Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 69(3): 103-115 (2020)


β-γ弁別型ベータ線スペクトロメーターの開発福島第一原発事故による90Sr汚染検査用可搬型β線検出器Development of β-γ Discriminatory Beta-ray Spectrometerβ-ray Portable Spectrometer for 90Sr-detection Due to Fukushima Dai-ichi Nuclear Power Plant Accident

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

受付日:2019年6月17日Received: June 17, 2019
受理日:2019年11月13日Accepted: November 13, 2019
発行日:2020年3月15日Published: March 15, 2020

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

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