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Updated: Aug 15, 2026
Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
Variation of (222)Rn activity concentration in soil gas at a site in Sapporo, Japan
Ryoko Fujiyoshi1, Moriyoshi Kinoshita, Sadashi Sawamura
1Graduate School of Engineering, Hokkaido University, 060-8628, Sapporo, Japan. fuji@qe.eng.hokudai.ac.jp
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.
