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Dicussion of Sediment Density Measurement by X-Radiography and Gamma Ray Attenuation
Reeves, Rachael
Reeves, Rachael
Abstract
Sediment density is a basic property used for the description of sediment and is important in understanding sediment properties, transport, acoustics, etc. (Rose et. al., 1971) At VIMS, sediment density is being studied as a constraint on sediment and seafloor erodability as part of the Multidisciplinary Benthic Exchange’: Dynamics (MUDBED) project funded by the National Science Foundation. (Dickhudt, 2008) As part of this project, x-radiography techniques have been used to visualize layers of density within shallow sediment cores. However, these density profiles show only relative densities within the core and do not reveal actual density values. Instead, true density values must be calculated using water content. This method is time and energy consuming, and a faster, more efficient method has been sought. By comparing the pixel values of digital x-radiograph images and gamma ray attenuation values from a core logger to bulk density values calculated by water content, this study determines the relationship between these three techniques and challenges the idea that water content calculations are the most effective and efficient technique for the determination of sediment density.
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2010-01-01
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Geology