{"created":"2023-05-15T14:52:19.808609+00:00","id":71447,"links":{},"metadata":{"_buckets":{"deposit":"255c7ab5-ce43-44ca-83fb-a5e90cec81ff"},"_deposit":{"created_by":1,"id":"71447","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"71447"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00071447","sets":["10:28"]},"author_link":["702452","702457","702456","702454","702453","702455","702459","702449","702448","702458","702451","702450"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2014-04-29","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"　The 2011 off the Pacific coast of Tohoku Earthquake and tsunami on March 11, 2011 have led to the accident of TEPCO’s Fukushima Dai-ich Nuclear Power Station (FNPS) and large amount of radioactive material were discharged by the hydrogen explosion and leaked from FNPS to the ocean. About two years have passed after the accident, radiocaesium in seawater off Fukushima except for part of area is decreasing to the level before the accident. However, because the decrease of rate of radiocaesium in marine sediment is more slowly than that in seawater, it is worried to influence on marine biota dwelled around the seabed over the long term. The aim of this study was to elucidate the variation and behavior of radiocaesium (134Cs and 137Cs) concentration in sediment cores collected from three sites in 5 km-20 km area from FNPS (NP2 site ; 37° 25 N, 141°06 E, water depth 30 m, AN6 site ; 37° 33 N, 141°07 E, water depth 30 m, and M01 site ; 37° 33 N, 141°20 E, water depth 60 m) in May and October 2013. Sediment samples (0 cm-14 cm) were dried, crushed and the coarse fractions were removed using a 1 mm sieve. Sieved sediment samples were filled in plastic container, and hen measured concentration of 134Cs and 137Cs using Ge detectors. The loss on ignition method was used to estimate the organic matter content : the samples were heated in a high temperature microwave muffle furnace at 750 ℃ for 1 hour. \n　Vertical changes of 134Cs concentration (Bq kg-1) ranged 17- 28, 8.2-53, and 4.2-11 at NP2, AN6 and M01 sites as of May 2013, respectively. In October 2013, 134Cs concentration at NP2 site ranged from 6.1 to 54 and 134Cs concentration in sediment except for 0 cm-1 cm layer in October 2013 decreased to 27 %-50 % of 134Cs concentration in May. At NP2 and M01 sites in May 2013, 134Cs concentration was higher in the shallow layer (0 cm-1 cm). On the contrary, at AN6 site in May 2013 and NP2 site in October, 134Cs concentration was higher in the middle layer (4 cm-5 cm). Trend of organic content at all stations were consistent with that of vertical change of 134Cs concentration. 134Cs inventory in sediment layer below 3 cm, using usually monitoring data, at all stations were 30 %-85 % of total 134Cs inventory. It is considered that radiocaesium adsorbed organic matter transported to deep layer when bioturbation happened.","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"European Geoscience Union general assembly 2014","subitem_description_type":"Other"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"福田, 美保"}],"nameIdentifiers":[{"nameIdentifier":"702448","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"青野, 辰雄"}],"nameIdentifiers":[{"nameIdentifier":"702449","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田, 聡"}],"nameIdentifiers":[{"nameIdentifier":"702450","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"石丸隆"}],"nameIdentifiers":[{"nameIdentifier":"702451","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"神田穣太"}],"nameIdentifiers":[{"nameIdentifier":"702452","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"伊藤友加里"}],"nameIdentifiers":[{"nameIdentifier":"702453","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山崎, 慎之介"}],"nameIdentifiers":[{"nameIdentifier":"702454","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"et.al"}],"nameIdentifiers":[{"nameIdentifier":"702455","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"福田 美保","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"702456","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"青野 辰雄","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"702457","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田 聡","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"702458","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山崎 慎之介","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"702459","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"Change of radiocaesium concentration recorded in the Fukushima coastal area in May. and Oct. 2013","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Change of radiocaesium concentration recorded in the Fukushima coastal area in May. and Oct. 2013"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-05-27"},"publish_date":"2014-05-27","publish_status":"0","recid":"71447","relation_version_is_last":true,"title":["Change of radiocaesium concentration recorded in the Fukushima coastal area in May. and Oct. 2013"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:51:09.995437+00:00"}