In-situ radionuclide characterization of a submarine groundwater discharge site at Kalogria Bay, Stoupa, Greece

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• 作者：Christos Tsabaris^a ; ^{tsabaris@hcmr.gr} ; Dionisis L. Patiris^a ; Aristomenis P. Karageorgis^a ; George Eleftheriou^b ; Vassilis P. Papadopoulos^a ; Dimitris Georgopoulos^a ; Evangelos Papathanassiou^a ; Pavel P. Povinec^c
• 关键词：Marine environment ; Submarine groundwater discharge ; Radon ; Thoron ; In-situ gamma-ray spectrometry ; Kalogria Bay
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：June, 2012
• 卷：108
• 期：Complete
• 页码：50-59
• 文件大小：1546 K

摘要

In-situ underwater gamma-ray spectrometer KATERINA was used for continuous measurements of radon progenies (²¹⁴Pb, ²¹⁴Bi), thoron progeny (²⁰⁸Tl) and ⁴⁰K in submarine groundwater discharge (SGD) sites at Kalogria Bay, SW Peloponnesus (Greece). The spectrometer was deployed attached on measuring platform along with two conductivity - temperature data loggers while underwater battery packs supplied the system for acquisition periods up to 25 days. The radionuclide time series together with salinity data were obtained for spring (wet) and summer (dry) seasons. The ⁴⁰K activity concentrations correlated well with salinity of the emanating groundwater. Although the ²¹⁴Bi and ²⁰⁸Tl activities showed usually similar trends anticorrelating with salinity, in some cases ²⁰⁸Tl did not follow the ²¹⁴Bi record due to changes in the dynamics of the groundwater aquifer. As the half-life of ²²⁰Rn is very short (55.6聽s), its concentration in SGD may depend on the distance from its origin to the monitoring point. The observed temporal variations of ²¹⁴Bi and ²⁰⁸Tl confirmed advantages of continuous in-situ monitoring of SGD in coastal areas.