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Soil radon in winter months under snowpack in Hokkaido, Japan

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Title: Soil radon in winter months under snowpack in Hokkaido, Japan
Authors: Fujiyoshi, Ryoko Browse this author →KAKEN DB
Okabayashi, Masanori Browse this author
Sakuta, Yousuke Browse this author
Okamoto, Kazumasa Browse this author
Sumiyoshi, Takashi Browse this author →KAKEN DB
Kobal, Ivan Browse this author
Vaupoti, Janja Browse this author
Keywords: Radon
Soil air
Issue Date: 1-Oct-2013
Publisher: Springer
Journal Title: Environmental earth sciences
Volume: 70
Issue: 3
Start Page: 1159
End Page: 1167
Publisher DOI: 10.1007/s12665-012-2203-0
Abstract: Soil radon (Rn-222) has been monitored during winter months under cool-temperate deciduous stands of different surface geology in Tomakomai and in Sapporo, Hokkaido, Japan. Radon level was lower in Tomakomai of immature soil of porous volcanic ash emitted from an active volcano (Mt. Tarumae), compared with those in Sapporo of alluvial sediments. In Tomakomai, mean value of the Rn-222 activity concentration was higher in winter (570 Bq m(-3)) than in summer (350 Bq m(-3)) at a depth of 1 m, which is consistent with the results in cold and dry winter reported in the literature. In contrast, soil radon decreasing with decreasing soil temperature from mid-September (5.0 kBq m(-3)) remained low (2.6 kBq m(-3)) under persistent snow in Sapporo, which had already been observed in the same location. Measurements of the activity concentrations of Rn-222 in snow and in snow air as well as in soil air indicate that the small amount of Rn-222 is released from the ground surface to the overlying snowpack with a Rn-222 flux density of 0.4 mBq m(-2) s(-1) under thick snow cover in Sapporo.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤吉 亮子

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