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2023 Fiscal Year Final Research Report

Evaluation of with the aim of dose evaluation and tracer applications

Research Project

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Project/Area Number 20H04321
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionNagoya University

Principal Investigator

Yamazawa Hiromi  名古屋大学, 工学研究科, 教授 (70345916)

Co-Investigator(Kenkyū-buntansha) 森泉 純  名古屋大学, 工学研究科, 准教授 (90303677)
Project Period (FY) 2020-04-01 – 2024-03-31
Keywordsラドン壊変核種 / 域広大気域輸送 / Pb-210湿性沈着 / 大気拡散モデル
Outline of Final Research Achievements

The aim of this study was to elucidate the behavior and deposition distribution of radon decay nuclides by numerical simulations. After validating the long-range transport model with observation data, geographical deposition patterns in the northern hemisphere, Asia and Japan and their seasonal variations were evaluated. Mechanisms of the high Pb-210 deposition along the Sea of Japan coastline in winter were found. A high time resolution measurement system for Pb-214/Bi-214 concentrations in rain was developed. Mechanisms of wet deposition processes of the radon decay nuclides were made clear.

Free Research Field

環境放射能、大気環境

Academic Significance and Societal Importance of the Research Achievements

冬季日本海側でのPb-210沈着量は北半球内で特異的に大きいことと、その要因はユーラシア大陸東端での大気中蓄積と、季節風吹き出し及び日本海側での降水の重畳であることを証明した。これは、これまで観測値が時空間的に粗なために未解明であったメカニズムを解明したことになる。また、日本域での詳細な沈着量分布を得たことは、天然放射線源からの被ばくの我が国での最大因子であるラドン壊変核種の寄与が顕著な地域性を持つ可能性を示唆するものであり、被ばく評価及びその影響評価に我が国固有の新たな視点を提供するものである。

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Published: 2025-01-30  

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