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Application of self-absorption correction method in gamma spectroscopy for 210Pb and 137Cs sediment chronology on the continental slope off NW Africa

Published online by Cambridge University Press:  06 June 2009

J. Barescut ,
D. Pittauerov ,
S. Mulitza ,
B. Hettwig ,
W. Chehade ,
J.-B. Stuut ,
G. Mollenhauer  and
H. W. Fischer
D. Pittauerov
Affiliation:
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
S. Mulitza
Affiliation:
MARUM, University of Bremen, 28359 Bremen, Germany
B. Hettwig
Affiliation:
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
W. Chehade
Affiliation:
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
J.-B. Stuut
Affiliation:
MARUM, University of Bremen, 28359 Bremen, Germany
G. Mollenhauer
Affiliation:
MARUM, University of Bremen, 28359 Bremen, Germany
H. W. Fischer
Affiliation:
Institute of Environmental Physics, University of Bremen, 28334 Bremen, Germany
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Abstract

The uppermost 50 cm of the high resolution core GeoB9501-4 from the continental slope off NW Africa has been used for improving routine technique of 210Pb and 137Cs sediment chronology in the Radioactivity measurement laboratory of the Bremen University. The experimental requirements for 210Pb and 137Cs determination were non-destructive analysis of wet sediment samples in cylindrical containers with different heights, unknown elemental composition and density. The method used in this study to deal with self attenuation is applying efficiencies calculated using the LabSOCSTM, Genie 2000 software calibration tool, validated by self-absorption test measurements of different materials with known composition. A mean sedimentation rate of 0.49 cm ⋅ yr-1 was obtained from the investigated core using the CRS chronological model. This means a relatively increased recent sedimentation rate comparing to an average sedimentation rate at higher depths of an associated gravity core estimated to 0.15 cm ⋅ yr-1 by 14C chronology. A further increase of the sedimentation rate was observed in the uppermost part of the studied core (up to 0.90 cm ⋅ yr-1).

Type
Research Article
Information
Radioprotection , Volume 44 , Issue 5: ECORAD 2008 - Radioecology and Environmental Radioactivity , 2009 , pp. 457 - 461
Copyright
© EDP Sciences, 2009

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