会議発表用資料 Measurement of strontium-90 in Japanese soil samples after the Fukushima nuclear accident

Kavasi, Norbert  ,  Sarata Kumar, Sahoo  ,  Arae, Hideki  ,  Aono, Tatsuo  ,  Yoshida, Satoshi

2015-05-30
内容記述
The cooling systems of the nuclear reactors were damaged by a devastating tsunami that hit the Fukushima Daiichi Nuclear Power Plant, Japan, which resulted in a nuclear major accident (Level 7 of the International Nuclear and Radiological Event Scale) with intercontinental radioactive contamination. Among the released radionuclides, pure β-particle emitter fission products, such as 89Sr (T1/2 50.5 d) and 90Sr (T1/2 28.8 y) occurred. Radiostrontium is one of the most biologically hazardous radionuclides, consequently environmental monitoring to reveal the contaminated areas in Japan is essential. As radioactive contamination of 90Sr already exists in Japan originating from nuclear weapon testing, a measurement method with a low detection limit is necessary.In our work different soil samples collected from Fukushima, Chiba and Okinawa prefectures were analysed for 90Sr measurement.The soil samples were digested by open chemical method using concentrated HF, HNO3 and HCl acids. The strontium was chemically separated using extraction chromatography resin (Sr resin). Liquid scintillator counting system was used for 90Sr detection.The 90Sr activity concentrations in the soil samples were between 5 and 25 Bq/kg demonstrating low contamination compared to the Chernobyl accident and atmospheric nuclear weapon tests.
International Symposium on Radiological Issues for Fukushima's Revitalized Future

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