konsantrasyonları ise 20.64-30.91 Bqm-3 aralığında belirlenmiştir. Tüm binaların ortalama radon konsantrasyonu 24.79 Bqm-3 olarak hesaplanmıştır. 6 fakülte binasının yıllık etkin doz eşdeğerleri 0.16-0.24 mSvy-1 aralığında belirlenmiş, ortalama yıllık etkin doz eşdeğeri ise 0.20 mSvy-1 olarak hesaplanmıştır. Elde edilen sonuçlar, kapalı ortamlarda radon gazı konsantrasyonları için Uluslararası Radyolojik Koruma Komisyon (ICRP) ve Türkiye Atom Enerjisi Kurumu (TAEK) tarafından tavsiye edilen limit değerlerle karşılaştırılmıştır. ANS Kampüsü'ndeki 6 fakülte binasının radon konsantrasyonlarının ölçüm sonuçları ve yıllık etkin doz eşdeğerleri, kuruluşlar tarafından izin verilen limit değerlerinin altında belirlenmiştir.

Journal of Physics B, Jul 20, 1999

Excitation of the 2p state of hydrogen by 54.4 eV electrons is studied experimentally using the s... more Excitation of the 2p state of hydrogen by 54.4 eV electrons is studied experimentally using the scattered electron-decay photon angular correlation technique. At small scattering angles previous experimental results and a range of theoretical calculations are confirmed. At large scattering angles, the present data consistently support these theoretical models but do not agree with previous angular correlation data at this energy. This fundamental discrepancy between experiment and theory for the simplest electron excitation process in the simplest atom is therefore resolved in favour of theory.

Radiation Protection Dosimetry, May 17, 2013

Radon concentration measurements were performed in four spas used for therapy, drinking and irrig... more Radon concentration measurements were performed in four spas used for therapy, drinking and irrigation purposes in the Amasya basin in Turkey, during a period of time between January 2009 and May 2010. The measurements were done using commercially available WG-1001 Vacuum Water Degassing System and the AB-5R Radiation Monitor manufactured by Pylon Electronics. The observed radon concentration values ranged from 0.11 to 0.71 Bq L⁻¹. Effective doses from inhalation of radon released from spa waters have been estimated between 0.28 and 1.78 μSv y⁻¹ .

Modern Physics Letters A, Aug 30, 2019

In this study, the level density parameter and the gamma ray strength function effects on photone... more In this study, the level density parameter and the gamma ray strength function effects on photoneutron reaction cross-section calculations for Osmium isotopes were investigated by employing available level density models and gamma ray strength functions within Talys v1.8 and Empire v3.1 nuclear codes. A relative variance analysis was done to determine the best gamma ray strength function. Then, the effect of level density models for the photoneutron reactions was investigated by using the best gamma ray strength function. The results were compared with each other and also with the experimental data taken from the literature.

Physical Review Letters, Oct 20, 1997

Excitation of the 2p state of atomic hydrogen by electron impact was studied using the electronph... more Excitation of the 2p state of atomic hydrogen by electron impact was studied using the electronphoton angular correlation technique with the aim of resolving a long-standing and serious discrepancy between theories and previous experiments at large scattering angles. At a scattering angle of 100 ± , where the discrepancy was greatest, the present result shows excellent agreement with the theoretically predicted correlations. [S0031-9007(97)04312-3]

DergiPark (Istanbul University), Mar 1, 2002

Early measurements of atomic excitation by electron scattering observed either the scattered elec... more Early measurements of atomic excitation by electron scattering observed either the scattered electron or decay photon. An excited state can not be completely defined by such experiments due to loss of information. Therefore a new method was developed in the early 70's called the correlation method. The new correlation method involves the detection of both the scattered electron and photon arising from the same collision using coincidence techniques. This method enables a full description of an excited state. In this paper, we give a discussion of to the method and its application to excitation of the 2p state of atomic hydrogen.

Journal of Environmental Radioactivity, Aug 1, 2012

Radon concentrations were measured in water of 4 wells on the Akş ehir-Simav Fault System (ASFS) ... more Radon concentrations were measured in water of 4 wells on the Akş ehir-Simav Fault System (ASFS) in Afyonkarahisar province from August 2009 to September 2010 and the relationship between radon anomalies and earthquake magnitudes was examined. Anomalous decreases in radon concentrations in the wells were observed to precede the earthquakes of magnitudes ranging from 2.6 M to 3.9 M. The correlation coefficients (R 2) were 0.79, 0.93, 0.98 and 0.90 for the wells from 1 to 4, respectively, indicating that radon minima and earthquake magnitude were well correlated and suggesting that the groundwater radon, when observed at suitable sites, can be a sensitive tracer for strain changes in crust associated with earthquake occurrences. The relationship between the two parameters can be further improved as additional radon anomalies precursor to possible large earthquakes are recorded in the wells located on the ASFS in the future. This study strongly suggests that the continuous observations of radon concentrations in well water, especially at well 3, should be carried forward.

