240Pu/239Pu signatures allow refining the chronology of radionuclide fallout in South America

被引：9

作者：

Chaboche, Pierre-Alexis ^{[1
]}

Pointurier, Fabien ^{[2
]}

Sabatier, Pierre ^{[3
]}

Foucher, Anthony ^{[1
]}

Tiecher, Tales ^{[4
]}

Minella, Jean P. G. ^{[5
]}

Tassano, Marcos ^{[6
]}

Hubert, Amelie ^{[2
]}

Morera, Sergio ^{[7
]}

Guedron, Stephane ^{[8
]}

Ardois, Christophe ^{[9
]}

Boulet, Beatrice ^{[9
]}

Cossonnet, Catherine ^{[9
]}

Cabral, Pablo ^{[6
]}

Cabrera, Mirel ^{[6
]}

Chalar, Guillermo ^{[10
]}

Evrard, Olivier ^{[1
]}

机构：

[1] Univ Paris Saclay, Unite Mixte Rech 8212 CEA CNRS UVSQ, Lab Sci Climat & Environm LSCE IPSL, Gif Sur Yvette, France

[2] CEA, DAM, DIF, F-91297 Arpajon, France

[3] Univ Savoie Mt Blanc, CNRS, EDYTEM, F-73370 Le Bourget Du Lac, France

[4] Univ Fed Rio Grande do Sul, Dept Soil Sci, Bento Goncalves Ave 7712, BR-91540000 Porto Alegre, RS, Brazil

[5] Univ Fed Santa Maria, Dept Soils, BR-97105900 Santa Maria, RS, Brazil

[6] Univ La Republ, Fac Ciencias, Ctr Invest Nucl, Lab Radioquim, Montevideo, Uruguay

[7] Univ Nacl Agr La Molina, Inst Geofis Peru, Lima 15081, Peru

[8] Univ Grenoble Alpes, Univ Savoie Mt Blanc, CNRS, IRD,IFSTTAR,ISTerre, F-38000 Grenoble, France

[9] Inst Radioprotect & Surete Nucl, Bat 501, F-91400 Orsay, France

[10] Univ La Republ, Fac Ciencias, Secc Limnol, Montevideo, Uruguay

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2022年 / 843卷

关键词：

Plutonium isotopes; Nuclear weapon tests; Geochronology; Soil erosion; PU-240/PU-239; ISOTOPIC-RATIOS; SETTING LAKES PUYEHUE; DATING PB-210; PLUTONIUM; PU239+240; SEDIMENTS; SOILS; ICALMA; AM-241; CS-137;

D O I：

10.1016/j.scitotenv.2022.156943

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 degrees 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.

引用

页数：11

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