Plutonium from Global Fallout Recorded in an Ice Core from the Belukha Glacier, Siberian Altai

Ice cores from glaciers situated near anthropogenic sources of air pollution provide important archives of the emissions of species with short atmospheric lifetimes. Here we present the history of atmospheric Pu fallout reconstructed from an ice core from the Belukha glacier in the Siberian Altai. F...

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Bibliographic Details
Published in:Environmental Science & Technology
Main Authors: Olivier, S, Bajo, Sixto, Fifield, L Keith, Gaggeler, H W, Papina, Tatyana, Santschi, P, Schotterer, U, Schwikowski, Margit, Wacker, L.
Format: Article in Journal/Newspaper
Language:unknown
Published: American Chemical Society
Subjects:
Keywords: Air pollution
Glaciers
Ice
Mass spectrometry
Ordnance
Particulate emissions
Troposphere
Upper atmosphere
Global fallout
Ice core
Nuclear weapons
Postmoratorium testing
Plutonium
atmospheric deposition
fallout
ice core
Online Access:http://hdl.handle.net/1885/86369
https://doi.org/10.1021/es0492900
https://openresearch-repository.anu.edu.au/bitstream/1885/86369/5/MigratedxPub15232_2004.pdf.jpg
https://openresearch-repository.anu.edu.au/bitstream/1885/86369/7/01_Olivier_Plutonium_from_Global_Fallout_2004.pdf.jpg
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Summary:Ice cores from glaciers situated near anthropogenic sources of air pollution provide important archives of the emissions of species with short atmospheric lifetimes. Here we present the history of atmospheric Pu fallout reconstructed from an ice core from the Belukha glacier in the Siberian Altai. Fourteen ice core samples covering the time period 1941-1986 were selected for Pu analysis, chemically processed, and measured using accelerator mass spectrometry. The Pu concentration peaks in 1963, coinciding with the maximum of the nuclear weapons tests and in concordance with the3H activity concentration peak. The shapes of the239Pu and3H profiles reflect two main periods of atmospheric nuclear test activity: premoratorium testing before 1958 and postmoratorium testing in 1961 and 1962. Premoratorium tests contribute about 45% of the integrated Pu inventory. The average240Pu/239Pu isotopic ratio is 0.18 ± 0.05, indicating that a large majority of the Pu in the Belukha glacier originates from global stratospheric fallout rather than from direct tropospheric input.

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