東北大学サイクロトロン・ラジオアイソトープセンターCyclotron and Radioisotope Center, Tohoku University
東日本大震災に伴う東京電力福島第一原子力発電所の事故による環境放射能汚染，核燃料冷却材放射能汚染，瓦礫放射能などに対して，β線のみを放射する半減期28.8年の90Srの放射能測定が重要視されている。このため，101～107 Bq/kgの放射能濃度まで短時間で測ることが可能な装置が要求され，β線だけを選別測定しそのスペクトルをとる可搬型の装置が開発され数十Bq/kgの精度で食材等の放射能測定に成功した。
As for environmental radiation contamination, nuclear fuel coolant radioactive contamination and that from radioactive debris etc., due to the accident at the Fukushima Dai-ichi Nuclear Power Plant that accompanied the Great East Japan Earthquake, the portable type conventional detection system of 90Sr has been strongly waited. Presently 90Sr is a main radioactive nucleus, the half-life of which is 28 years and radiation by 90Sr is β-ray only. A portable-type detection system which is capable of measuring the radioactivity concentration of 101 to 107 Bq/kg, together with the β-ray spectrum, has been developed successfully by means of β-γ discrimination technique.
Key words: β-ray spectrometer; β-γ discrimination-type detector; radioactive caesium; strontium-90; secular equilibrium β-decay
© 2020 公益社団法人日本アイソトープ協会© 2020 Japan Radioisotope Association
This page was created on 2019-12-23T14:00:29.153+09:00
This page was last modified on 2020-03-06T11:58:46.000+09:00
このサイトは（株）国際文献社によって運用されています。
