Temat: 29.90.+r - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Shielding of Gamma Radiation by Using Porous Materials
Autorzy:: Gedik, S.
Baytaş, A.
Powiązania:: https://bibliotekanauki.pl/articles/1401959.pdf
Data publikacji:: 2015-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 29.90.+r
Opis:: In this study, the gamma radiation attenuation was investigated for different composite metallic foams, soil and standard sand samples. Gamma transmission technique with narrow beam geometry, Co-60 radiation source were used in experimental studies. The measurements were used to calculate the linear attenuation coefficients and porosities of these materials. The results were compared according to radiation attenuation and porosity distribution of porous media. The metallic foams had large and non-homogeneous porosity values, therefore sand and soil showed better radiation attenuation property. However, the saturated silica foam had large ability of gamma ray attenuation as well as dry soil.
Źródło:: Acta Physica Polonica A; 2015, 128, 2B; B-174-B-175
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Determination of natural radioactivity concentrations in surface soils in the Yeşilırmak river in Amasya, Turkey
Autorzy:: Çetin, B.
Powiązania:: https://bibliotekanauki.pl/articles/1065705.pdf
Data publikacji:: 2016-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 29.90.+r
29.30.-h
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2016, 130, 1; 320-321
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Radioactivity investigation of sediment samples from Beni Haroun Dam using high-resolution gamma-ray spectroscopy
Autorzy:: Bouhila, G.
Benrachi, F.
Powiązania:: https://bibliotekanauki.pl/articles/1050951.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 29.90.+r
29.30.-h
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 889-891
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Assessments of natural radioactivity concentration and radiological hazard indices in surface soils from the Gözlek Thermal SPA (Amasya-Turkey)
Autorzy:: Bolat, B.
Öner, F.
Çetın, B.
Powiązania:: https://bibliotekanauki.pl/articles/1054952.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 29.90.+r
29.30.-h
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 1200-1202
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Evaluation of Positron Implantation Profiles in Various Materials for ²²Na Source
Autorzy:: Dubov, L.
Akmalova, Yu.
Stepanov, S.
Shtotsky, Yu.
Powiązania:: https://bibliotekanauki.pl/articles/1030040.pdf
Data publikacji:: 2017-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 02.70.Uu
29.90.+r
Opis:: Positron implantation profiles in various materials for ²²Na isotope source are discussed. The spatial distribution of positrons in materials with densities from 1 to 21 g/cm³ are simulated using GEANT4 code. The results indicate that depth distributions of thermalized positrons in any homogeneous medium can be described by the sum of two exponential functions. Contribution of the short-range exponent is about 11% in the materials. The both absorption coefficients can be well represented as a function of material density and atomic number. Proposed empirical model agrees well with available experimental data.
Źródło:: Acta Physica Polonica A; 2017, 132, 5; 1482-1485
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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