210Pb and 137Cs activities were determined in sediment cores from Lakes Matagami and Quevillon, northwest Quebec, Canada. Following correction for the compressive effect of sedimenting materials, present-day sedimentation rates have been calculated from the excess 210Pb profiles. The rates are found to be 0.81 mm∙year−1 (59 mg∙cm−2 ∙year−1) and 0.52 mm∙year−1 (35 mg∙cm−2∙year−1) in Lake Matagami and Lake Quevillon, respectively. 137Cs measurements are in accord with these values.

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