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    Wyświetlanie 1-7 z 7
    Tytuł:
    Radon and thoron exhalation rate measurements from building materials used in Serbia
    Autorzy:
    Čeliković, Igor T.
    Pantelić, Gordana K.
    Živanović, Miloš Z.
    Vukanac, Ivana S.
    Krneta Nikolić, Jelena D.
    Kandić, Aleksandar B.
    Lončar, Boris B.
    Powiązania:
    https://bibliotekanauki.pl/articles/148848.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    air exchange rate
    building materials
    radon exhalation rate
    Opis:
    The second most important source of indoor radon, after soil beneath dwelling, is building material. With the increase in environmental awareness and new energy-saving policies, residents tend to replace the existing windows with tighter windows, which leads to a decrease in air exchange rate and consequently an increase in indoor radon concentration. In case of low exchange rates, dose caused by inhalation of radon and its progeny can exceed external dose originating from the radium content in the surrounding building material. In this paper, surface exhalation rates of radon (222Rn) and thoron (220Rn) from typical building materials used for construction and interior decoration of houses in Serbia were investigated. Surface exhalation rate measurements were performed using the closed-chamber method, while concentrations of radon and thoron in the chamber were continuously measured using an active device, RTM1688-2, produced by SARAD® GmbH. Finally, the impact of the replacement of windows on the indoor radon concentration was estimated.
    Źródło:
    Nukleonika; 2020, 65, 2; 111-114
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radon levels after restoration of the U-mine disposal site
    Autorzy:
    Križman, M. J.
    Rojc, J.
    Jovanovič, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148914.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium mine
    restoration
    radon exhalation rate
    radon concentrations
    public exposure
    Opis:
    After cessation of the underground mining of uranium ore and production of uranium concentrate at Žirovski Vrh (Slovenia) in the period 1985–1990, two permanent surface disposal sites remained, namely, tailings pile and mine waste rock pile. Both disposal sites were of equal size of 4 hectares and were significant sources of radon. Their final restoration was designed in compliance with the condition of dose constraint for the public and authorized limits for radon exhalation from the remediated piles. In the late summer of 2008, a restoration of the mine waste pile was finished. Radon releases were reduced significantly by constructing an effective radon barrier of well compacted clayey material and a thick complex protective cover layer constructed over it. Radon exhalation rate from the mine waste area was lowered from primary level of 0.7 Bq/m2źs to natural levels (0.01 Bq/m2źs), and consequently, ambient radon levels also decreased on the site and nearby environment. The average radon contribution from the remaining U-mine sources was estimated on the basis of the environmental measurements of radon concentrations; they dropped from initial 7–9 Bq/m3 to approximately 3 Bq/m3. Further reduction of outdoor radon concentrations is expected after 2010, since the restoration of another disposal site will have been completed by the end of this year. Public exposure due to industrial radon after the first phase of restoration satisfactorily meets the dose constraint level of 0.3 mSv/y, since it decreased to less than 0.1 mSv/y.
    Źródło:
    Nukleonika; 2010, 55, 4; 523-527
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of exhalation rates through measurements of alpha and beta radiation with the aid of liquid scintillation counter
    Autorzy:
    Chau, N.
    Chruściel, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/148422.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    exhalation rate
    iquid scintillation counter
    Opis:
    In this paper, a method for the determination of the relative and mass exhalation rates is presented. For the measurement of radon content in an emanation chamber, an ?/ß liquid scintillation counter was applied. The method was preliminarily tested on the following samples: (1) samples of uranium tailing piles in the Kowary region, (2) samples obtained by mixing of the mentioned waste with various materials such as cement, gypsum and anhydrite and (3) samples of some building materials.
    Źródło:
    Nukleonika; 2003, 48, 3; 133-136
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Outdoor 222Rn behaviour in different areas of Slovakia
    Autorzy:
    Holý, K.
    Műllerová, M.
    Bulko, M.
    Holá, O.
    Melicherová, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/146357.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    activity concentration
    exhalation rate
    orography
    Opis:
    Radon activity concentration (RAC) in the outdoor atmosphere was monitored in four localities of Slovakia. The distance between the localities were up to 130 km. The localities had a diverse orography, ranging from flatland to hilly terrain. A significant infl uence of orography and 226Ra and 222Rn content in soil on diurnal time series of RAC was found. A simple approach of determining radon exhalation rate from soil based on the increase of RAC from daily minima to maxima and removal characteristic of radon is presented. A linear dependency between radon exhalation rate from the soil and RAC in the soil gas at a depth of 0.8 m was found for sandy soils.
