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    Wyświetlanie 1-11 z 11
    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:
    Radon exposure in kindergartens in one Bulgarian district
    Autorzy:
    Angelova, Antoaneta
    Chobanova, Nina
    Kunovska, Bistra
    Djunakova, Desislava
    Ivanova, Kremena
    Stojanovska, Zdenka
    Powiązania:
    https://bibliotekanauki.pl/articles/24202747.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Bulgaria
    effective dose
    kindergarten
    passive detector
    radon concentration
    Opis:
    The major part of the radiation dose that humans receive from natural radioactive sources is due to inhalation of radon and its decay products. The study focuses on radon concentration (CRn) investigation in kindergartens and nurseries in the district of Montana. The infl uence of building characteristics on CRn was evaluated. The measurement of the CRn was performed using passive detectors. The survey was carried out between December 2019 and May 2020 with a total number of 602 detectors. The average value of CRn in the premises of the studied kindergartens and nurseries in this district is 125 Bq·m−3 , and the geometric mean (GM) value is 88 Bq·m−3 . The buildings that have built ventilation and sewerage systems have lower CRn. The effective doses of the children and workers were evaluated in order to assess the radon exposure.
    Źródło:
    Nukleonika; 2023, 68, 2; 51--56
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radon events in the U-mine environment and related radiation exposure
    Autorzy:
    Križman, M. J.
    Rojc, J.
    Peter, J. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/148916.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    uranium mine
    environment
    radon event
    effective dose
    Opis:
    The term �gradon event�h indicates here a sudden appearance of enhanced radon concentrations, observed like well expressed peaks in time series of radon concentrations. The peaks are superimposed on normal diurnal periodical curves. The characteristics of radon events are high peak values, a rather short duration and a low radon equilibrium factor. Since radon events appear only in the environment near significant radon emission sources, they were investigated in more detail in the case of the former .irovski Vrh uranium mine (Slovenia), using the existing network of continuous radon progeny measuring devices. Eight different types of radon events were identified in the vicinity of the U-mine disposal sites, lasting for some hours and with the range of their peak levels of equilibrium equivalent concentrations (EEC) of radon from a few Bq�Em.3 to over 200 Bq�Em.3. Exposures to radon events in units of Bq�Eh�Em.3 were estimated for adult individuals of the reference group. They resulted in relatively high effective doses of the range 1.5 �ĘSv per a single event, thus exceeding, e.g. the total effective dose for the public due to radioactive discharges from most nuclear facilities during the whole year.
    Źródło:
    Nukleonika; 2010, 55, 4; 529-533
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic and dynamical properties of dense ICF plasma
    Autorzy:
    Gabdullin, M. T.
    Kodanova, S. K.
    Ramazanov, T. S.
    Issanova, M. K.
    Ismagambetova, T. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/146117.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Coulomb logarithm
    effective interaction potential
    equation of state
    stopping power
    Opis:
    In present work, thermodynamic expressions were obtained through potentials that took into consideration long-range many-particle screening effects as well as short-range quantum-mechanical effects and radial distribution functions (RDFs). Stopping power of the projectile ions in dense, non-isothermal plasma was considered. One of the important values that describe the stopping power of the ions in plasma is the Coulomb logarithm. We investigated the stopping power of ions in inertial confi nement fusion (ICF) plasma and other energetic characteristics of fuel. Calculations of ions energy losses in the plasma for different values of the temperature and plasma density were carried out. A comparison of the calculated data of ion stopping power and energy deposition with experimental and theoretical results of other authors was also performed.
    Źródło:
    Nukleonika; 2016, 61, 2; 125-129
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural radioactivity in building materials in Iran
    Autorzy:
    Mehdizadeh, S.
    Faghihi, R.
    Sina, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147658.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma spectroscopy
    absorbed dose rate
    annual effective dose
    hazard index
    Opis:
    This work presents a comprehensive study of natural radioactivity in building materials used in Iran. For this purpose, 177 samples of five types of building material, i.e. cement, gypsum, cement blocks, gravel and brick, were gathered from different regions of the country and analyzed by gamma spectroscopy to quantify radioactivity concentrations using a high purity germanium (HPGe) detector and a spectroscopy system. According to the results of this investigation, cement samples had maximum values of the mean Ra-226 and Th-232 concentrations, 39.6 and 28.9 Bq/kg, respectively, while the lowest value for mean concentration of these two radionuclides were found in gypsum samples 8.1 and 2.2 Bq/kg, respectively. The highest (851.4 Bq/kg) and lowest (116.2 Bq/kg) value of K-40 mean concentration were found in brick and gypsum samples, respectively. The absorbed dose rate and the annual effective dose were also calculated from the radioactivity content of the radionuclides. The results show that the maximum values of dose rate and annual effective dose equivalent were 53.72 nGy/h and 0.37 mSv/y in brick samples. The radium equivalent activities Req calculated were below the permissible level of 370 Bq/kg for all building materials. The values of hazard indexes were below the recommended levels, therefore, it is concluded that the buildings constructed from such materials are safe for the inhabitants. The results of this study are consistent with the results of other investigations in different parts of the world.
