title: Factors controlling measurements of radon mass exhalation rate.
abstract: 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 radon mass exhalation rate values are higher than those for samples of other masses. The observed radon exhalation rate is an inverse function of the average grain size. At the water content about 6% by weight, the radon mass exhalation rate reaches maximum, then it decreases with both increasing and decreasing of the water content in the sample.
authors.affiliation: AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, PL 30-059 Kraków, Poland.
authors.forename: Dinh Chau
authors.initials: DC
authors.lastname: Nguyen
authors.forename: Edward
authors.initials: E
authors.lastname: Chruściel
authors.forename: Lukasz
authors.initials: L
authors.lastname: Prokólski
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D010316:Particle Size; D016062:Porosity; D011834:Radiation Monitoring; D011883:Radium / Q000032:analysis; D011886:Radon / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D014867:Water / Q000032:analysis
chemical_list: D000396:Air Pollutants, Radioactive; D012990:Soil Pollutants, Radioactive; D014867:Water; D011886:Radon; D011883:Radium