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    Wyświetlanie 1-13 z 13
    Tytuł:
    Preliminary determination of angular distribution of neutrons emitted from PF-1000 facility by indium activation
    Autorzy:
    Jednoróg, S.
    Szydłowski, A.
    Scholz, M.
    Paduch, M.
    Bienkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146918.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    neutron activation technique
    plasma diagnostics
    Opis:
    This paper presents a new method applied to measure the angular neutron emission from Plasma Focus (PF) - type deuterium discharges performed within the PF-1000 facility. Neutrons were recorded by activation of especially optimized (mass and shape) indium samples with subsequent gamma spectrometry to measure the induced activity of the samples. The neutron fluence rate on every indium sample used was determined using neutron transport calculation and measured activity of the samples.
    Źródło:
    Nukleonika; 2012, 57, 4; 563-568
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silver nanoparticle accumulation by aquatic organisms – neutron activation as a tool for the environmental fate of nanoparticles tracing
    Autorzy:
    Asztemborska, M.
    Jakubiak, M.
    Książyk, M.
    Stęborowski, R.
    Polkowska-Motrenko, H.
    Bystrzejewska-Piotrowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/146436.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    silver
    nanoparticles
    neutron activation
    Chironomid larvae
    Danio rerio
    Opis:
    Water environments are noted as being some of the most exposed to the infl uence of toxic nanoparticles (NPs). Therefore, there is a growing need for the investigation of the accumulation and toxicity of NPs to aquatic organisms. In our studies neutron activation followed by gamma spectrometry and liquid scintillation counting were used for studying the accumulation of silver nanoparticles (AgNPs) by freshwater larvae of Chironomus and fi sh Danio rerio. The infl uence of exposition time, concentration and the source of nanoparticles on the effi ciency of AgNP accumulation were studied. It was found that AgNPs are effi ciently accumulated by Chironomid larvae for the fi rst 30 hours of exposition; then, the amount of silver nanoparticles decreases. The silver content in larvae increases together with the NP concentration in water. Larvae which have accumulated AgNPs can be a source of nanoparticles for fi sh and certainly higher levels of Ag in the trophic chain. In comparison with water contamination, silver nanoparticles are more effi ciently accumulated if fi sh are fed with AgNP-contaminated food. Finally, it was concluded that the applied study strategy, including neutron activation of nanoparticles, is very useful technique for tracing the uptake and accumulation of NPs in organisms.
    Źródło:
    Nukleonika; 2014, 59, 4; 169-173
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of neutron activation for investigation of Fe3O4 nanoparticles accumulation by plants
    Autorzy:
    Bystrzejewska-Piotrowska, G.
    Asztemborska, M
    Stęborowski, R.
    Polkowska-Motrenko, H.
    Danko, B.
    Ryniewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146840.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iron (II,III) oxide
    nanoparticles
    neutron activation
    plants
    Opis:
    As a result of the rapid development of nanotechnology and increasing application of nanoproducts in many areas of everyday life, there is a growing risk of production of nanowastes potentially dangerous for the environment. This makes it necessary to investigate the accumulation and toxicity of nanoparticles (NPs) at different trophic levels. In the studies neutron activation was applied for the investigation of iron (II,III) oxide nanoparticle (Fe3O4-NPs) accumulation by Lepidium sativum and Pisum sativum L. Plants were cultivated on growth medium contaminated with different concentrations (0.01-10 mmolźL-1) of Fe3O4-NPs. For the identification of the presence of Fe3O4-NPs in plant tissues gamma spectrometry following iron oxide (II,III) nanoparticles irradiation was applied. Both plant species were found to accumulate iron (II,III) oxide nanoparticles. The highest content of NPs was found in plant roots, reaching 40 g/kg for Pisum sativum L. More than 90% of accumulated NPs were found in roots. Accumulation of Fe3O4-NPs was found to depend on the concentration of nanostructures in the growth medium. The transfer factor for Lepidium sativum roots and shoots and Pisum sativum L. shoots decreased with increasing NP concentration in the medium; for Pisum sativum L. roots the tendency was reversed. Neutron activation of nanoparticles was shown to be a powerful tool for tracing the environmental fate of NPs and their uptake and accumulation in organisms.