    Źródło:
    Nukleonika; 2011, 56, 4; 363-368
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer investigation of some bcc, Fe - based, multicomponent alloys
    Autorzy:
    Olszewski, W.
    Szymański, K.
    Satuła, D.
    Oleszak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/147836.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Debye approximation
    effective thickness
    Mössbauer spectroscopy
    second order Doppler shift
    Opis:
    Mössbauer measurements of a Fe-based, bcc multicomponent alloys with concentration of non-ferrous element x = (0.1, 0.3 and 0.6) were performed. The effective thickness parameters and the second order Doppler shifts were determined as a function of temperature. The results indicate an apparent decrease of the recoilless fraction with x. The observed trends are consistent with theoretical results indicating modifications of phonon density of states by bond disorder.
    Źródło:
    Nukleonika; 2013, 58, 1; 165-168
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dose assessment and radioactivity of the mineral water resources of Dimeh springs in the Chaharmahal and Bakhtiari Province, Iran
    Autorzy:
    Shahbazi-Gahrouei, D.
    Saeb, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146762.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radium-226
    radon-222
    radioactivity
    effective dose
    Dimeh springs
    Chaharmahal and Bakhtiari
    Opis:
    . One of the main sources of public exposure from natural radioactivity is radium and radon and its short lived decay products. The aim of this study is focused on determining the concentration of mentioned radionuclides in the mineral water resources in one of the highest altitude regions (Zagros Mountains), the Chaharmahal and Bakhtiari province, in South-West Iran, namely the Dimeh springs. Eighty drinking spring water samples were taken from the Dimeh springs (ten samples for each spring) to determine radium-226 (226Ra) and radon-222 (222Rn) concentrations using the emanation method and a liquid scintillation counting method, respectively. The results of this study showed that the effective dose from the consumption of drinking water of Dimeh springs (6.4 žSv/y) is not comparable to the other annual effective dose such as inhalation of radon and its products in cosmic and terrestrial rays published by one of the authors previously. Also, the annual effective dose measured here is much lower than the worldwide mean value 0.45 mSv reported by USCEAR, 2000 and is also low enough and below the proposed limits in other countries and this is the reason why this sources of water may be considered as safe drinking water in the region.
    Źródło:
    Nukleonika; 2008, 53, 1; 31-34
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rapid estimation of environmental radioactivity surrounding Xiangshan uranium deposits, Jiangxi province, Eastern China
    Autorzy:
    Gan, N.
    Cen, K.
    Ye, R.
    Li, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/148900.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma dose rate
    indoor radon
    water radon
    cesium
    annual effective dose
    Xiangshan uranium deposit
    Opis:
    The surveys of terrestrial gamma dose rate, radon concentration indoor and in water and specific activity of radionuclides of soil were carried out in 14 villages and a town in Xiangshan uranium deposit and surrounding area, Jiangxi province, Eastern China, in 2017–2018, using a scintillator dosemeter, an ionization chamber and a high-purity germanium gamma spectrometer to study radiation status in these places after remediation. A radioactive hot spot was discovered in a village near the mining office, where specific activity of 238U, 226Ra, 232Th and 137Cs of soil was as high as 1433 ± 76 Bq/kg, 1210 ± 62 Bq/kg, 236 ± 13 Bq/kg and 17 ± 1.1 Bq/kg, respectively. The dose rate on a waste rock heap was about 2423 nGy/h. Approximately 50% of the houses in a village near the uranium mining site had radon concentrations that exceeded 160 Bq/m3 . There was a significant positive correlation between indoor radon concentration and outdoor gamma dose rate (R2 = 0.7876). The abnormal radon concentration was observed in a rising spring sample providing residents with tap water up to 127.1 Bq/l. Four tap water samples and three of five well water samples exceeded the limit of radon concentration of drinking water in China (11.1 Bq/l). The mean annual effective doses from gamma dose rate data were 0.86 mSv/y and 1.13 mSv/y for indoor radon. The study shows that there are some radioactively contaminated places surrounding the Xiangshan uranium mine. The local outdoor dose rate averages may be used to estimate local indoor radon concentrations.
