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1
Content available remote

Radioactivity Investigation of Sediment Samples from Beni Haroun Dam Using High-Resolution Gamma-Ray Spectroscopy

100%
Bouhila G., Benrachi F.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
889-891
EN
In this study, the levels of natural and anthropogenic radioactivity in the sediment samples, collected from Beni Haroun Dam, were investigated using gamma-ray spectrometry. The results obtained for the ²³⁸U, ²³²Th series, ⁴⁰K natural element and ¹³⁷Cs anthropogenic radionuclide are discussed. To evaluate the radiological hazard of radioactivity in samples, the absorbed dose rate, the annual effective dose, the radium equivalent activity Ra_{eq}, the external and internal hazard indices H_{ex} and H_{in} were calculated and presented in comparison with the data collected from different areas in the world.
2
Content available remote

Determination of Natural Radioactivity from ^{232}Th with Gamma-Ray Spectrometer in Dereköy-Yazır (Southwestern Anatolia)

100%
Uyanik N., Öncü Z., Uyanik O., Akkurt İ.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2B
B-441-B-442
EN
This study presents new data on the baseline concentrations of Thorium over the Dereköy-Yazır (Ağlasun-Burdur) volcanic area. Portable gamma-ray spectrometer was used for natural thorium mapping. In situ measurements were made in the field, in the area of 7.5 km² at 165 points. Variations in the Th concentration in the surficial environment of the Dereköy-Yazır region appear to be related to bedrock lithology. The measured thorium concentration varies between 0.68-36 ppm, in the studied area. The highest concentration values were obtained from volcanic rocks. The outcropping volcanic rocks in the region are Pliocene alkaline basalts.
3
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Distribution of Natural Radioactivity from ^{40}K Radioelement in Volcanics of Sandıklı-Şuhut (Afyon) Area

100%
Uyanik N., Öncü Z., Uyanik O., Bozcu M., Akkurt İ., Günoğlu K., Yağmurlu F.
Acta Physica Polonica A
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2015
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vol. 128
|
issue 2B
B-438-B-440
EN
Many radioactive elements have existed when the Earth had appeared and the long living of them are still present. One of the most important of these radioactive elements is ^{40}K. It makes about 0.012% of total content of K, widely represented in many different rocks. In this study the distribution of the natural ^{40}K radioelement in the volcanics of the south part of Afyon was investigated. Gamma-ray spectrometer was used for in-situ measurements of this radioelement concentration. Studied area has covered approximately 1800 km². In-situ measurements were performed at 1390 different locations in this field. Data for each measurement was gathered during 3 min. The map of the ^{40}K element distribution in the studied area was produced. The high values of ^{40}K, according to this map, were obtained in the areas of the alteration zones, between Sandıklı and Şuhut in the studied area.
4
Content available remote

Assessments of Natural Radioactivity Concentration and Radiological Hazard Indices in Surface Soils from the Gözlek Thermal SPA (Amasya-Turkey)

100%
Bolat B., Öner F., Çetın B.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
1200-1202
EN
The concentration of natural radioactivity was determined in the surface soil of the Gözlek Thermal SPA in Amasya. The activity concentrations of natural radionuclides in soil samples were determined using gamma-ray spectrometer, containing a 3"× 3" NaI(Tl) detector connected to multi-channel-analyser. The photo-peaks at 1460, 1764 and 2615 keV are due to ⁴⁰K, ²²⁶Ra and ²³²Th, respectively. The radiological hazard indices of the natural radionuclides content, radium equivalent activities Ra_{eq}, absorbed dose rate (ADR), annual effective dose rate (AEDR) and external hazard index H_{ex} were also calculated.
5
Content available remote

Determination of Natural Radioactivity Concentrations in Surface Soils in the Yeşilırmak River in Amasya, Turkey

100%
Çetin B.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
320-321
EN
In this study, natural radioactivity concentration in the surface soils along the Yeşilırmak river in Amasya have been investigated. The activity concentrations of radionuclides of the ²²⁶Ra and ²³²Th decay chains and of the ⁴⁰K were determined by means of gamma-ray spectrometry measurements made using a 3 × 3'' NaI(Tl) detector system. Concerning radiological risk, the absorbed gamma dose in air from those soils and the outdoor annual effective dose equivalent were calculated.
6
Content available remote

