Temat: neutron activation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Large Sample Neutron Activation Analysis: correction for neutron and gamma attenuation
Autorzy:: Tzika, F.
Stamatelatos, I.
Kalef-Ezra, J.
Bode, P.
Powiązania:: https://bibliotekanauki.pl/articles/147265.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: neutron activation analysis
neutron self-shielding
gamma-ray attenuation
MCNP code
Opis:: A Large Sample Neutron Activation Analysis (LSNAA) facility is under development at the GRR-1 research reactor, NCSR "Demokritos". The LSNAA facility design incorporates sample irradiation in the reactor graphite thermal neutron column and subsequent measurement of the activity induced in a gamma spectroscopy system with gamma ray transmission measurement options included. The Monte Carlo neutron and photon transport code MCNP-4C was used to model the facility. Appropriate correction factors accounting for neutron field perturbation during sample irradiation and high-purity germanium detector efficiency for the volume source were derived. The results of the computations were experimentally verified by measurements for a set of known materials. The LSNAA facility will be used to perform multi-element, non-destructive, contamination-free analysis of large volume samples with high sensitivity and excellent sampling. End-users of the facility will be archaeological, environmental, bio-medical research laboratories and industry.
Źródło:: Nukleonika; 2004, 49, 3; 115-121
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A study on chemical composition of Baszkówka and Mt. Tazerzait chondrites
Autorzy:: Dybczyński, R.
Chwastowska, J.
Danko, B.
Kulisa, K.
Polkowska-Motrenko, H.
Samczyński, Z.
Sterlińska, E.
Szopa, Z.
Powiązania:: https://bibliotekanauki.pl/articles/2059297.pdf
Data publikacji:: 2001
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Baszkówka
Tazerzait Mountains
meteorites
chondrites
neutron activation analysis
speciation
cosmochemistry
Opis:: The elemental contents of two new meteorites, Baszkówka (Poland, 1994) and Mt.Tazerzait (Niger, 1991), were studied by instrumental and radiochemical neutron activation analysis (NAA), supplemented in the case of some elements by gravimetric, titrimetric, spectrophotometric and atomic absorption spectrometric measurements. In total 28 elements were determined for each meteorite. A striking similarity in the bulk chemical composition of the two meteorites was observed. In the case of Baszkówka some study of the elemental contents of the magnetic fraction and the distribution of elements between kamacite and taenite phases was also made. This study confirms that Baszkówka and Mt. Tazerzait are generally more similar to L chondrites than to any other class of chondrites. However both meteorites show also some distinctive features (e.g very low Hg content), distinguishing them from all other L chondrites known. Both meteorites may derive from a common parent body, which may be different from that typical for other chondrites.
Źródło:: Geological Quarterly; 2001, 45, 3; 289-302
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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