Abstract
Cosmic-ray produced 7Be (53 days half-life) is directly measurable in freshly collected samples of river and coastal zone sediments using a lithium-drifted germanium detector. Calibration of the detector is discussed and an assessment of overall accuracy and sensitivity presented. The detection limit for a 250-g dry weight sediment sample contained in a Marinelli Beaker and counted for 200 minutes is approximately 0.4 pCi/g. Applications toward locating zones of rapid sedimentation as well as in understanding shallow-water sedimentation dynamics are suggested.
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