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Wyświetlanie 1-15 z 46
Tytuł:
Mosgraf - 2009 : the Mössbauer data processing suite of applications
Autorzy:
Duraj, Ł.
Ruebenbauer, K.
Powiązania:
https://bibliotekanauki.pl/articles/147404.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectroscopy
energy domain
processing of data
Opis:
This contribution gives general description of the Mössbauer data processing suite of applications Mosgraf- 2009. The suite is designed to process data obtained in the energy domain. It contains many applications to generate off-line functionality files of the spectrometers and many applications to pre-process data or to plot results of the calculations. The suite is designed for the Microsoft Windows registery mark systems and it is compatible with the MsAa-x spectrometers of the RENON family. It could be installed on the same computer as the spectrometer drivers provided a broadband Ethernet link is available for the computer in question. Applications are provided to accept data from other spectrometers as well. The suite contains a large collection of the applications to simulate or fit experimental data.
Źródło:
Nukleonika; 2013, 58, 1; 13-16
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variation of radon in the Bozkov cave
Autorzy:
Rovenska, K.
Thinova, L.
Powiązania:
https://bibliotekanauki.pl/articles/148713.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radon
cave
long-term measurement
data
analysis
Opis:
Measurement of the radon concentration has been performed in the Bozkov dolomite cave since 2002. Radon concentration was obtained by two means: continuous measurement by a Radim3 monitor at 30 min intervals and a 6 month average by LR115 solid-state nuclear track detector (SSNTD) in a diffusion chamber placed at 8 points along the cave tour path. The radon concentration shows diurnal, seasonal, and yearly variations. The concentration maximum in the cave, in contrast to the dwellings, occurs in the summer time and equals to thousands of Bq/m3. At the same time, high variability of radon concentration occurs. Statistical analysis of a long time series of radon concentration was performed and the meteorological data were taken into account. The annual effective dose from radon for the cave guide (2006 y, working time spent in the cave 414 h) was 3.05 mSv. The dose was calculated using the mean value of radon concentration obtained by SSNTD as written above.
Źródło:
Nukleonika; 2010, 55, 4; 483-489
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of X-ray fluorescence method for elemental analysis of PM2.5 fraction
Autorzy:
Samek, L.
Furman, L.
Kawik, T.
Welnogorska, K.
Powiązania:
https://bibliotekanauki.pl/articles/971541.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
air pollution
energy dispersive X-ray fluorescence (EDXRF)
elemental analysis
particulate matter
Opis:
The scientific interest in air pollution comes from its influence on human health, the condition of cultural heritage and climate. The PM2.5 fraction (particles of a diameter of 2.5 mm or below), indirectly, has a significant impact on health which is associated with respiratory tract and blood vessel related diseases. However, not only the size, but also the content of the particles has a significant meaning. To determine the particulate matter contents, elemental analysis can be performed using numerous techniques, the most important of which is X-ray fluorescence. In this study, samples of PM2.5 fraction collected in Krakow, Poland were analyzed. The X-ray fluorescence method was used to perform elemental analysis. The gravimetric method was applied to determine the concentration of the PM2.5 fraction. Low detection limits of individual elements and precision of the X-ray fluorescence method were determined. The concentrations of the following elements: Cl, K, Ca, Cr, Mn, Fe, Cu, Zn, Br, Rb, Sr and Pb in the PM2.5 fraction samples collected in Krakow were evaluated. The homogeneity of the samples was also estimated. The concentrations of PM2.5 fraction collected in the summer of 2013 were in the range of 6–23 ng/m3. The concentrations of PM2.5 fraction collected in the winter of 2013 were in the range of 26–171 ng/m3. The precision of the method was found to be below 1% for elements with high concentration in the sample and 6–8 % for trace elements.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 621-626
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The cancer risk among workers of the nuclear centre at Świerk, Poland
Autorzy:
Fornalski, K.W.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/148146.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nuclear workers
low doses
radiation influence
Świerk
Polska
Opis:
Dosimetric information concerning 4606 workers at the nuclear centre at Świerk (Poland) from 1956 to 2001 and medical records of 575 workers are reviewed. The average cumulative doses per person were 34 mSv (effective dose) and 18 mSv (equivalent dose to hands). The calculated odds ratio of cancers, OR = 0.90 (0.62–1.18; 68% CI), shows a statistically insignificant decrease of the cancer risk among the irradiated workers. No cancer cases were detected neither among 52 people exposed to the highest cumulative doses (from 35 to 653 mSv) nor among 43 workers who had been chronically irradiated for a long time (from 13 to 26 years).
