Enhanced Analysis Methods to Derive the Spatial Distribution of 131I Deposition on the Ground by Airborne Surveys at an Early Stage after the Fukushima Daiichi Nuclear Power Plant Accident
| Autor: | Daniel J. Blumenthal, Takeshi Sugita, Tatsuo Torii, Michael S. Reed, Colin E. Okada |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Radioactive Fallout
Time Factors Aerial survey Meteorology Epidemiology Health Toxicology and Mutagenesis Spatial distribution law.invention Iodine Radioisotopes Radiation Monitoring law Nuclear power plant Fukushima Nuclear Accident Radiology Nuclear Medicine and imaging Spatial Analysis Radionuclide business.industry Air Data Collection Radioactive waste Deposition (aerosol physics) Cesium Radioisotopes Nuclear Power Plants Environmental science Survey data collection Stage (hydrology) Nuclear medicine business |
| Zdroj: | Health Physics. 105:192-200 |
| ISSN: | 0017-9078 |
| Popis: | This paper applies both new and well tested analysis methods to aerial radiological surveys to extract the I ground concentrations present after the March 2011 Fukushima Daiichi nuclear power plant (NPP) accident. The analysis provides a complete map of I deposition, an important quantity incalculable at the time of the accident due to the short half-life of I and the complexity of the analysis. A map of I deposition is the first step in conducting internal exposure assessments, population dose reconstruction, and follow-up epidemiological studies. The short half-life of I necessitates the use of aerial radiological surveys to cover the large area quickly, thoroughly, and safely. Teams from the U.S. Department of Energy National Nuclear Security Administration (DOE/NNSA) performed aerial radiological surveys to provide initial maps of the dispersal of radioactive material in Japan. This work reports on analyses performed on a subset of the initial survey data by a joint Japan-U.S. collaboration to determine I ground concentrations. The analytical results show a high concentration of I northwest of the NPP, consistent with the previously reported radioactive cesium deposition, but also shows a significant I concentration south of the plant, which was not observed in the original cesium analysis. The difference in the radioactive iodine and cesium patterns is possibly the result of differences in the ways these materials settle out of the air. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|