Biomagnification of 7Be, 234Th, and 228Ra in marine organisms near the northern Pacific coast of Japan

Journal of Environmental Radioactivity
Y IshikawaK Saga

Abstract

Enrichment of natural radionuclides of thorium, radium and beryllium in several kinds of marine organisms was investigated near the Pacific coast of Miyagi Pref., Japan. The radioactivity of 7Be, 210Pb, 234Th, 238U, 228Ra and 137Cs was measured using gamma spectrometry. High concentrations of 234Th were observed in ascidian livers (50-400 Bq/kg dry) and excrement (2000-2900 Bq/kg dry), although the parent 238U concentrations were less than 3 Bq/kg dry. Such extreme disequilibrium between 238U and 234Th activity was observed in other organisms (barnacles, mussels and brown algae). Relatively high concentrations of 228Ra were detected in ascidian livers and were observed to decrease according to its half-life (5.75 year), suggesting disequilibrium with its parent 232Th. High concentrations (about 1900-5000 Bq/kg dry) of 7Be were detected in ascidian liver. Possible mechanisms for the observed biomagnification and bioaccumulation of these radionuclides in the organisms analyzed were proposed.

Citations

Oct 24, 2006·Environmental Monitoring and Assessment·Joanna BurgerStephen C Jewett
Apr 14, 2009·Journal of Environmental Radioactivity·Sabine CharmassonDaniel Desbruyères
Oct 9, 2007·Journal of Environmental Radioactivity·Bruce RyanPaul Martin
Mar 29, 2016·PeerJ·Beatriz Baselga-CerveraCamino García-Balboa
Mar 22, 2015·Journal of Environmental Radioactivity·Matea KrmpotićDelko Barišić
Jul 16, 2014·Marine Pollution Bulletin·Önder KılıçFernando P Carvalho
Jun 10, 2010·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·A HosseiniT Yankovich
Dec 24, 2018·The Science of the Total Environment·A TejeraP Martel
May 27, 2021·Marine Pollution Bulletin·Naoko Murakami-SugiharaHiroshi Ogawa

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