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5. J.H.Hubbell, S.M.Seltzer Tables of X-ray mass attenuation coefficients and mass energy-absorption coefficients from 1 keV to 20 MeV for elements Z =1 to 92 and 48 additional substances of dosimetric interest: 〈http://www.nist.gov/pml/data/xraycoef/index.cfm〉