Wszystkie pola: neutron activation analysis (NAA) - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of a neuro-fuzzy model for neutron activation analysis (NAA)Sb
Autorzy:: Khalafi, H.
Terman, M. S.
Rahmani, F.
Powiązania:: https://bibliotekanauki.pl/articles/147055.pdf
Data publikacji:: 2011
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: neural network
fuzzy logic
neutron activation analysis (NAA)
gamma-line energy
Opis:: Neutron activation analysis (NAA) is a precise chemical multielemental method of analysis which is satisfactorily used for qualitative and quantitative analyses. Repeated irradiation is needed because of mal-determination of some elements due to peak overlap in qualitative analysis. In this study, NAA procedure has been modified using a neuro-fuzzy model to avoid repeated irradiation based on multilayer perceptrons network trained by the Levenberg-Marquardt algorithm. This method increases the precision of spectrum analysis in the case of strong background and peak overlap.
Źródło:: Nukleonika; 2011, 56, 1; 17-21
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Trace analysis of Indonesian volcanic ash using thermal and epithermal neutron activation analysis
Autorzy:: Canion, B.
Jacques, C.
Landsberger, S.
Taftazani, A.
Powiązania:: https://bibliotekanauki.pl/articles/146890.pdf
Data publikacji:: 2012
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: neutron activation analysis (NAA)
trace elements
volcanic ash
rare earth elements (REE)
Mount Merapi
Opis:: There is continued great interest in determining the trace element and heavy metal content of volcanic ash for a variety of reasons. The motivation stems from the desire to understand the geochemistry of volcanic ash in imbedded geological formations, the impact on seawater, and the possible release of toxic elements into the environment that may impact livestock grazing and water systems. Ash from volcanic plumes can go as high 8-18 km thus affecting climate and air traffic. We have employed Compton suppression neutron activation analysis (NAA) with thermal and epithermal neutrons to determine trace elements in volcanic ash from Indonesian eruption of Mount Merapi in October 2010. We found a wide range of elements, including several rare earth elements.
Źródło:: Nukleonika; 2012, 57, 4; 585-589
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Instrumental neutron activation analysis (INAA) for steel analysis and certification
Autorzy:: Polkowska-Motrenko, H.
Chajduk, E.
Danko, B.
Powiązania:: https://bibliotekanauki.pl/articles/147648.pdf
Data publikacji:: 2011
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: steel analysis
neutron activation analysis (NAA)
proficiency testing/interlaboratory comparison (PT/ILC)
certification of steel reference materials
Opis:: Instrumental neutron activation analysis (INAA) procedure of elemental steel analysis has been elaborated. The reliability of results obtained by the described procedure has been proved in the frame of different proficiency testing/interlaboratory comparison (PT/ILC) programmes, in which the Institute of Nuclear Chemistry and Technology (INCT, Warsaw) took part since 2005. This work summarizes participation of INCT in these exercises and demonstrates the usefulness of INAA to the certification of steel reference materials.
Źródło:: Nukleonika; 2011, 56, 4; 311-315
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Zastosowanie neutronowej analizy aktywacyjnej NAA do identyfikacji materii pochodzenia kosmicznego na Ziemi
Application of Neutron Activation Analysis for identification of cosmic matter on Earth
Autorzy:: Tymiński, Zbigniew
Mysłek-Laurikainen, Bogumiła
Powiązania:: https://bibliotekanauki.pl/articles/1032679.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Meteorytowe
Tematy:: NAA
classification of meteorites
impact craters
meteorites
neutron activation analysis
neutrons
γ spectrometry
Opis:: Neutron activation analysis (NAA) is an analytical method based on the measurement of characteristic radiation from radionuclides formed by neutron irradiation of the material of interest. The most suitable source of neutrons for NAA is a research reactor. The neutron activation analysis has been found to be extremely useful in the determination of trace and minor elements in geological and extraordinary samples. The method is non-destructive, giving many advantages, which are described. Measured abundances of the elements in meteorites, from major constituents down to those appearing only in trace amounts, provide information important for the theories of the origin and history of the Solar System.
Źródło:: Acta Societatis Metheoriticae Polonorum; 2009, 1; 97-100
2080-5497
Pojawia się w:: Acta Societatis Metheoriticae Polonorum
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: An internal standard for Fast Neutron Activation Analysis spectra obtained by means of Plasma Focus devices
Autorzy:: Verri, G.
Tartari, A.
Rapezzi, L.
Mezzetti, F.
Gribkov, V. A.
Da Re, A.
Powiązania:: https://bibliotekanauki.pl/articles/147122.pdf
Data publikacji:: 2001
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: gold
inelastic scattering
lead
mineral resources
NAA
plasma focus
Opis:: The behaviour of Pb activation peaks, which appear in an X-ray spectrum of Fast Neutron Activation Analysis (FNAA) performed by means of a Plasma Focus (PF) neutron source and an NaI scintillator counter, has been studied. The PF device generates neutron bursts of different intensities. To know the exact neutron flux illuminating a sample during PF discharges an external neutron counter is usually used. The nature and behaviour of the indicated peaks suggest that one could use one of them as an internal standard for neutron production measurement instead of an external counter. This technique allows more reliable and accurate determinations of the presence of various elements.
Źródło:: Nukleonika; 2001, 46, suppl. 1; 103-105
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

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