    Źródło:
    Nukleonika; 2016, 61, 3; 281-288
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exhalation rate of radon-222 from concrete and cement mortar
    Autorzy:
    Perna, Allan Felipe Nunes
    Paschuk, Sergei Anatolyevich
    Corrêa, Janine Nicolosi
    Narloch, Danielle Cristine
    Barreto, Rafael Carvalho
    Del Claro, Flávia
    Denyak, Valeriy
    Powiązania:
    https://bibliotekanauki.pl/articles/147305.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cement mortar
    concrete
    exhalation rate
    radon-222
    Opis:
    The main sources of radon in the air of dwellings are soil, building materials, and groundwater. This study aimed to determine the exhalation rate of 222Rn from samples made of concrete and cement mortars, as well as to evaluate by means of gamma spectrometry the hazard indexes associated with other radionuclides present in the studied samples of building materials. The results obtained allowed the comparison of the exhalation rate of radon using theoretical calculations based on one-dimensional and three-dimensional models. Measurements of the activity concentration of radon in air was performed by AlphaGuard radon detector. Furthermore, obtained results were compared with the measurements performed inside the concrete test cells. These test cells were built with the aim of simulating a dwelling in small dimensions and to evaluate indoor radon activity associated with concrete. Consequently, the obtained results of radon exhalation rate, in becquerel per meter squared per hour, for the concrete was 2.55 ± 0.03 Bq•h–1•m–2 for the 1D model and 0.461 ± 0.008 Bq•h–1•m–2 for the 3D model. The exhalation rate of radon, for the cement mortar was 1.58 ± 0.03 Bq•h–1•m–2 for the 1D model and 0.439 ± 0.011 Bq•h–1•m–2 for the 3D model. The indoor concentration of 222Rn from the test cell was 112 ± 9 Bq/m3 . These values were below the limit of 300 Bq/m3 recommended by the International Commission on Radiological Protection (ICRP) and <148 Bq/m3 , the limit recommended by the US Environmental Protection Agency (US EPA). Even so, these values should be the subject of concern since that activity is related only to the contribution of concrete walls.
    Źródło:
    Nukleonika; 2020, 65, 3; 65-72
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the influence of chamber construction parameters on radon exhalation rate
    Autorzy:
    Kozłowska, B.
    Mazur, J.
    Kozak, K.
    Walencik-Łata, A.
    Baic, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147577.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    accumulation chambers
    exhalation rate
    measurement techniques
    radon
    Opis:
    Radon exhalation from ground is a process dependent on the emanation and migration of radon through ambient air. Most studies on radon exhalation from soil were performed regarding the influence of meteorological and soil parameters. As radon exhalation rate can be affected by the internal properties of the sample, it may also be influenced by the exhalation chamber geometry such as volume-to-area (V/S) ratio or other construction parameters. The measurements of radon exhalation from soil were made using different constructions of accumulation chamber and two types of radon monitors: RAD7 (Durridge) and AlphaGUARD PQ2000PRO (Genitron). The measurements were performed on one site in two locations and approximately at the same time. The first tests did not show the correlations of exhalation rate values and the chamber’s construction parameters and their geometrical dimensions. However, when examining the results, it seems that there are still too many factors that might have affected the process of radon exhalation. The future experiments are planned to be conducted in controlled laboratory conditions.
    Źródło:
    Nukleonika; 2016, 61, 3; 269-273
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Szybkość uwalniania się 222Rn z wód podziemnych do atmosfery
    222Rn release rate from groundwater to the atmosphere
    Autorzy:
    Przylibski, Tadeusz A.
    Maciejewski, Piotr
    Zagożdżon, Katarzyna D.
    Zagożdżon, Paweł P.
    Powiązania:
    https://bibliotekanauki.pl/articles/20197025.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Radon
    222 Rn
    wody gruntowe
    woda radonowa
    powierzchnia wody
    stężenie aktywności 222 Rn
    jednostka metamorficzna Śnieżnika
    groundwater
    radon water
    surface water
    222 Rn exhalation rate
    Śnieżnik metamorphic unit
    Opis:
    The authors conducted studies on the release rate of 222Rn from groundwater flowing out of a spring, from metamorphic reservoir rocks. This source gives rise to a stream about 205 m long. The activity concentration of Rn in the spring was about 700 Bq/dm33, took place at a distance of about 1 70-180 metres from the spring. With regard to the waterflow path, flowtime and the volume of water flowing through the cross-section of the tested stream, the exhalation coefficient of 222Rn from water to atmospheric air is 3.80 Bq/dm3/m, 1.51 Bq/dm3/s and 1. 25 Bq/dm3/dm3, respctively. According to the authors, further research conducted in other springs occurring in other types of rocks and under different flow conditions (at different times of the year) will allow characterizing the dynamics of the process of 222Rn release from groundwater through surface waters into the atmosphere. Perhaps this process can be described with a universal mathematical function.
    Źródło:
    Przegląd Geologiczny; 2022, 70, 10; 742-750
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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