Rapid analysis of U isotopes in vegetables using ICP-MS: application to the emergency U monitoring after the nuclear accident at TEPCO’s Fukushima Dai-ichi power station |
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Authors: | Jian Zheng Keiko Tagami Shigeo Uchida |
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Institution: | (1) Office of Biospheric Assessment for Waste Disposal, National Institute of Radiological Sciences, 491 Anagawa, Inage, Chiba 263-8555, Japan |
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Abstract: | After the nuclear accident at TEPCO’s Fukushima Dai-ichi power station in March, hydrogen explosions and reactor building
explosion resulted in releases of radionuclides in the environment. Severe radioactive cesium and iodine contaminations have
been observed in fallout deposition samples and soils in the East Japan. Radioactive cesium, iodine, uranium, and transuranic
radionuclides were set as the monitoring targets in food safety tests. However, so far, only radioactive cesium and iodine
were daily measured and reported by the Ministry of Health, Labour, and Welfare. The tedious and time consuming conventional
alpha spectrometric method hampered the emergency monitoring U contamination in foods. In this work, we propose a simple and
rapid analytical method for 238U and 235U/238U isotope ratio analysis in fresh vegetables. This method was applied to the emergency monitoring of radioactive contamination
after the nuclear accident at TEPCO’s Fukushima Dai-ichi power station. The results showed no U contamination in fresh vegetables
collected in Chiba and Ibaraki prefectures in April and May, 2011. |
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Keywords: | |
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