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γ-Ray Spectrometric and α-Counting Method Comparison for the Determination of Pb-210 in Estuarine Sediments

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Abstract:

An intercomparison of methodology and of dating results, from α-counting and from the more recent γ-spectrometry method, has been made for marine sediment cores from several locations. The former method involves considerable chemical manipulation, whereas the latter is more straight forward and enables direct interpretation of the results. Similar precisions (~ 12%) were found for both methods. With the constant flux model, the methods gave calculated sedimentation rates between 4.3 and 7.8 cm a-1 for replicate cores near a ferry pier in Hong Kong Harbor. The γ-spectrometry method is thus a reliable, more rapid method for routine monitoring and investigation of the harbor dynamics and history of pollution.

Keywords: ALPHA SPECTROMETRY; ANALYTICAL METHODS; GAMMA-RAY SPECTROMETRY; MARINE SEDIMENT POLLUTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702001948574

Affiliations: 1: Centre for Coastal Pollution and Conservation, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China. 2: State Pilot Laboratory of Coast and Island Exploitation, Nanjing University, Nanjing 210093, China.

Publication date: October 1, 2000

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