Results 291 to 300 of about 12,556,675 (343)

Machine learning as a tool for analysing the impact of environmental parameters on the radon exhalation rate from soil

, 2020
Interest in radon (Rn) is not limited only to its impact on health and its dose to the public, but due to its properties, the techniques to analyse its behavior can be used in many fields such as radiotherapy, atmospheric physics, geophysics, geohazards,
M. Hosoda, S. Tokonami, Takahito Suzuki, M. Janik   +3 more
semanticscholar   +1 more source

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

Radon Exhalation Rate of Some Building Materials Used in Egypt

Environmental Geochemistry and Health, 2005
Indoor radon has been recognized as one of the health hazards for mankind. Common building materials used for construction of houses, which are considered as one of the major sources of this gas in indoor environment, have been studied for exhalation rate of radon.
A F, Maged, F A, Ashraf
openaire   +2 more sources

In situ measurements of thoron exhalation rate in Okinawa, Japan

Radiation Protection Dosimetry, 2010
Thoron exhalation rates from the ground surface were measured at 57 sites on Okinawa Island, Japan, using a ZnS(Ag) scintillation detector equipped with photomultiplier. The arithmetic means ± SD, median ± SD, minimum and maximum of the rates (unit: Bq m(-2) s(-1)) were estimated to be 1.9 ± 1.4, 1.6 ± 0.3, 0.04 and 6.2, respectively.
Y, Shiroma, N, Isa, M, Hosoda, A, Sorimachi, T, Ishikawa, S, Tokonami, M, Furukawa   +6 more
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

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

Journal of Environmental Radioactivity, 2020
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.
G. de With, T. Kovács, A. Csordás, J. Tschiersch, J. Yang, S. Sadler, O. Meisenberg   +6 more
semanticscholar   +1 more source

Measurement of radon exhalation rate from some building materials

International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1992
Passive integrating CR-39 plastic track detectors were used to measure the radon exhalation rate from building materials used in our region. It was found that the radon exhalation rate varies from 12.6 to 169 mBq m-2 h-1 in 10 different building materials.
A.J. Khan, Rajendra Prasad, R.K. Tyagi
openaire   +1 more source

Revision for measuring radon exhalation rate in open loop

Journal of Instrumentation, 2013
We propose a novel method for quickly measuring the radon exhalation rate in open loop. We first obtain the temporal variation of radon concentration in the internal cell of the RAD7 by analyzing the work principle of RAD7. We then obtain the temporal variation of radon concentration in the ventilation-type accumulation chamber when the effects of ...
Y Tan, D Xiao, H Yuan, Q Tang, X Liu
openaire   +1 more source

Radon exhalation rate in south-east Sicily building materials

The European Physical Journal Special Topics, 2015
One of the main contributions to indoor radon levels is given by the exhalation from building materials. For this reason we performed measurements of radon exhalation rate in materials commonly used in buildings of the eastern Sicily. The measurements were carried out by using solid state nuclear track detectors in diffusion chambers.
Morelli D, Catalano R, Filincieri R, IMME', Giuseppina, Mangano G.   +4 more
openaire   +1 more source

An Assessment of In SituRadon Exhalation Measurements, and the Relation Between Free and Bound Exhalation Rates

Radiation Protection Dosimetry, 1992
By solving the diffusion equation for the axial-symmetric geometry of in situ radon exhalation measurements, the effect of the presence of the measuring device on the exhalation rate was determined. From analyses of the calculated growth curves of the radon concentration in the device it turned out that exhalation rates deduced from measurements ...
Aldenkamp, F.J., de Meijer, R.J., Put, L.W., Stoop, P.   +3 more
openaire   +2 more sources