Źródło:
Nukleonika; 2013, 58, 4; 537-542
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The maximum entropy method in the analysis of the Mössbauer spectra
Autorzy:
Dobrzyński, L.
Szymański, K.
Satuła, D.
Powiązania:
https://bibliotekanauki.pl/articles/147136.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Bayesian logic
maximum entropy method
Mössbauer spectra
Opis:
The paper shows the possibility of reconstruction of the distribution of hyperfine field parameters without prior assumptions concerning correlations between parameters. The method used is the maximum entropy method and the distributions considered concern the magnetic field and isomer shift. The results obtained are very encouraging and show the feasibility of the proposed method.
Źródło:
Nukleonika; 2004, 49,suppl.3; 89-93
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time of soil water thermodynamic equilibrium during retention curve establishment using gamma-ray beam attenuation
Autorzy:
Pires, L.
Bacchi, O.
Reichardt, K.
Powiązania:
https://bibliotekanauki.pl/articles/148674.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gamma-ray attenuation
time of equilibrium
pressure chamber
soil water retention curve
Opis:
The soil water retention curve (SWRC) represents a fundamental part of the characterization of the soil hydraulic properties. The establishment of SWRC is usually time-consuming and presents several problems such as the difficulty of a correct judgment of the time of equilibrium. This work presents a new methodology that involves gammaray beam attenuation technique associated with the traditional pressure chambers, having as objective the more precise judgment of the time to attain equilibrium. The gamma-ray source used has an activity of 3.7 GBq consisting of 241Am, with peak energy of 59.54 keV. For the determination of retention curves using the gamma-ray attenuation technique, an acrylic pressure chamber was projected and constructed to be positioned between the source and detector with the gamma-ray beam crossing the center of the chamber and the soil sample during water extraction. The proposed technique allowed, through a specifically elaborated software for data acquisition, to evaluate with precision the exact instant of the equilibrium and, consequently, to obtain the right moment to change the chamber pressure to a new desired level, leading to a reduction of the time required for the whole retention curve determination. The results obtained show that the gamma-ray attenuation technique can be very useful as an auxiliary tool to evaluate SWRC, utilizing the Richards chamber.
Źródło:
Nukleonika; 2005, 50, 4; 173-177
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First results of measurement of equilibrium factors F and unattached fractions fp of radon progeny in Czech dwellings
Autorzy:
Jílek, K.
Thomas, J.
Tomášek, L.
Powiązania:
https://bibliotekanauki.pl/articles/148749.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
unattached fraction
dose
indoor aerosol concentration
rural/urban area
day/night
Opis:
The unattached fraction of radon decay product clusters fp and equilibrium factor F are dose relevant parameters in all dosimetric approaches to dose calculation. In the past, three year continuous weekly measurements of unattached and attached activity of radon daughter product and air exchange rate were carried out during heating season in 30 occupied typical Czech family houses. The results indicated significantly different weekly averages of equilibrium factor F and fp for houses located in towns compared those in villages. Due to this fact, approximately a 10 per cent average increase of equivalent lung dose rate was estimated in the detriment in towns. Average values of equilibrium factor F and fp were 0.40 and 8.6 per cent in urban houses and 0.32 and 10.7 per cent, respectively in rural houses. Based on the measurements of mean values of fp, average effective dose conversion factors (DFC) in units of mSv per working level month (WLM) were estimated to be 15.0 mSv/WLM in urban houses and 15.9 mSv/WLM in rural houses, respectively.
Źródło:
Nukleonika; 2010, 55, 4; 439-444
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic texture determination by CEMS with polarized radiation
Autorzy:
Olszewski, K.
Szymański, K.
Satuła, D.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/148215.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
magnetic texture
CEMS
polarized radiation
Opis:
CEMS measurements of a 57Fe foil were performed with unpolarized and polarized radiation. It is shown that the experimental results permit determination of important characteristics of a magnetic texture, an average square of the cosine((gamma-m)2) and an average cosine (gamma-m).
Źródło:
Nukleonika; 2007, 52, supl. 1; 17-19
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can thermal model explain (anti)lambda/(anti)p puzzle?
