Legacy radionuclides in cryoconite and proglacial sediment on Orwell Glacier, Signy Island, Antarctica

Legacy radionuclides in cryoconite and proglacial sediment on Orwell Glacier, Signy Island, Antarctica

Cryoconite is a specific type of material found on the surface of glaciers and icesheets. Samples of cryoconite were collected from the Orwell Glacier and its moraines, together with suspended sediment from the proglacial stream on Signy Island, part of the South Orkney Islands, Antarctica. The acti...

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Veröffentlicht in:Journal of environmental radioactivity 2023-08, Vol.264, p.107206-107206, Article 107206
Hauptverfasser: Owens, Philip N., Stott, Tim A., Blake, Will H., Millward, Geoffrey E.
Format: Artikel
Sprache:eng
Schlagworte:
137Cs
Fallout radionuclides
Glacial retreat
Legacy contaminants
Unsupported 210Pb
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Beschreibung
Zusammenfassung:Cryoconite is a specific type of material found on the surface of glaciers and icesheets. Samples of cryoconite were collected from the Orwell Glacier and its moraines, together with suspended sediment from the proglacial stream on Signy Island, part of the South Orkney Islands, Antarctica. The activity concentrations of certain fallout radionuclides were determined in the cryoconite, moraine and suspended sediment, in addition to particle size composition and %C and %N. For cryoconite samples (n = 5), mean activity concentrations (±1SD) of 137Cs, 210Pbun and 241Am were 13.2 ± 20.9, 66.1 ± 94.0 and 0.32 ± 0.64 Bq kg−1, respectively. Equivalent values for the moraine samples (n = 7) were 2.56 ± 2.75, 14.78 ± 12.44 and
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2023.107206