{"refrec":{"BRefID":252444,"RR":"<b>Oikawa, S.; Watabe, T.; Takata, H.; Suzuki, C.; Nakahara, M.; Misonoo, J.</b> (2013). Long term temporal changes of <sup>90</sup>Sr and <sup>137</sup>Cs in seawater, bottom sediment and marine organism samples - from the Chernobyl accident to immediately after the Fukushima accident. <i>Jpn. Analyst 62(6)</i>: 455-474. <a href=\"https://dx.doi.org/10.2116/bunsekikagaku.62.455\" target=\"_blank\">https://dx.doi.org/10.2116/bunsekikagaku.62.455</a>","BEntID":244139,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Jpn. Analyst 62(6)</i>: 455-474. <a href=\"https://dx.doi.org/10.2116/bunsekikagaku.62.455\" target=\"_blank\">https://dx.doi.org/10.2116/bunsekikagaku.62.455</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Oikawa, S.; Watabe, T.; Takata, H.; Suzuki, C.; Nakahara, M.; Misonoo, J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Oikawa, S. <i>et al.</i>","Englishabstract":"A radioactivity survey program was launched in 1983 to determine the background levels of artificial radionuclides, such as <sup>90</sup>Sr and <sup>137</sup>Cs in the marine environment off commercial nuclear power stations. In this paper, we report on the long-term temporal changes of <sup>90</sup>Sr and <sup>137</sup>Cs in seawater, bottom sediment and marine organism samples. Both <sup>90</sup>Sr and <sup>137</sup>Cs have been detected since the beginning of the program in the seawater samples. Their concentrations decreased slowly over time, except for a prompt rise of the <sup>137</sup>Cs concentration caused by the Chernobyl nuclear accident in 1986, and reached the level corresponding to 1-2 mBq L<sup>-1</sup> for both radionuclides just before the Fukushima accident. The concentration of <sup>137</sup>Cs in the bottom sediments widely varied, unlike that in seawater from one sampling site to another. The highest <sup>137</sup>Cs concentration was observed in marine organisms in 1986, when the Chernobyl nuclear accident occurred, and was followed by relatively high concentrations for some years. The <sup>137</sup>Cs concentration gradually decreased thereafter during the 1990s. The most recent results before the Fukushima accident suggested that the <sup>137</sup>Cs concentration would not be more than 1-2 mBq L<sup>-1</sup>, ND (below the detection limit) to 8 Bq kg<sup>-1</sup>-dry and ND to 0.24 Bq kg<sup>-1</sup>-wet, respectively, for seawater, bottom sediment and marine organism samples. A post-accident monitoring after the Fukushima accident revealed a heavy burden of artificial radionuclides in the marine environment adjacent to Fukushima Prefecture. This paper also summarizes the <sup>90</sup>Sr and <sup>137</sup>Cs monitoring data in the seawaters, bottom sediments and marine organisms immediately after the accident.    A comparison of data was made between the precedent situation before the accident and the post-accident situation in order to assess the impacts of the Fukushima accident on the adjacent marine environment.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Long term temporal changes of <sup>90</sup>Sr and <sup>137</sup>Cs in seawater, bottom sediment and marine organism samples - from the Chernobyl accident to immediately after the Fukushima accident","OrigTitleLangCode":"ja","OrigTitleLangCodeExtended":"jpn","OrigTitleLangID":33,"DateLastModified":{"date":"2026-06-05 01:31:01.767428","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"<sup>90</sup>Sr; <sup>137</sup>Cs","OtherDescriptors":null,"Notes":null,"AnaPub":2013,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2016-01-28","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000320900600001","VABBcode":null,"OpenAcc":1,"DOI":"10.2116/bunsekikagaku.62.455"},"refs":null,"anarec":{"AnaID":252444,"PubliDate":2013,"Pagination":"455-474","XtraPublOfAnaID":null,"ISBN":null,"Volume":"62","Issue":"6","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":252403,"SerRR":"Bunseki-Kagaku = Japan Analyst. 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