In-Situ Radiocarbon Production by Neutrons and Muons in an Antarctic Blue Ice Field at Scharffenbergbotnen: A Status Report
Issue Date
2001-01-01Keywords
blue iceScharffenbergbotnen ice field
progress report
ice fields
ablation
report
Antarctica
lower Holocene
muons
accelerator mass spectraice sheetsice coresneutronsconcentrationin situmass spectraspectraHoloceneglacial geologyPleistoceneupper PleistoceneCenozoicQuaternaryC 14carbondatesisotopesradioactive isotopescarbon dioxideabsolute agegeochemistry
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van der Borg, K., van der Kemp, W. J. M., Alderliesten, C., de Jong, A. F. M., Lamers, R. A. N., Oerlemans, J., ... & van de Wal, R. S. W. (2001). In-situ radiocarbon production by neutrons and muons in an Antarctic blue ice field at Scharffenbergbotnen: A status report. Radiocarbon, 43(2B), 751-757.Journal
RadiocarbonDescription
From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.Additional Links
http://radiocarbon.webhost.uits.arizona.edu/Abstract
In the radiocarbon accelerator mass spectrometry (14C AMS) analysis of gases obtained in a dry extraction from a 52-m Antarctic ice core, we observed 14CO2 and 14CO concentrations decreasing with depth. The concentrations are explained in terms of in-situ production by neutrons and captured muons in ablating ice. The ratio of the 14CO2 concentration to that of 14CO has been found to be constant at 1.9 +/0.3. The ablation rates obtained of 42 +/18 cm.yr-1 and 40 +/13 cm.yr-1 for the neutron and muon components, respectively, are about three times higher than observed from stake readings. The discrepancy may point to an incomplete extraction of the dry extraction method. Using the constant ratio in 14CO2 and 14CO concentrations we correct for the in-situ component in the trapped 14CO2 and deduce an age of 10,300 +/900 BP for the ice core.Type
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