    Źródło:
    Nukleonika; 2012, 57, 3; 427-430
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Study of organohalogens in foodstuffs and environmental samples by neutron activation analysis and related techniques
    Autorzy:
    Xu, D.
    Chai, Z.
    Zhang, H.
    Mao, X.
    Ouyang, H.
    Sun, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/147259.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    instrumental neutron activation analysis (INAA)
    pine needle
    foodstuff
    extractable organohalogen
    Opis:
    Pine needles and foodstuffs collected from Beijing, China, were analyzed by instrumental neutron activation analysis (INAA) combined with organic solvent extraction for total halogens, extractable organohalogens (EOX) and extractable persistent organohalogens (EPOX). The INAA detection limits are 50 ng, 8 ng and 3.5 ng for Cl, Br and I, respectively. The contents and distribution patterns of organohalogens in these samples are reported. EOCl accounted for 0.013 0.016% and 1.6 2.7% of the total chlorine in yogurt and apples, respectively, which suggested that chlorine in foodstuffs mainly existed as inorganic species and non-extractable organochlorines. EOCl contents in pine needles and foodstuffs were noticeably higher than those of EOBr and EOI. For pine needles, yogurt and apples, 1.6 34%, 23 58% and 29 35% of EOCl remained as extractable persistent organochlorine (EPOCl), respectively. Pine needle containing higher EOCl contents in chemical industrial and traffic hub areas indicated that chemical industries and exhaust emission from vehicle were the main sources of organochlorines in the Beijing's air. The relative proportions of the known organochlorines (such as HCHs, DDTs, chlordanes, heptachlor, HCB and PCBs) to the total EOCl and EPOCl were 0.04 1.6% and 0.7 21.5%, respectively, which implied that the identity of species of a major portion of the EOCl and EPOCl measured in pine needles was unknown.
    Źródło:
    Nukleonika; 2004, 49, 3; 101-106
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A contribution of INAA to the determination of the provenance of the fourteenth century sculpture
    Autorzy:
    Ligęza, M.
    Pańczyk, E.
    Rowińska, L.
    Waliś, L.
    Nalepa, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147539.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alabaster sculpture
    instrumental neutron activation analysis
    provenance study
    trace elements
    Opis:
    The object of the investigation is the so called Madonna Jackowa, or St. Hyacinthus's Madonna, a gothic alabaster figurine dated from the XIVth century. The purpose of the investigation is to provide an answer to the question whether Madonna Jackowa was made of native alabaster. Samples of alabaster from five various quarries located along the line Cracow-Lvov as well as in Lower Silesia were analyzed and the content of trace elements was compared with that of the sculpture. The determination of trace elements was carried out by means of the instrumental neutron activation analysis.
    Źródło:
    Nukleonika; 2001, 46, 2; 71-74
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Tytuł:
    Critical comparison of INAA and ICP-MS applied in the characterization of purity of TRISO fuel and substrates to its production
    Autorzy:
    Chajduk, Ewelina
    Kalbarczyk, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2055667.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    chemical purity
    inductively coupled plasma mass spectrometry
    instrumental neutron activation analysis
    TRISO coated fue
    Opis:
    The application of inductively coupled plasma mass spectrometry (ICP-MS), both in solution and laser ablation (LA) mode, and instrumental neutron activation analysis (INAA) in the nuclear material analysis are presented in this paper. The possibility of each technique for the chemical characterization of substances used during TRISO fuel production and its advantages and limitations are discussed based on the obtained results of the analysis of real materials used in TRISO fuel production in the Institute of Nuclear Chemistry and Technology. The paper also reports the application of INAA and LA-ICP-MS to the verifi cation of the purity of the protective layers of pyrolytic carbon (PyC) and silicon carbide.
    Źródło:
    Nukleonika; 2021, 66, 4; 121--126
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    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
    Tytuł:
    Fast Neutron Activation Analysis of gold by inelastic scattering, 197Au(n,ngamma)197Aum, by means of Plasma Focus device
    Autorzy:
    Verri, G.
