226Ra contents and 228Ra/226Ra activity ratios of the Fenland rivers and The Wash, eastern England; spatial and seasonal trends

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doi: 10.1016/0009-2541(94)00109-L
Authors:Plater, A. J.; Ivanovich, M.; Dugdale, R. E.
Author Affiliations:Primary:
University of Liverpool, Department of Geography, Liverpool, United Kingdom
Other:
Harwell Laboratory, United Kingdom
University of Nottingham, Nottingham, United Kingdom
Volume Title:Chemical Geology
Source:Chemical Geology, 119(1-4), p.275-292. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1995
Note:In English. 53 refs.; illus., incl. 6 tables, sketch map
Summary:Measurements of 226Ra and 228Ra in the Fenland rivers and The Wash show that physical and hydrological factors play an important role in controlling the transport and fate of radium isotopes. In the surficial environment, higher 226Ra contents and lower 228Ra/226Ra activity ratios are found in waters from catchments with a greater proportion of carbonate-rich source materials. This relationship is more obvious during periods of high runoff and river discharge when enhanced surficial weathering and regolith saturation takes place. In the nearshore zone, 226Ra content is relatively uniform whilst 228Ra/226Ra activity ratio is controlled by ionic concentrations (Cl, SO4 and CO3) and the acquisition of "marine" characteristics. The observed 228Ra/226Ra activity ratio trend can be attributed to a combination of conservative mixing and radium desorption from suspended sediments, whilst more uniform 226Ra contents may reflect bottom sediment diffusion of excess 226Ra over a greater area. The relative importance of these two processes is controlled by differential input from the freshwater and saline end-members of the estuary.
Subjects:Alkaline earth metals; Estuarine environment; Fluvial environment; Fresh-water environment; Geochemistry; Hydrochemistry; Hydrology; Isotope ratios; Isotopes; Metals; Nearshore environment; Ra-226; Ra-228/Ra-226; Radioactive isotopes; Radium; Rivers and streams; Sea water; Seasonal variations; Spatial variations; Surface water; Weathering; Atlantic Ocean; Cambridgeshire England; East Anglia; England; Europe; Great Britain; Lincolnshire England; Norfolk England; North Atlantic; North Sea; United Kingdom; Western Europe; Fenland England; The Fens; The Wash
Coordinates:N523000 N531500 E0010000 W0001500
Abstract Numbers:95M/4532
Record ID:1995025445
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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