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240Pu/239Pu signatures allow refining the chronology of radionuclide fallout in South America.
Chaboche, Pierre-Alexis; Pointurier, Fabien; Sabatier, Pierre; Foucher, Anthony; Tiecher, Tales; Minella, Jean P G; Tassano, Marcos; Hubert, Amélie; Morera, Sergio; Guédron, Stéphane; Ardois, Christophe; Boulet, Béatrice; Cossonnet, Catherine; Cabral, Pablo; Cabrera, Mirel; Chalar, Guillermo; Evrard, Olivier.
Affiliation
  • Chaboche PA; Laboratoire des Sciences du Climat et de l'Environnement (LSCE/IPSL), Unité Mixte de Recherche 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Gif-sur-Yvette, France. Electronic address: pierre-alexis.chaboche@lsce.ipsl.fr.
  • Pointurier F; CEA, DAM, DIF, F-91297 Arpajon, France.
  • Sabatier P; EDYTEM, Université Savoie-Mont Blanc, CNRS, 73370 Le Bourget du Lac, France.
  • Foucher A; Laboratoire des Sciences du Climat et de l'Environnement (LSCE/IPSL), Unité Mixte de Recherche 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Gif-sur-Yvette, France.
  • Tiecher T; Department of Soil Science, Federal University of Rio Grande do Sul, Bento Gonçalves Ave. 7712, 91540-000 Porto Alegre, RS, Brazil.
  • Minella JPG; Department of Soils, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
  • Tassano M; Laboratorio de Radioquímica, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
  • Hubert A; CEA, DAM, DIF, F-91297 Arpajon, France.
  • Morera S; Instituto Geofísico del Perú, Universidad Nacional Agraria La Molina, 15081 Lima, Peru.
  • Guédron S; Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France.
  • Ardois C; Institut de Radioprotection et de Sûreté nucléaire, Bât 501, bois des Rames, 91400 Orsay, France.
  • Boulet B; Institut de Radioprotection et de Sûreté nucléaire, Bât 501, bois des Rames, 91400 Orsay, France.
  • Cossonnet C; Institut de Radioprotection et de Sûreté nucléaire, Bât 501, bois des Rames, 91400 Orsay, France.
  • Cabral P; Laboratorio de Radioquímica, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
  • Cabrera M; Laboratorio de Radioquímica, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
  • Chalar G; Sección Limnología, Facultad de Ciencias, Universidad de la República, Uruguay.
  • Evrard O; Laboratoire des Sciences du Climat et de l'Environnement (LSCE/IPSL), Unité Mixte de Recherche 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Gif-sur-Yvette, France.
Sci Total Environ ; 843: 156943, 2022 Oct 15.
Article in En | MEDLINE | ID: mdl-35753489
Atmospheric nuclear tests (1945-1980) have led to radioactive fallout across the globe. French tests in Polynesia (1966-1974) may influence the signature of fallout in South America in addition to those conducted by USA and former USSR until 1963 in the Northern hemisphere. Here, we compiled the 240Pu/239Pu atom ratios reported for soils of South America and conducted additional measurements to examine their latitudinal distributions across this continent. Significantly lower ratio values were found in the 20-45° latitudinal band (0.04 to 0.13) compared to the rest of the continent (up to 0.20) and attributed to the contribution of the French atmospheric tests to the ultra-trace plutonium levels found in these soils. Based on sediment cores collected in lakes of Chile and Uruguay, we show the added value of measuring 240Pu/239Pu atom ratios to refine the age models of environmental archives in this region of the world.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Soil Pollutants, Radioactive / Water Pollutants, Radioactive / Radiation Monitoring / Plutonium Country/Region as subject: America do sul / Chile Language: En Journal: Sci Total Environ Year: 2022 Document type: Article Country of publication: Netherlands
Fulltext
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Soil Pollutants, Radioactive / Water Pollutants, Radioactive / Radiation Monitoring / Plutonium Country/Region as subject: America do sul / Chile Language: En Journal: Sci Total Environ Year: 2022 Document type: Article Country of publication: Netherlands