    Mezzetti, F.
    Da Re, A.
    Rapezzi, L.
    Gribkov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/146754.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    activation
    gold
    neutron
    plasma focus
    Opis:
    The application of a Fast Neutron Activation Analysis (FNAA) technique on samples of pure gold, irradiated by a plasma focus of 7 kJ, has been investigated. The reaction was the inelastic scattering of neutrons, 197Au(n,n'gamma)197Aum. To avoid problems connected with peculiar features of the neutron emission from this kind of source, a preliminary standardisation of the method has been carried out. The results obtained have a practical interest in view of possible applications to the technology of extraction of minerals.
    Źródło:
    Nukleonika; 2000, 45, 3; 189-191
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the emission rate for the 14 MeV neutron generator with the use of radio-yttrium
    Autorzy:
    Laszynska, E.
    Jednorog, S.
    Ziolkowski, A.
    Gierlik, M.
    Rzadkiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146115.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    14 MeV neutron generator
    activation method
    yttrium activation
    Opis:
    The neutron emission rate is a crucial parameter for most of the radiation sources that emit neutrons. In the case of large fusion devices the determination of this parameter is necessary for a proper assessment of the power release and the prediction for the neutron budget. The 14 MeV neutron generator will be used for calibration of neutron diagnostics at JET and ITER facilities. The stability of the neutron generator working parameters like emission and angular homogeneity affects the accuracy of calibration other neutron diagnostics. The aim of our experiment was to confi rm the usefulness of yttrium activation method for monitoring of the neutron generator SODERN Model: GENIE 16. The reaction rate induced by neutrons inside the yttrium sample was indirectly measured by activation of the yttrium sample, and then by means of the γ-spectrometry method. The pre-calibrated HPGe detector was used to determine the yttrium radioactivity. The emissivity of neutron generator calculated on the basis of the measured radioactivity was compared with the value resulting from its electrical settings, and both of these values were found to be consistent. This allowed for a positive verifi cation of the reaction cross section that was used to determine the reaction rate (6.45 × 10–21 reactions per second) and the neutron emission rate (1.04 × 108 n·s–1). Our study confi rms usefulness of the yttrium activation method for monitoring of the neutron generator.
    Źródło:
    Nukleonika; 2015, 60, 2; 319-322
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new concept of fusion neutron monitoring for PF-1000 device
    Autorzy:
    Jednorog, S.
    Laszynska, E.
    Bienkowska, B.
    Ziolkowski, A.
    Paduch, M.
    Szewczak, K.
    Mikszuta, K.
    Malinowski, K.
    Bajdel, M.
    Potrykus, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148394.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    PF-1000
    neutron diagnostic
    activation technique
    Opis:
    The power output of plasma experiments and fusion reactors is a crucial parameter. It is determined by neutron yields that are proportional and directly related to the fusion yield. The number of emitted neutrons should be known for safety reasons and for neutron budget management. The PF-1000 is the large plasma facility based on the plasma focus phenomenon. PF-1000 is operating in the Institute of Plasma Physics and Laser Microfusion in Warsaw. Neutron yield changes during subsequent pulses, which is immanent part of this type device and so it must be monitored in terms of neutron emission. The reference diagnostic intended for this purpose is the silver activation counter (SAC) used for many years. Our previous studies demonstrated the applicability of radio-yttrium for neutron yield measurements during the deuterium campaign on the PF-1000 facility. The obtained results were compared with data from silver activation counter and shown linear dependence but with some protuberances in local scale. Correlation between results for both neutron monitors was maintained. But the yttrium monitor registered the fast energy neutron that reached measurement apparatus directly from the plasma pinch. Based on the preliminary experiences, the yttrium monitor was designed to automatically register neutron-induced yttrium activity. The MCNP geometrical model of PF-1000 and yttrium monitor were both used for calculation of the activation coefficient for yttrium. The yttrium monitor has been established as the permanent diagnostic for monitoring fusion reactions in the PF-1000 device.
    Źródło:
    Nukleonika; 2017, 62, 1; 17-22
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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