    Źródło:
    Nukleonika; 2018, 63, 4; 113-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the electron capture process in semiclassical plasma
    Autorzy:
    Seisembayeva, M. M.
    Dzhumagulova, K. N.
    Ramazanov, T. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/146223.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    capture time
    differential cross-section
    partially ionized plasma
    perturbation theory
    effective interaction potential
    electron capture radius
    Opis:
    In this work, the process of electron capture in partially ionized plasma is considered. Electron- -atom interaction was described by the effective interaction potential, which takes into account the screening effect at large distances and the diffraction effect at the small distances. The results of numerical calculations of the electron capture radius, differential cross-section for different values of the coupling and density parameters are presented. The differential cross-section was obtained on the basis of perturbation theory and also by solving of the equation of motion of the projectile electron.
    Źródło:
    Nukleonika; 2016, 61, 2; 201-205
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Features of the structural and magnetic properties of Pb(TixZr1–xO3)-NiFe1.98Co0.02O4 in the polarized state
    Autorzy:
    Baev, V.
    Budzyński, M.
    Laletin, V.
    Mitsiuk, V.
    Poddubnaya, N.
    Surowiec, Z.
    Yanushkevich, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147993.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer effect
    X-ray diffraction
    lead zirconate titanate
    PZT
    unpolarized and polarized states
    specific magnetization
    magnetic susceptibility
    effective magnetic fields
    Opis:
    Composites with a 90%Pb(TixZr1–xO3)-10%NiFe1.98Co0.02O4 composition have been synthesized. It has been established that the polarization of samples resulting from exposure to an electric field for 1 hour of 4 kV/mm in strength at a temperature of 400 K leads to crystal structure deformation. The compression of elementary crystal cells in some areas during polarization of the sample creates conditions suitable for the enhancement of magnetic exchange interactions. It has been found that the polarization process of such compositions leads to increases in specific magnetization and magnetic susceptibility. The analysis of Mössbauer spectra has shown that the polarization of the 90%Pb(TixZr1–xO3)-10%NiFe1.98Co0.02O4 composite leads to significant changes in the effective magnetic fields of iron subspectra in various positions.
    Źródło:
    Nukleonika; 2017, 62, 2; 91-94
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of the radon progeny particle size distributions in the domestic environment. Epidemiological and dosimetric dose estimates
    Autorzy:
    Mamont-Cieśla, K.
    Stawarz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/146844.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon progeny particle size distribution (RPPSD)
    weighted dose conversion factors
    dosimetric/epidemiological effective dose estimate
    conversion convention
    unattached fraction
    radon dose evaluation program (RADEP)
    Opis:
    Measurements of the short-lived radon progeny particle size distributions were performed under realistic natural conditions in 54 dwellings in 6 regions of Poland by means of the Radon Progeny Particle Size Spectrometer (RPPSS). The RPPSS comprises a one open face stage, a 4-stage diffusion battery and a 3-stage multi-hole inertial impactor. It was manufactured at the ARPaNSA (Melbourne, Australia), under supervision of Dr S. B. Solomon and supplied with his software. While using the continuous mode, the programme provides analysis of the potential alpha energy concentration on each stage, particle size distributions and weighted dose conversion factors based on the ICRP human respiratory tract model (HRTM) as implemented in the computer code RADEP (radon dose evaluation program). The unattached fraction indoors ranges from ca. 0 to 53% with an arithmetic mean and median of 17%. The equilibrium factor F was observed in the range from 7 to 64% with an arithmetic mean of 32% and median of 29%. The annual effective doses from radon progeny for the general population were estimated according to two models: epidemiological and dosimetric. The mean values of the ratios of the dosimetric to epidemiological dose estimates for the general population (breathing rate 0.78 m3/h) and workers (breathing rate 1.2 m3/h) are 1.0 and 1.4, respectively. The epidemiological dose estimates for the general population are smaller in comparison with the dosimetric estimates for the unattached fraction fp greater than 17%. It was shown that the dependence of the ratio of the doses estimated on the basis of two models on the unattached fraction fp is well described by a linear equation.
    Źródło:
    Nukleonika; 2012, 57, 3; 411-420
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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