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Detailed deposition density maps constructed by large-scale soil sampling for gamma-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant accident
- Source :
- Journal of environmental radioactivity. 139
- Publication Year :
- 2013
-
Abstract
- Soil deposition density maps of gamma-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant (NPP) accident were constructed on the basis of results from large-scale soil sampling. In total 10,915 soil samples were collected at 2168 locations. Gamma rays emitted from the samples were measured by Ge detectors and analyzed using a reliable unified method. The determined radioactivity was corrected to that of June 14, 2011 by considering the intrinsic decay constant of each nuclide. Finally the deposition maps were created for (134)Cs, (137)Cs, (131)I, (129m)Te and (110m)Ag. The radioactivity ratio of (134)Cs-(137)Cs was almost constant at 0.91 regardless of the locations of soil sampling. The radioactivity ratios of (131)I and (129m)Te-(137)Cs were relatively high in the regions south of the Fukushima NPP site. Effective doses for 50 y after the accident were evaluated for external and inhalation exposures due to the observed radioactive nuclides. The radiation doses from radioactive cesium were found to be much higher than those from the other radioactive nuclides.
- Subjects :
- Radioactive Fallout
Soil test
Health, Toxicology and Mutagenesis
Soil sampling
chemistry.chemical_element
Geographic Mapping
Radiation
Gamma-ray emitting radioactive nuclides
Deposition density maps
law.invention
Japan
law
Radiation Monitoring
Nuclear power plant
Environmental Chemistry
Fukushima Nuclear Accident
Soil Pollutants, Radioactive
Nuclide
Waste Management and Disposal
Radioisotopes
Radiochemistry
Gamma ray
Sampling (statistics)
General Medicine
Gamma-ray spectrometry
Pollution
Fukushima Dai-ichi NPP accident
Deposition (aerosol physics)
chemistry
Caesium
Nuclear Power Plants
Subjects
Details
- ISSN :
- 18791700
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Journal of environmental radioactivity
- Accession number :
- edsair.doi.dedup.....9b3fc91c39e679b6f92cda5d310c3808