Autorzy:
Bravina, L.
Tywoniuk, K.
Zabrodin, E.
Powiązania:
https://bibliotekanauki.pl/articles/148580.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ultrarelativistic heavy-ion collisions
statistical model of hadron gas
two-source model (TSM)
Opis:
The abnormally high antilambda-to-antiproton ratio, which is close to 3.6 for central Au+Au collisions at 11.7 AGeV/c, was reported by the E917 Collaboration. Conventional thermal models and microscopic transport models generally predict that the ratio should be below unity. We show that this large value of the ratio can be reproduced within a two-source statistical model of an ideal hadron gas, which employs non-uniform distribution of net baryon charge and net strangeness within the reaction volume. The two sources are assumed to reach the chemical and thermal equilibrium separately and may have different temperatures, strangeness densities, etc. Other hadron yields and ratios measured for the reaction are reproduced quite well.
Źródło:
Nukleonika; 2006, 51,suppl.3; 7-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental and radon measurements in the underground workplaces in the Czech Republic
Autorzy:
Thinova, L.
Rovenska, K.
Otahal, P.
Powiązania:
https://bibliotekanauki.pl/articles/148693.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
underground workplaces
radon
effective dose
spectrometric analysis
Opis:
Most of radon and other environmental measurements were carried out in connection with research focused on improvement of radon dose assessment in the underground workplaces in the Czech Republic. The following methods are very useful for the detection of radon sources: air flow measurement; continual and short volume activity of radon and its progeny measurement; volume activity of thoron measurement; mapping of radon level in all workplace areas including horizontal and vertical gradient; radon in water measurement; integral radon monitor RAMARN testing, etc. In conjunction with equilibrium radon concentration (ERC) monitoring studies were conducted of radiogenic characteristics of caves clastogene and carbonate sediments, and other rock formations present in the Czech Massif and Western Carpathian. Over 150 samples of cave sediments were collected, in which the mass activities of present radionuclides were determined. Spectrometric analysis of the sediments enabled monitoring of disturbance in secular radioactive equilibrium in the given geochemical systems, through evaluation of 238U/226Ra or 228Th/224Ra proportion. Ratio of 208Tl/226Ra was monitored for the rock groups from the origin point of view assessment. Typical values for such ratio for carbonate rocks (including amphibolite and erlan) varied between 0.2–0.5, while for clastogene sediments and crystalline limestone the typical values were in the range 1.4–1.6. Conclusions from measurements were implemented in the new methodology for radon dose assessment.
Źródło:
Nukleonika; 2010, 55, 4; 491-493
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of the Fe1-xNix Invar alloys by monochromatic circularly polarized source
Autorzy:
Satuła, D.
Szymański, K.
Dobrzyński, L.
Rećko, K.
Waliszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/148805.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Invar alloys
Mössbauer polarimetry
transition metal alloys
Opis:
X-ray diffraction measurements and Mössbauer spectroscopy with and without external magnetic field parallel to beam direction have been performed for Fe1-xNix (x = 0.25, 0.30, 0.35) alloys. The compositions of the studied alloys were chosen in order to cover the concentration range where the fcc - bcc structural transformation appears, as well as where single phase fcc Fe-Ni alloys exhibit the Invar phenomena. Spatial distribution of the iron magnetic moments is discussed. The hyperfine magnetic field (h.m.f.) distribution is analyzed within a scope of two models discussed in the literature. In the first model it is assumed that any hyperfine magnetic filed vector have the same spatial distribution (the same values of (). In the second, the low field component of the hyperfine magnetic field is ordered antiferomagnetically (or disordered) while the high field component is aligned by an external magnetic field. In order to determine the mean values of cosine of the angle between teta-rays direction and hyperfine field vector of iron, (), a monochromatic circularly polarized Mössbauer source (MCPMS) was used. The analysis of the MCPMS results show that the shapes of the measured spectra can be explained by single values of .
Źródło:
Nukleonika; 2003, 48,suppl.1; 71-74
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine fields in UFe5Sn compound
Autorzy:
Satuła, D.
Szymański, K.