In this work, Zr, I, Pr, Au and Pb photoneutron reaction cross sections were calculated by using ... more In this work, Zr, I, Pr, Au and Pb photoneutron reaction cross sections were calculated by using TALYS 1.6 computer code near the peak of the giant dipole resonance. The calculated results were compared with the measured values available in the literature. Similarities and discrepancies among previous studies were discussed.

Ozet: Bu calismada, 197Au(I³,n)196Au reaksiyonunun tesir kesiti Esinir = 8,071 MeV enerji siniri ... more Ozet: Bu calismada, 197Au(I³,n)196Au reaksiyonunun tesir kesiti Esinir = 8,071 MeV enerji siniri civarinda hesaplandi. Hesaplamalar daha onceki deneysel veri ve hesaplamalar ile karsilastirildi ve genel uyum icerisinde oldugu goruldu. Ayrica197Au(I³,n)196Au reaksiyon olusum uygunlugu tartisildi. Anahtar kelimeler: Tesir kesiti, reaksiyon, sinir Calculation of the (I³,n) reaction cross section around the threshold for 197Au nucleus Abstract: In this work, 197Au(I³,n)196Au reaction cross section haave been calculated around the reaction threshold at Ethr= 8,071 MeV by using TALYS 1.6 computer code. The results are compared with previous measurements and calculations. Moreover the relevance 197Au(I³,n)196Au reaction is discussed. Key words: Cross Section, reaction, threshold

Arabian Journal of Geosciences, 2020

An indoor radon activity concentration survey has been carried out at 46 houses in Afyonkarahisar... more An indoor radon activity concentration survey has been carried out at 46 houses in Afyonkarahisar province of Turkey using CR-39 passive nuclear track detectors four times during a 1-year period. The measured values ranged from 21 to 2494 Bq m −3 , whereas the calculated average values were in the range of 33.75 and 1614.26 Bq m −3. On the other hand, the calculated annual geometric mean value was 186.50 ± 10.55 Bq m −3 and it was 136.07 ± 8.76 Bq m −3 when only the living areas of the houses considered. The corresponding annual effective dose rates were obtained to be in the range of 0.53 and 25.45 mSv year −1. The resulting annual effective dose equivalent calculated from the geometric mean was 2.94 ± 0.17 mSv year −1 for Afyonkarahisar province, while the annual effective dose in the living areas of the houses was obtained to be 2.15 ± 0.14 mSv year −1. According to the floor levels, the concentration value was found to be between 86.60 ± 7.80 Bq m −3 and 291.80 ± 14.60 Bq m −3. The present results show an exponential decrease with the distance from the soil having the correlation coefficient of R 2 = 0.988.

Afyon Kocatepe University Journal of Sciences and Engineering

People generally spend more than 90% of their time indoors. Exposure to radon in indoor environme... more People generally spend more than 90% of their time indoors. Exposure to radon in indoor environments can be a significant health problem. In this study, radon concentrations were measured to evaluate the health risks of employees and students in 6 faculty buildings in Afyon Kocatepe University Ahmet Necdet Sezer Campus and to calculate annual effective dose equivalents. Measurements were carried out in the Genitron AlphaGUARD PQ2000 PRO Radon Detector System which measures with active measurement method. The radon concentration values of the faculty buildings are 4.48-82.00 Bqm-3; mean radon concentrations were determined in the range of 20.64-30.91 Bqm-3. The average radon concentration of all buildings was calculated as 24.79 Bqm-3. The annual effective dose equivalents of 6 faculty buildings were determined in the range of 0.16-0.24 mSvy-1, and the average annual effective dose equivalent was calculated as 0.20 mSvy-1. The results were compared with the limit values recommended b...

Acta Physica Polonica A, 2015

Neutron induced reaction cross sections for (n,2n) and (n,3n) have been calculated in the energy ... more Neutron induced reaction cross sections for (n,2n) and (n,3n) have been calculated in the energy range between 8 MeV and 26 MeV. Calculations were made for the target nuclei; 45 Sc, 59 Co, 89 Y, 93 Nb, 103 Rh, 169 Tm, 175 Lu, 181 Ta, 197 Au, 209 Bi. Calculated results were compared with the available data in EXFOR. Model calculations of present data indicated clearly that some reported data from measurements failed to separate (n,2n) and (n,3n) contributions.