Study on chemical condition of transported radioactive materials from the Fukushima Daiichi Nuclear Power Plant accident

A tremendous amount of radioactivity in the atmosphere was discharged due to Fukushima dai-ichi nuclear power plant accident. We collected from March 15 to May 15, 2011, on glass-cellulose fiber filters (HE-40T) and charcoal filters (CP-20) with low-volume air samplers at radioisotope center, University of Tsukuba. And we have been reported the time variation of the radioactivity concentrations of several radionuclides in atmosphere. In this work, we observed IP image of the glass-cellulose fiber filters after over 10 months at the accident. The IP image was showed clearly a lot of particulate matter. The divided filters were leached several solutions (dilute hydrochloric acid, dilute sodium oxalate aqueous solution, and distilled water), and were observed IP image and gamma-ray spectrometry. It is showed to be different solubility of filter samples at collected date. (author)