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Oral presentation

Online solid-phase extraction ICP-MS for determination of technetium-99 in environmental samples

Matsueda, Makoto; Terashima, Motoki; Takagai, Yoshitaka*

no journal, , 

Technetium-99 ($$^{99}$$Tc) is a pure beta-emitting radionuclide with a long half-life (210 000 years), produced with a yield of about 6% during the fission of $$^{235}$$U and $$^{239}$$Pu. The properties of high mobility in environment and concentrated into specific seaweeds were applied as a tracer for radioisotopes released into the environment. Inductively coupled plasma-mass spectrometry (ICP-MS) is the main method for $$^{99}$$Tc analysis; however, the isobars ($$^{99}$$Ru and $$^{98}$$MoH) interfere the quantification. In this study, a multi-stage separation and analysis system (online SPE-ICP-MS) for $$^{99}$$Tc was constructed by attaching a solid phase extraction (SPE) resin to a flow injection (FI) system and combining it with a collision reaction cell (CRC) in an ICP-MS. In addition, a high sensitivity for detecting trace amounts of $$^{99}$$Tc was developed.

Oral presentation

Investigation of polymerization reaction conditions on filter surface only using radiation-induced emulsion graft polymerization method for direct alpha-ray measurement

Horita, Takuma; Matsueda, Makoto; Oka, Toshitaka; Kitatsuji, Yoshihiro; Kino, Yasushi*

no journal, , 

no abstracts in English

Oral presentation

Local distribution and isotopic ratio of radiocesium in environment

Shimada, Asako; Tsukahara, Takehiko*; Nomura, Masao*; Takeda, Seiji

no journal, , 

Because of the accident at the Fukushima Daiichi Nuclear Power Station (1F), a large area of eastern Japan was contaminated by radiocesium. When radiocesium would be detected at the completion of their decommissioning in the site, estimation of the origin of which is from background originated 1F and fallout of atmospheric nuclear test or from decommissioned facilities will be important. Therefore, soils of 3 sites were collected by using U8 containers, and $$^{137}$$Cs radioactivity, $$^{134}$$Cs/$$^{137}$$Cs radioactivity ratios, $$^{135}$$Cs/$$^{137}$$Cs isotope ratios were determined. $$^{137}$$Cs radioactivity concentrations were varied in not only between sites but also in the same site, however, $$^{134}$$Cs/$$^{137}$$Cs radioactivity ratio was approximately constant in all sites. In case of highly contaminated soils, $$^{135}$$Cs/$$^{137}$$Cs isotope ratio was almost comparable to that for the soil collected at near the 1F. On the other hand, in case of lower contaminated soils, $$^{135}$$Cs/$$^{137}$$Cs isotope ratio was slightly higher than that for soil collected at near the 1F. It is possibly that fallout before the 1F accident contained $$^{135}$$Cs to increase the $$^{135}$$Cs/$$^{137}$$Cs isotope ratio.

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