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Title: Concentrations and activity ratios of uranium isotopes in groundwater from Donana National Park, South of Spain

The levels and distribution of natural radionuclides in groundwaters from the unconfined Almonte-Marismas aquifer, upon which Donana National Park is located, have been analysed. Most sampled points were multiple piezometers trying to study the vertical distribution of the hydrogeochemical characteristics in the aquifer. Temperature, pH, electrical conductivity, dissolved oxygen and redox potential were determined in the field. A large number of parameters, physico-chemical properties, major and minor ions, trace elements and natural radionuclides (U-isotopes, Th-isotopes, Ra-isotopes and {sup 210}Po), were also analysed. In the southern zone, where aeolian sands crop out, water composition is of the sodium chloride type, and the lower U-isotopes concentrations have been obtained. As water circulates through the aquifer, bicarbonate and calcium concentrations increase slightly, and higher radionuclides concentrations were measured. Finally, we have demonstrated that {sup 234}U/{sup 238}U activity ratios can be used as markers of the type of groundwater and bedrock, as it has been the case for old waters with marine origin confined by a marsh in the south-east part of aquifer.
Authors:
; ;  [1] ;  [2]
  1. Department of Applied Physics, University of Huelva, Campus de El Carmen, 21071-Huelva (Spain)
  2. Department of Applied Physics II, University of Sevilla, ETSA Arquitectura, 41012-Sevilla (Spain)
Publication Date:
OSTI Identifier:
21152444
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1034; Journal Issue: 1; Conference: NRE-VIII: 8. International symposium on the natural radiation environment, Buzios, RJ (Brazil), 7-12 Oct 2007; Other Information: DOI: 10.1063/1.2991212; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACID CARBONATES; AQUIFERS; CALCIUM; CHEMICAL PROPERTIES; DISSOLVED GASES; ELECTRIC CONDUCTIVITY; GROUND WATER; HYDROLOGY; OXYGEN; PH VALUE; POLONIUM 210; RADIOACTIVITY; RADIUM ISOTOPES; REDOX POTENTIAL; SPAIN; THORIUM ISOTOPES; TRACE AMOUNTS; URANIUM 234; URANIUM 238