Tran, V.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/148320.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer studies
uranium intermetallic
magnetic intermetallic
Opis:
Local hyperfine interactions on Fe nuclei in UFe5Sn compound were determined in Mössbauer experiment. The analysis of the Mössbauer spectra measured at room temperature reveals the presence of two doublets only. Absorption line width indicates that neither distribution of quadrupole splitting nor isomer shift exists in the alloy. The measurements at 13 K show the presence of four magnetic components. Because the magnetic dipole and electric quadrupole interactions are present, full Hamiltonian was used to determine the hyperfine interactions for each iron site. Electric field gradient determined at low temperatures agrees with quadrupole splitting observed at room temperature. Absorption areas of the components at low and at high temperatures correspond well to the occupation of
Źródło:
Nukleonika; 2007, 52, supl. 1; 67-69
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostics of the plasma parameters based on the K X-ray line positions for various 4d and 4f metals
Autorzy:
Szymańska, E.
Syrocki, Ł.
Słabkowska, K.
Polasik, M.
Powiązania:
https://bibliotekanauki.pl/articles/148868.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma diagnostic
outer-shell ionization
K X-ray lines
Opis:
This paper shows the theoretical predictions of the outer-shell ionization effect on the positions of Kα1,2, Kβ1,3, and Kβ2 X-ray lines for some 4d-transition metals (molybdenum and palladium) and 4f rare-earth elements (dysprosium and ytterbium). The ionization energy shifts have been evaluated using the multiconfiguration Dirac-Fock method, containing Breit interaction and quantum electrodynamic (QED) corrections. The presented results are important for obtaining the information about some parameters of plasma generated by different sources, especially by pulsed power machine and short-pulse lasers.
Źródło:
Nukleonika; 2016, 61, 4; 437-441
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoluminescence and positron annihilation lifetime studies on pellets of ZnO nanocrystals
Autorzy:
Karbowski, A.
Fedus, K.
Patyk, J.
Bujak, Ł.
Służewski, K.
Karwasz, G.
Powiązania:
https://bibliotekanauki.pl/articles/148001.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
photoluminescence (PL)
positron annihilation lifetime spectroscopy (PALS)
X-ray diffraction (XRD)
ZnO nanocrystals
Opis:
We explore the interrelationships between the X-ray diffraction patterns, the photoluminescence spectra and the positron lifetimes obtained from circular pellets composed of commercial ZnO nanoparticles. The experimental results are studied as a function of thermal treatment at different temperatures. X-ray diffractograms reveal the temperature- independent wurtzite phase structure of nanocrystals and show huge enlargement of ZnO grains after annealing at temperatures higher than 700 centigrade. Photoluminescence measurements exhibit two emission bands : a near band edge emission in UV (small tilde 378 nm) and a defect-related broad visible peak with a maximum in the green region ( small tilde 502 nm). The significant enhancement of the green emission at the expense of UV luminescence is observed after sample sintering at 800 and 1000 centigrade. The positron annihilation lifetime spectroscopy (PALS) is applied in order to study the thermally induced evolution of defects. The lifetime components show a step-like dependence on the thermal treatment, but do not follow exactly the variation in crystallographic phases and only vaguely follow differences in photoluminescence. The positron data indicate therefore some additional structural and/or defect changes. The possible origin of green luminescence from ZnO pellets is discussed.
Źródło:
Nukleonika; 2013, 58, 1; 189-194
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Search of radiation hormesis in plants : irradiation of the cress (Lepidium sativum L.)
Autorzy:
Fornalski, K. W.
Adamowski, Ł.
Turowski, T. W.
Wojnarowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/146848.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cress
hormesis
ionizing radiation
Lepidium sativum L.
low dose
Opis:
The paper is composed of two parts : a review of a group of experiments among irradiated plants and own search for radiation hormesis in a single experiment. In the first part the Bayesian analysis of the hormetic-like data published so far shows that the NOAEL (no observed adverse effect level) point, above which adverse effects appear, may be located between 30 and 100 Gy. In the second part the influence of low doses of ionizing radiation was tested on the particularly fast growing plant, namely the cress (Lepidium sativum L.). Two experimental scenarios were used : in the first one the cress was irradiated during the growth (maximal dose 2.3 Gy), while in the second scenario dry seeds were irradiated (maximal dose 100 Gy). The experiment indicates that the NOAEL point lies above 100 Gy and statistically insignificant hormetic effect can be seen between 0.1 and 14 Gy. No linear reaction is observed in the full range of doses.
Źródło:
Nukleonika; 2012, 57, 3; 421-426
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 46

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