title: The influence of particle size on radionuclide activity concentrations in Tejo River sediments.
abstract: Sediment samples from Tejo River were analyzed for (228)Ra, (226)Ra, (137)Cs and (40)K by HPGe gamma spectrometry. The activity concentration data were statistically analyzed. The activity concentrations values were in the range of about two orders of magnitude for each radionuclide. The influence of the particle size on the radionuclide concentrations was observed. The different environmental origins of the radionuclides (228)Ra, (226)Ra, (137)Cs and (40)K, in the sediments were demonstrated through correlation analysis. Cluster analysis showed a close relationship between (228)Ra and (226)Ra and a different behavior for (40)K. The data obtained in this study provides useful information on the background radioactivity of the studied area and can be further used for radiological mapping of the Tejo River.
authors.affiliation: Instituto Superior Técnico, Campus Tecnológico e Nuclear, E.N. 10 (ao km 139,7), 2695-066 Bobadela LRS, Portugal. Electronic address: madruga@ctn.ist.utl.pt.
authors.forename: M J
authors.initials: MJ
authors.lastname: Madruga
authors.affiliation: Instituto Superior Técnico, Campus Tecnológico e Nuclear, E.N. 10 (ao km 139,7), 2695-066 Bobadela LRS, Portugal.
authors.forename: L
authors.initials: L
authors.lastname: Silva
authors.affiliation: Instituto Superior Técnico, Campus Tecnológico e Nuclear, E.N. 10 (ao km 139,7), 2695-066 Bobadela LRS, Portugal.
authors.forename: A R
authors.initials: AR
authors.lastname: Gomes
authors.affiliation: Instituto Superior Técnico, Campus Tecnológico e Nuclear, E.N. 10 (ao km 139,7), 2695-066 Bobadela LRS, Portugal.
authors.forename: A
authors.initials: A
authors.lastname: Libânio
authors.affiliation: Instituto Superior Técnico, Campus Tecnológico e Nuclear, E.N. 10 (ao km 139,7), 2695-066 Bobadela LRS, Portugal.
authors.forename: M
authors.initials: M
authors.lastname: Reis
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D016000:Cluster Analysis; D005843:Geography; D019015:Geologic Sediments / Q000032:analysis; D005844:Geology; D010316:Particle Size; D011197:Potassium Radioisotopes / Q000032:analysis*; D011834:Radiation Monitoring / Q000379:methods; D011868:Radioisotopes / Q000032:analysis*; D011886:Radon / Q000032:analysis*; D045483:Rivers; D012990:Soil Pollutants, Radioactive; D013030:Spain; D013051:Spectrometry, Gamma / Q000379:methods*
chemical_list: D002588:Cesium Radioisotopes; D011197:Potassium Radioisotopes; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive; D011886:Radon
keywords: Gamma spectrometry; Particle size; Sediments; Statistical analysis; Tejo River