Decontamination of radioactivity from contaminated vegetables derived from the Fukushima nuclear accident |
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| Institution: | 1. Advanced Science Research Center, Division of Tracer Kinetics, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8640, Japan;2. Radioisotope Research Center, Osaka University, Japan;3. Radiation Science Center, High Energy Accelerator Research Organization, Japan;4. Faculty of Engineering, The University of Tokyo, Japan;5. Radioisotope Center, The University of Tokyo, Japan;6. Radioisotope Research Center, The University of Tokushima, Japan;7. Radioscience Research Laboratory, Faculty of Science, Shizuoka University, Japan;1. Adiyaman University, Engineering Faculty, Department of Electrical and Electronic Engineering, 02040 Adiyaman, Turkey;2. Cukurova University, Art and Sciences Faculty, Physics Department, 01330 Adana, Turkey;3. University of Mersin, Science and Art Faculty, Physics Department, 33343 Mersin, Turkey;4. Cukurova University, Vocational School of Imamoglu, Department of Technical Programs, 01700 Adana, Turkey;5. Institute of Nuclear Science, Hacettepe University, 06532 Ankara, Turkey;6. Cukurova University, Medicine Faculty, Biophysics Department, Adana, Turkey;1. Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca S/N, La Marquesa, Ocoyoacac, Estado de México, C.P. 52750, Mexico;2. Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, 09340, Iztapalapa, Ciudad de México, Mexico;3. Retired from Università degli Studi di Roma La Sapienza, Roma, Italy;1. Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;2. X-ray Optics Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;1. Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH 45433, USA;2. Institute of Physical Optics, Dragomanov 23, L’viv 79005, Ukraine;3. Department of Physics, West Virginia University, Morgantown, WV 26506, USA |
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| Abstract: | Many kinds of vegetables were contaminated by a huge amount of radioactivity, such as 131I or 137Cs, derived from the Fukushima nuclear accident. The concentration of radioactivity in contaminated vegetables was higher than the value of the legal limit for shipment, therefore, we attempted to identify a simple and effective removal method for contaminated farm products to ensure the relief of farmers and the security of consumers. First, the radioactivity distribution and adhesion state of contaminated vegetables were investigated by an imaging plate (IP) image. As a result, there were two types of contamination, spot type or spread type, of vegetables. The removal of radioactivity by physical or chemical methods was investigated. As a result, radioactivity removal by water washing showed no significant difference between boiling water and cold water. There was no significant difference between hand washing and running water washing. The result of chemical removal showed that reducing agents removed radioactivity from vegetables by 70–80% for 131I and more than 80% for 137Cs. In particular, ascorbic acid is promising as a safe and versatile option. |
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