Fixed Point Observations and Characterization of Radioactive Caesium in Tama River

Radioisotopes Pub Date : 2021-05-15 DOI:10.3769/RADIOISOTOPES.70.227

Kenta Hagiwara, Kotaro Ochi, Yuya Koike

{"title":"Fixed Point Observations and Characterization of Radioactive Caesium in Tama River","authors":"Kenta Hagiwara, Kotaro Ochi, Yuya Koike","doi":"10.3769/RADIOISOTOPES.70.227","DOIUrl":null,"url":null,"abstract":"Behavior of radioactive caesium, derived from Fukushima Dai-ichi Nuclear Power Plant Accident, in river water and sediment investigated during 2012–2016. Concentrations of radioactive caesium in river water and sediment were decreased with time exponentially. The residence half-life of radioactive caesium in the river water and sediment were 0.788–1.50 year for 134Cs, 1.22–2.17 year for 137Cs. Any decrease in radioactive caesium concentration in the Tama river is because of weathering effect than radioactive decay. Concentrations of suspended radioactive caesium temporarily increased when sediments were resuspended due to rain. On the other hand, dissolved radioactive caesium is not easily impacted by this factor. Radioactive caesium concentration in sediments was considerably higher than that in river water. It indicated that much of the radioactive caesium in the Tama river existed in the sediments. Sequential extraction, elemental and crystal phase analysis were performed on the sediments and examined the chemical state of radioactive caesium as well as the adsorption mechanism. Radioactive caesium in sediment was present in a stable chemical form, and there is possibility that radioactive caesium was incorporated in biotite.","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"29 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2021-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radioisotopes","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3769/RADIOISOTOPES.70.227","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Behavior of radioactive caesium, derived from Fukushima Dai-ichi Nuclear Power Plant Accident, in river water and sediment investigated during 2012–2016. Concentrations of radioactive caesium in river water and sediment were decreased with time exponentially. The residence half-life of radioactive caesium in the river water and sediment were 0.788–1.50 year for 134Cs, 1.22–2.17 year for 137Cs. Any decrease in radioactive caesium concentration in the Tama river is because of weathering effect than radioactive decay. Concentrations of suspended radioactive caesium temporarily increased when sediments were resuspended due to rain. On the other hand, dissolved radioactive caesium is not easily impacted by this factor. Radioactive caesium concentration in sediments was considerably higher than that in river water. It indicated that much of the radioactive caesium in the Tama river existed in the sediments. Sequential extraction, elemental and crystal phase analysis were performed on the sediments and examined the chemical state of radioactive caesium as well as the adsorption mechanism. Radioactive caesium in sediment was present in a stable chemical form, and there is possibility that radioactive caesium was incorporated in biotite.

查看原文本刊更多论文

多摩河放射性铯的定点观测与特征

2012-2016年福岛第一核电站事故放射性铯在河水和沉积物中的行为研究河水和沉积物中放射性铯的浓度随时间呈指数递减。放射性铯在河水和沉积物中的停留半衰期为:134Cs为0.788 ~ 1.50 a, 137Cs为1.22 ~ 2.17 a。多摩河放射性铯浓度的任何下降都是由于风化作用而不是放射性衰变。当沉积物因降雨而重新悬浮时，悬浮放射性铯的浓度会暂时升高。另一方面，溶解的放射性铯不容易受到这个因素的影响。沉积物中的放射性铯浓度明显高于河水。这表明多摩河中的放射性铯大部分存在于沉积物中。对沉积物进行了序贯萃取、元素和晶相分析，考察了放射性铯的化学状态及其吸附机理。沉积物中的放射性铯以稳定的化学形式存在，并且有可能放射性铯被并入黑云母中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Radioisotopes

自引率

0.00%

发文量