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    Wyświetlanie 1-4 z 4
    Tytuł:
    Plutonium and gamma emitters in the northeastern part of Bory Tucholskie (Poland)
    Autorzy:
    Mietelski, J. W.
    Mirocha, S.
    Bogacz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146823.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radioactive contamination
    plutonium
    137Cs
    global fallout
    Chernobyl
    Bory Tucholskie
    Opis:
    The paper presents results of the measurements of Pu and gamma emitters of some forest litter/soil profiles collected in 1999 in the northeastern part of Bory Tucholskie forest (northern Poland). Besides the activity concentration of 137Cs, 134Cs, 40K, 228Ac, 238Pu, 239+240Pu, the cumulated deposition of 137Cs, 238Pu and 239+240Pu were calculated. The origin of these radionuclides is discussed on the basis of the observed activity ratios. The observed average level of radioactive contamination confirms expectations for this region, however samples show a relatively large variation of cumulated deposition for both plutonium and radiocesium originated from global and Chernobyl fallout.
    Źródło:
    Nukleonika; 2008, 53, 1; 17-25
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Whole-Body Spectrometer (WBS) at the Institute of Nuclear Physics, Kraków : design and results for Polish citizens visiting Japan during the Fukushima accident
    Autorzy:
    Mietelski, J. W.
    Janowski, P.
    Kierepko, R.
    Hajduk, R.
    Bogacz, J.
    Jurkowski, J.
    Ochab, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/146614.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    whole-body spectrometry (WBS)
    Fukushima
    body burden
    gamma spectrometry
    doses
    Opis:
    The first Polish whole-body spectrometer (WBS) with scintillation detectors was constructed in Łódź in the early sixties of the last century and was operating there for more than 30 years. In 2008, the 19th century steel shield of this instrument was transported from Łódź to Kraków, where it was re-equipped with a modern gamma spectrometric system. Design and construction of this modernized spectrometer is presented along with the results for in-body contamination measurements of four Polish inhabitants who returned to Poland from Japan after the Fukushima accident compared with the results for typical Polish inhabitants, the volunteers from the Institute of Nuclear Physics (IFJ, Kraków) workers. Although, a clear signal from the Fukushima fallout was noticed for three of four persons who returned from Japan, the calculated doses were negligible. No traces of Fukushima-originating radionuclides were noticed for the examined people who have not traveled to Japan.
    Źródło:
    Nukleonika; 2013, 58, 4; 519-525
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Search for canted spin arrangement in Er2-xTbxFe14B with Mössbauer spectroscopy
    Autorzy:
    Kurzydło, P. M.
    Bogacz, B. F.
    Pędziwiatr, A. T.
    Oleszak, D.
    Przewoźnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147036.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer effect
    permanent magnet materials
    spin diagrams
    spin reorientation
    Opis:
    The materials studied were polycrystalline compounds Er2-xTbxFe14B (x = 0.1, 0.2, 0.3, 0.4) which crystallize in a tetragonal lattice and display a variety of spin arrangements. The compounds have been measured with 57Fe Mössbauer spectroscopy over the temperature range 80–320 K in order to investigate the spin reorientation processes. Each compound was studied in a wide temperature range, with precise Mössbauer scanning in the vicinity of the transition. The set of spectra obtained for a given compound was analyzed using simultaneous fi tting procedure to investigate the infl uence of the transition on the shape of the spectra. The fi tting program was specifi ed to analyze the transition according to the ‘two state model’: spins fl ip abruptly from initial angle to fi nal arrangement (90° angle). Obtained results suggest that spin reorientation process cannot be described using only the mentioned above model. Additional computer simulations based on the Yamada–Kato model were conducted to determine temperature range and the type of spin alignments in the vicinity of the transition. These theoretical results supported by spectra analysis suggest the existence of intermediate (canted) spin arrangements in the studied compounds. The spin arrangement diagram was constructed.
    Źródło:
    Nukleonika; 2015, 60, 1; 93-96
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin reorientation process in Tm2–xHoxFe14B : analysis of conical arrangement based on Mössbauer spectra
    Autorzy:
    Kurzydło, P. M.
    Pędziwiatr, A. T.
    Bogacz, B. F.
    Przewoźnik, J.
    Oleszak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148120.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    permanent magnetic materials
    Mössbauer effect
    spin reorientation
    spin diagrams
    Opis:
    The spin reorientation process in the Tm2–xHoxFe14B series of compounds was studied using 57Fe Mössbauer spectroscopy over the temperature range 5.2–320 K with a focus on the analysis of conical spin arrangement. Each compound was studied by precise Mössbauer scanning in the vicinity of the transition and during the transition. By applying computer simulations based on the simplified Yamada-Kato model, as well as on some literature data for R2Fe14B (R = Tm, Ho) compounds, the above series was selected for studies as it contains compounds with different spin arrangements (axial, planar, conical). It was a crucial requirement for obtaining unambiguous angular dependences when applying a simultaneous fitting procedure of Mössbauer spectra. Such an extended procedure was applied which allowed the temperature dependence of the angle describing the position of the magnetization vector to be obtained. The results were compared with those from theoretical simulations. The spin arrangement diagram was constructed. A conical spin arrangement was confirmed over a wide temperature range.
    Źródło:
    Nukleonika; 2017, 62, 2; 123-127
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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