| Project/Area Number |
21K12228
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
|
|---|
| Research Institution | National Institutes for Quantum Science and Technology |
|---|
Principal Investigator |
Janik Miroslaw 国立研究開発法人量子科学技術研究開発機構, 放射線医学研究所 計測・線量評価部, 研究員 (30833933)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
小平 聡 国立研究開発法人量子科学技術研究開発機構, 放射線医学研究所 計測・線量評価部, グループリーダー (00434324)
ゴメス クリストファー 神戸大学, 海事科学研究科, 教授 (20800577)
|
|---|
| Project Period (FY) |
2021-04-01 – 2024-03-31
|
| Project Status |
Completed (Fiscal Year 2023)
|
| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | radon / thoron / carbon dioxide / soil permeability / radon modelling / active faults / permeability / modelling / active fault / radon transport / radon in soil |
|---|
| Outline of Research at the Start |
Soil is a major source of the natural radioactive gases radon (Rn) and thoron (Tn). However, while proving very useful for monitoring faults and volcanic activity, Rn emissions can be severely detrimental to human health. Previous investigation of indoor Rn near Fugendake volcano showed elevated Rn concentration value. Since Rn elevation does not necessarily occur in all faults, and the mechanism of this enhancement is still debated, it seems reasonable to investigate how closely there is a relationship between Rn in soil near the tectonic faults and Rn exhaled at the surface.
|
| Outline of Final Research Achievements |
Radon (Rn) is a radioactive gas that naturally emanates from the decay of uranium in soil, rock, and water. It can accumulate in buildings, posing significant health risks, including lung cancer, especially with prolonged exposure.
Radon concentrations, along with related parameters such as CO2 levels and soil permeability, were investigated in soil and subsoil near active faults where high radon concentrations may occur. A strong correlation was observed between the distance from the fault and the concentrations of both CO2 and radon. It is suggested that radon is transported from deep layers within the soil by a carrier gas like CO2, and that high soil permeability is due to the fracture structure. Sites were classified based on the radon index (RI), and the geological radon potential was calculated. Due to Japan's geological characteristics, it is expected that more sites will be classified into the high RI zone.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究で示した土壌中のラドンや二酸化炭素の濃度と土壌透過性を関連付ける野外調査データは、日本全土の包括的な地質ラドンポテンシャルマップの作成に貢献すると考えられる。このようなマップは、ラドン曝露からの公衆安全を確保するために活用されるとともに、ラドンレベルの潜在的変動を評価するための地質学的ハザード研究に資する。マップ化により高リスク地域であることがわかれば、新しい建物を建設する際に、屋内でのラドンガスの蓄積を防ぐための積極的なアプローチを実施することができるようになる。
|
