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Wyszukujesz frazę "radon exhalation rate" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    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
      Wyświetlanie 1-4 z 4

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