title: Variation of (222)Rn activity concentration in soil gas at a site in Sapporo, Japan.
abstract: Several factors controlling the soil radon level in the present site were found to be changing air-filled porosity caused by fluctuations in moisture content, differences between the atmospheric and soil temperatures as well as volumetric (226)Ra content of the soil. The radon activity increased significantly in early October, especially at point 1, possibly as a result of a magnitude 8.0 earthquake which occurred on September 26, 2003, with epicenter located offshore near Tokachi, Hokkaido.
authors.affiliation: Graduate School of Engineering, Hokkaido University, 060-8628, Sapporo, Japan. fuji@qe.eng.hokudai.ac.jp
authors.forename: Ryoko
authors.initials: R
authors.lastname: Fujiyoshi
authors.forename: Moriyoshi
authors.initials: M
authors.lastname: Kinoshita
authors.forename: Sadashi
authors.initials: S
authors.lastname: Sawamura
mesh_terms: D004190:Disasters; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D007564:Japan; D011886:Radon / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D013051:Spectrometry, Gamma; D013696:Temperature
chemical_list: D012987:Soil; D011886:Radon