Polychromatic X-Ray Attenuation Characteristics and Wood Densitometry Applications

M. L. Hoag, R. L. Krahmer


The use of polychromatic X-ray energy in wood densitometry complicates the mathematical relationship between the material and X-ray attenuation. Attenuation of polychromatic X-ray energy through cellulose acetate was investigated and characterized. Under polychromatic radiation with 30 keV maximum photon energy, an attenuation coefficient of 0.638 cm2/g was determined for samples of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) from two trees at 9% equilibrium moisture content. X-ray energy was sensitive to wood moisture content within a 2% range.


Polychromatic X-ray;attenuation;cellulose acetate;wood density;moisture content

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