New development of study on atmospheric transport processes of environmental radioactivity

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360392
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Nagoya University
• Principal Investigator: YAMAZAWA Hiromi 名古屋大学, 工学(系)研究科(研究院), 教授 (70345916)
• Co-Investigator(Kenkyū-buntansha): MORIIZUMI Jun 名古屋大学, 大学院工学研究科, 准教授 (90303677) ; HIRAO Shigekazu 名古屋大学, 大学院工学研究科, 助教 (30596060)
• Research Collaborator: HIROUCHI Jun ; LIU Heng ; KONDO Daisuke
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 放射性核種 / ラドン壊変生成物 / 湿性沈着 / 洗浄係数 / 降水中濃度 / 空間線量率 / 地面上濃度推定

Outline of Final Research Achievements

A series of measurements were carried out for concentrations of radon decay products in rain water with a high time resolution. Temporal variations in the measured concentration, which followed the variation in rain intensity, were analyzed to formulate the washout coefficient of air-borne radionuclides as a function of rain intensity. It was demonstrated that the temporal variations in concentration in rain water were reproduced with a very high accuracy by using the proposed formula.
Methods for estimating surface concentrations of deposited radionuclides from temporal change in dose rate and from gamma-ray spectral information provided from monitoring installations were developed.

Free Research Field

環境放射能、環境影響評価