Measured Attenuation Coefficients at Low Photon Energies (9.88-59.32 keV) for 44 Materials and Tissues

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Abstract
Narrow-beam linear attenuation coefficients for 6 important human tissues were measured using low-energy photon radiation in the range 9.88-59.32 keV, and at 9.88 and 17.44 keV, for 38 materials employed in radiation physics. The accuracy of dosimetric measurements using substitute materials to simulate body tissues and air was assessed. The measuring technique utilized a collimated beam of fluorescent X-rays, a high-resolution Li-drifted Ge detector and a multichannel analyzer. Attenuation coefficients calculated for published elemental compositions using photon interaction and a polynomial fitting routine were compared. Good agreement was usually obtained between measured and calculated data for the basic and substitute materials. Inhomogeneities in certain human tissues produced large discrepancies.

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