Results 251 to 260 of about 5,440,860 (285)

Measurement of Thoron Exhalation Rates from Building Materials

Health Physics, 2014
Thoron (220Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in dwellings. However, contrary to radon (220Rn), limited information on thoron exposure is available. The purpose of this study is to develop a test method for the determination of the thoron exhalation rate from building ...
G, de With, P, de Jong, A, Röttger
openaire   +2 more sources

Influence of air stability and metabolic rate on exhaled flow

Indoor Air, 2014
The characteristics of contaminant transport and dispersion of exhaled flow from a manikin are thoroughly studied in this article with respect to the influence of two important factors: air stability conditions and metabolic rates. Four cases with the combinations of stable and neutral conditions as well as lower (1.2 met) and higher (2 met) metabolic ...
Xu, C., Nielsen, P. V., Gong, G., Jensen, R. L.; id_orcid 0000-0001-7008-2601, Liu, Li   +4 more
openaire   +3 more sources

Radioactivity and radon exhalation rates of building materials in The Netherlands

Science of The Total Environment, 1985
About 140 samples of building materials have been analysed by gamma spectrometry for their Ra-226, Th-232 and K-40 concentrations. The radon exhalation rate was measured from concrete slabs of different composition including fly-ash components. The activity concentrations of materials containing soil products, like clay bricks and concrete, proved to ...
J G, Ackers, J F, den Boer, P, de Jong, R A, Wolschrijn   +3 more
openaire   +2 more sources

Intercomparison on the measurement of the thoron exhalation rate from building materials

Journal of Environmental Radioactivity, 2021
Thoron (220Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in dwellings. However, contrary to radon (222Rn), limited information on thoron exposure is available. As a result no harmonized test procedures for determining thoron exhalation from building materials are available at ...
G. de With, T. Kovács, A. Csordás, J. Tschiersch, J. Yang, S.W. Sadler, O. Meisenberg   +6 more
openaire   +3 more sources

Radon and Thoron exhalation rate map in Japan

AIP Conference Proceedings, 2008
Measurements of radon and thoron exhalation rates have been done using the radon and thoron exhalation rate measuring instrument adopting the accumulation method. We obtained the 111 data in the 40 sites of the 14 prefectures in Japan. The arithmetic average value of the radon and thoron exhalation rates by all 111 data were obtained to be 8.6 mBq⋅m−2 ...
Hosoda Masahiro, Shimo Michikuni, Sugino Masato, Furukawa Masahide, Fukushi Masahiro, Minami Kazuyuki, Ejiri Kazutaka, Anselmo Salles Paschoa, Friedrich Steinhäusler   +8 more
openaire   +1 more source

Relation Between Limiting Exhalation Flow Rate and Lung Volume

IEEE Transactions on Biomedical Engineering, 1987
A previous communication presented a procedure to convert perturbational airways resistance to plethysmographic resistance. While working with this procedure, we discovered that one of the unknown exhalation parameters must be, set to a value of 1.0, and another represents the inverse of the respiratory system time constant.
Arthur T. Johnson, Joel M. Milano
openaire   +2 more sources

ASSESSMENT OF RADIOACTIVITY AND RADON EXHALATION RATE IN EGYPTIAN CEMENT

Health Physics, 2004
The cement industry is considered as one of the basic industries that plays an important role in the national economy of developing countries. Activity concentration of 238U, 232Th, and 40K in local cement types from different Egyptian factories has been measured using a shielded HPGe detector.
openaire   +2 more sources

Natural radioactivity and radon exhalation rate in Brazilian igneous rocks

Applied Radiation and Isotopes, 2011
This paper reports the natural radioactivity of Brazilian igneous rocks that are used as dimension stones, following the trend of other studies on the evaluation of the risks to the human health caused by the rocks radioactivity as a consequence of their use as cover indoors. Gamma-ray spectrometry has been utilized to determine the (40)K, (226)Ra and (
Moura, C. L., Artura, A. C., Bonotto, Daniel Marcos, Guedes, S., Martinelli, C. D.   +4 more
openaire   +3 more sources

Natural radioactivity and radon exhalation rate of soil in southern Egypt

Applied Radiation and Isotopes, 2001
The level of natural radioactivity in soil of 30 mining samples collected from six locations in southern Egypt was measured. Concentrations of radionuclides in samples were determined by gamma-ray spectrometer using HPGe detector with a specially designed shield.
A, Sroor, S M, El-Bahi, F, Ahmed, A S, Abdel-Haleem   +3 more
openaire   +2 more sources

Radon Exhalation Rates and Gamma Doses from Ceramic Tiles

Health Physics, 1998
This study was carried out to assess the possible radiological hazard resulting from the use of zircon in glaze applied to tiles used in buildings. The 226Ra content of various stains and glazing compounds was measured using gamma spectroscopy and the 222Rn exhalation rates for these materials were measured using adsorption on activated charcoal.
R S, O'Brien, H, Aral, J R, Peggie
openaire   +2 more sources