Scientific paper

Direct Gamma Ray Densitometry of Wood

Published in: South African Forestry Journal
Volume 157, issue 1, 1991 , pages: 1–6
DOI: 10.1080/00382167.1991.9629091
Author(s): F.S. MalanDepartment of Wood Science,, P.G. MaraisDepartment of Food Science,


Wood density was determined in various wood species representing a wide range of densities using 60 KeV collimated soft gamma radiation from an Americium241 energy source. In the samples examined wood mass attenuation coefficients varied from 0,170 to 0,210 cm2g among wood specimens due mainly to differences in moisture, extractive and ash contents, differences in chemical compositions of the wood itself, and the presence of varying amounts of heavy metals. On average the mass attenuation coefficients for air-dry and oven-dry wood were 0,185 cm2/g and 0,180 cm2/g respectively. These results compare well with those found by other research workers.

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