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Figure 3: Activities of210Pbtot, 210Pbex and 214Bi plotted against compaction-corrected depth. On the plots on
the right the 210Pbex activities are presented on a logarithmical scale.
(2)
The activities of 21OPbtot , 2lOpw and 214Bi are plotted against compaction-corrected depth in
Figures 3 and 4. The right diagrams show the profiles of the 210Pbex activities on a
logarithrnical scale. The mean accumulation rate (R) and sedimentation rate (S) can be calculated
from the slope of the best exponential fit to 210Pex as:
S = R / P
(5)
where:
G :
compaction corrected depth [g cm- 2 ]
210Pb ex (O) : 2lOPb ex activity at the surface