Development of Three-Dimensional Numerical Model for ^<222>Rn and Its Decay Products Coupled with a Mesoscale Meteorological Model II. Numerical Analysis on the Increase in Gamma Dose Rate Observed in the Coastal Area of Fukushima Prefecture
スポンサーリンク
概要
- 論文の詳細を見る
A three-dimensional Eulerian numerical model for 222Rn and its decay products coupled with a mesoscale meteorological model, MM5-TMNR, is applied to investigate the mechanism of the naturally induced increase in gamma dose rate observed at the coastal area of Fukushima prefecture in October 2002. The results obtained by MM5-TMNR are verified by comparisons with observed wind, precipitation and gamma dose rate to be adequate for examining the mechanism. The unusual increase in gamma dose rate is observed by the combination of the synoptic-scale (about 2000 to 5000 km horizontally) transport of natural radionuclides due to the inflow of cold air mass from the Asian Continent and the meso-β-scale (about 20 to 200 km horizontally) precipitation process within the coastal area of Fukushima prefecture. The contribution rate of natural radionuclides from the Asian Continent to the increase in gamma dose rate is estimated to be more than 60%.
- 社団法人 日本原子力学会の論文
- 2008-11-01
著者
-
CHINO Masamichi
Japan Atomic Energy Research Institute
-
NISHIZAWA Masato
Japan Atomic Energy Agency
-
NAGAI Haruyasu
Japan Atomic Energy Agency
-
Chino Masamichi
Japan Atomic Energy Agency
関連論文
- Ocean Model Coupling with Atmospheric Model for Prediction of Radioactivity Contaminant Dispersion in Emergency
- Development of Ocean Pollution Prediction System for Shimokita Region : Model Development and Verification
- Development of Three-Dimensional Numerical Model for ^Rn and its Decay Products Coupled with a Mesoscale Meteorological Model I. Model Description and Validation
- Numerical Simulations of Short-term Migration Processes of Dissolved Cesium-137 due to a Hypothetical Accident of a Nuclear Submarine in the Japan Sea
- Preliminary Estimation of Release Amounts of 131I and 137Cs Accidentally Discharged from the Fukushima Daiichi Nuclear Power Plant into the Atmosphere
- Development of Three-Dimensional Numerical Model for ^Rn and Its Decay Products Coupled with a Mesoscale Meteorological Model II. Numerical Analysis on the Increase in Gamma Dose Rate Observed in the Coastal Area of Fukushima Prefecture
- Improvement of Worldwide Version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI), (II) : Evaluation of Numerical Models by ^Cs Deposition due to the Chernobyl Nuclear Accident
- Development of an Atmospheric Dispersion Model for Accidental Discharge of Radionuclides with the Function of Simultaneous Prediction for Multiple Domains and its Evaluation by Application to the Chernobyl Nuclear Accident
- Preliminary Estimation of Release Amounts of ^I and ^Cs Accidentally Discharged from the Fukushima Daiichi Nuclear Power Plant into the Atmosphere
- Development of Local-Scale High-Resolution Atmospheric Dispersion Model Using Large-Eddy Simulation Part 1 : Turbulent Flow and Plume Dispersion over a Flat Terrain