Results 271 to 280 of about 12,556,675 (343)

Thoron exhalation rates in areas of Japan

Radiation Protection Dosimetry, 2010
Thoron exhalation rates were measured with a newly made portable instrument at 33 areas in 7 prefectures of Japan. Thoron exhalation rates ranged from 49 to 4890 mBq m(-2) s(-1). Radon exhalation rates were also measured in many of the areas at the same time and ranged from 2.1 to 11 mBq m(-2) s(-1).
M, Shimo, Y, Ishimori, M, Hosoda, S, Tokonami   +3 more
openaire   +2 more sources

Factors controlling measurements of radon mass exhalation rate

Journal of Environmental Radioactivity, 2005
Radon mass exhalation rate of soil samples was measured using an exhalation chamber of 10 dm(3) volume and a Lucas cell. The results show that mass of sample, grain size and water content influence the radon mass exhalation rate. For soil of (226)Ra activity concentration about 2500 Bq kg(-1) and samples within the range from 0.20 kg to 0.50 kg, the ...
Dinh Chau, Nguyen, Edward, Chruściel, Lukasz, Prokólski   +2 more
openaire   +2 more sources

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

Radon exhalation rate in building materials

International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1991
Radon is present in trace amounts almost everywhere on the earth, being distributed in the soil, the ground water and in the lower atmosphere. Radon can originate from a deeply burried deposit and can migrate to the surface of earth by diffusion and transport process.
A. Rawat, P.J. Jojo, A.J. Khan, R.K. Tyagi, Rajendra Prasad   +4 more
openaire   +1 more source

Measuring radon exhalation rate through three cycles

Journal of Instrumentation, 2012
This paper proposes that the radon exhalation rate can be calculated through three measurement cycles performed by a radon monitor based on the electrostatic collection method. The first cycle time is 20 min, the measured value in this cycle falls into disuse. The radon concentrations in the next two long cycles can be accurately measured.
Y Tan, D Xiao
openaire   +1 more source

Estimation of global radon exhalation rate distribution

AIP Conference Proceedings, 2008
A radon exhalation rate distribution model was developed, which considers dependency on soil water saturation, soil temperature and soil texture. The global averages of the radon exhalation rates were calculated to be 17.5 and 18.0 mBq⋅m−2⋅s−1 by the model with different input soil moisture data.
Masayoshi Goto, Jun Moriizumi, Hiromi Yamazawa, Takao Iida, Weihai Zhuo, Anselmo Salles Paschoa, Friedrich Steinhäusler   +6 more
openaire   +1 more source

Influence of soil environmental parameters on thoron exhalation rate

Radiation Protection Dosimetry, 2010
Field measurements of thoron exhalation rates have been carried out using a ZnS(Ag) scintillation detector with an accumulation chamber. The influence of soil surface temperature and moisture saturation on the thoron exhalation rate was observed. When the variation of moisture saturation was small, the soil surface temperature appeared to induce a ...
M, Hosoda, S, Tokonami, A, Sorimachi, T, Ishikawa, S K, Sahoo, M, Furukawa, Y, Shiroma, Y, Yasuoka, M, Janik, N, Kavasi, S, Uchida, M, Shimo   +11 more
openaire   +2 more sources

Suitability evaluation of measurement method for radon exhalation rate of porous medium containing radon adsorbing materials.

Journal of Hazardous Materials
In radon pollution control, materials with radon adsorbing characteristics will significantly affect the migration and release of radon. In this paper, radon adsorbing medium (activated carbon particles) is proposed to be added to the building foundation
Haofeng Wang, Yongjun Ye, Xuanli Yao, Liling Luo   +3 more
semanticscholar   +1 more source

The Determination of Radon Exhalation Rates

Health Physics, 1983
The exhalation of radon from porous materials like mining wastes and building materials can be determined by studying the growth of radon activity in vessels containing samples of the materials. It is demonstrated that the initial part of the activity growth curve determines the total free exhalation rate of the sample used, independently of container ...
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