Man-made radioactivity in the Almanzora Gulch and Beach edge of Palomares, Spain.
The 239+240Pu, 238Pu and 137Cs distribution along the Almanzora Gulch and beach edge have been studied.
These areas were affected by the accident of 1966, in which a non-nuclear explosion of two thermonuclear bombs occurred.
Fluvial sediments at 0-5 cm (in 1990) and 0-10,10-20,20-30 cm depth (in 1991) were sampled.
The surface inventory (0-5 cm) of radionuclides ranges from 0.4 to 1.8 Bq. m2 of 239+240Pu and from 1 to 60 Bq. m2 of 137Cs.
The estimated total inventory (0-30 cm) shows values from 20 to 264 Bq. m-2 of 239+240Pu and from 328 to 1147 Bq. m-2 of 137Cs.
The ratio 239+240Pu/137Cs changes significantly close to the river mouth, probably due to the different behaviour of both radionuclides.
At one sampling station a contribution from the Palomares accident was noted based on the ratio 238Pu/239+240Pu.
It seems evident that until no influence from the Chernobyl accident has been detected in this area.
The granulometry of the sediments manifests the river hydrodynamics, a dry gulch with periods of floods typical of certain Mediterranean rivers.
An important input of terrigenous material containing radionuclides to the adjacent continental shelf occurs in these periods.
Mots-clés Pascal : Espagne, Césium, Plutonium, Radioactivité, Dosimétrie, Relation dose profondeur, Hydrodynamique, Sédiment, Répartition spatiale, Europe, Epidémiologie
Mots-clés Pascal anglais : Spain, Cesium, Plutonium, Radioactivity, Dosimetry, Depth dose relation, Hydrodynamics, Sediments, Spatial distribution, Europe, Epidemiology
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0219719
Code Inist : 002B30A02A. Création : 09/06/1995.