1. 1) NIST Physical Measurements Laboratory : Bibliography of Photon Total Cross Section (Attenuation Coefficient) Measurements; https://www.nist.gov/pml/bibliography-photon-total-cross-section-attenuation-coefficient-measurements
2. 2) NIST Physical Measurements Laboratory : X-Ray Mass Attenuation Coefficients; https://www.nist.gov/pml/x-ray-mass-attenuation-coefficients
3. 3) Center for X-Ray Optics, Lawrence Berkeley National Laboratory : X-Ray Interactions with Matter; http://henke.lbl.gov/optical_constants/
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