Assessment of Environmental Risk from Coal Using Neutron Activation Analysis

80%
Ileri R., Hacıyakupoğlu S., Esen A., Oruçığlu E., Erentürk S.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1010-1012
EN
This study aimed to determine element concentration in coal samples and to assess Co, Cr, Se, Th and U leaching from coals exposed to a simulated coal cleaning process. Coal samples taken from a local area of Turkey were grounded and exposed to water for one month period. Then the cleaned samples were filtered and dried. The elemental concentrations in the samples before and after the cleaning procedure were determined by relative neutron activation analysis (NAA). Raw and water cleaned coal samples were irradiated in central irradiation tube of TRIGA MARK II Research Reactor at 250 kW for 6 h and measured for their activities by using high resolution gamma spectroscopy system. The results showed that leaching percentage for Se is up to 100% and for Co, Cr, Th and U up to 71%, 17%, 30%, 28% respectively.
7
Content available remote

Nuclear Data Evaluation for ²¹⁷Th

80%
Nafee S., Al-Ramady A., Shaheen S.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
669-672
EN
Thorium-217 was produced by the reaction ¹⁷⁰Er (⁵⁰Ti, xn) ^{220-x}Th. The nuclei were studied by Evaporation Residues gamma-alpha-gamma coincidence measurements (ER-γ-α-γ). The evaluated decay data for the ²¹⁷Th nuclide resulted from the above interaction is presented in this report. Three delayed γ-transitions (309, 673 and 1269 keV) have been measured from the ER-γ(-γ)-α correlations and γ-γ coincidences. They were assigned to ²¹⁷Th, based on the level systematics of the N=127 isotones. The evaluated half-lives T_{1/2} for these levels were assigned to be 64-₂₂⁺⁶⁴, 69-₁₇⁺³² and 66-₁₅⁺²⁷ μs, respectively. In addition, an isomeric state (2252+x) keV is presented in the ²¹⁷Th decay scheme between the 2252 (21/2+) and 2362 (25/2+) keV. Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell conversion electron ratios have been calculated using BrIcc code v2.3.
8
Content available remote

Mössbauer Spectroscopy Study of Laboratory Produced ODS Steels

70%
Degmová J., Dekan J., Šimeg Veterníková J., Slugeň V.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1171-1173
EN
The investigated oxide dispersion strengthened steels were received from laboratories involved in the Coordinated Research Project F11014 "Benchmarking of Structural Materials Pre-selected for Advanced Nuclear Reactors", namely from India (IGCAR), Russia (Bochvar Institute), China (University of Beijing), and Japan (Kyoto University). The application of the Mössbauer spectroscopy on these materials is aimed to reveal the complex information about studied materials via unique characteristics as micromagnetic properties and homogeneity of admixtures distribution in steels. All studied steels mainly differ in content of elements as Cr or Al. Chosen fitting model consists of bcc Fe, bcc Fe with Cr substitution and paramagnetic bcc Cr rich components. These ODS steels are aimed in further study for He implantations.
9
Content available remote

Characterization of ODS Steels after Gamma Irradiation for Application in ALLEGRO Reactor

70%
Slugeň V., Bartošová I., Dekan J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1090-1092
EN
Oxide-dispersion strengthened steels characterization using various spectroscopic techniques is presented. Microstructure of 15% chromium oxide-dispersion strengthened steels was studied in term of vacancy defects presence and their accumulation after defined irradiation treatment, respectively. Studied materials originated from Kyoto University and studied via IAEA collaborative project focused on generation IV reactors (ALLEGRO). Samples were characterized "as received" by positron annihilation lifetime spectroscopy, the Mössbauer spectroscopy and their microstructure was examined by transmission electron microscopy as well. Samples were afterwards irradiated in Washington State University Nuclear Radiation Center via a strong gamma source (6 TBq). Damage induced by gamma irradiation was evaluated by positron lifetime measurements in emphasis on defect accumulation in the materials. We have demonstrated strong defect production induced by gamma irradiation which results from positron measurement data.
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