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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

D. Ivanov, E. Shishkina, E. Pryakhin

Updated: Dec 11, 2020

EPR Studies of Fish Otoliths in the Investigation of Events Associated with Nuclear Security

D. Ivanov (M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Russia; Ural Federal University, Russia), E. Shishkina (Urals Research Center for Radiation Medicine, Russia; Chelyabinsk State University, Russia), E. Pryakhin (Urals Research Center for Radiation Medicine, Russia)


Radiation measurements are the basis for detecting events associated with nuclear security. Detection of the area of initial environment contamination as a result of criminal or deliberate unauthorized actions may be complicated by a short half-life and migration processes of radionuclides.

When traditional methods of radiation monitoring do not allow to unambiguously restore the picture of the incident, it is proposed to use additional detection methods, such is measurement of radiation-induced stable radicals in fish otoliths by electron-paramagnetic resonance (EPR). EPR can detect traces of ionizing radiation in calcified tissues, and the results can serve as evidence of radiation exposure long time after the end of radiation exposure. EPR dosimetry on the fish otoliths has been developed for radiobiological studies (Ivanov et al., Radiat. Environ. Biophys., 2018). It can be adopted as the method for nuclear security.

核セキュリティに関連するイベントの調査における魚の耳石のEPR研究

D. Ivanov (M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Russia; Ural Federal University, Russia), E. Shishkina (Urals Research Center for Radiation Medicine, Russia; Chelyabinsk State University, Russia), E. Pryakhin (Urals Research Center for Radiation Medicine, Russia)


放射線測定は原子力安全保障に関連する事象を検出するための基礎である。犯罪や意図的な不正行為の結果としての初期環境汚染領域の検出は、放射性核種の半減期が短いことや、移行プロセスによって複雑になることがある。従来の放射線モニタリング法では異常事象の状況を明確に把握できない場合、電子常磁性共鳴(EPR)を用いた魚の耳石中の放射線誘発安定ラジカルの測定など、追加の検出法を用いることが提案されている。EPRは、石灰化した組織中の電離放射線の痕跡を検出することができ、その結果は放射線被ばくの終了後も長期間にわたって放射線被ばくの証拠となり得る。魚の耳石上でのEPR線量測定は、放射線生物学研究のために開発された(Ivanov et al、Radiat. Environ. Biophys、 2018年)。それは原子力安全保障のための手法として採用することができる。