“…Bragg-Pierce law measures the attenuation coefficient for the photoelectric absorption of a homogeneous piece of elemental matter as a function of X-ray photon energy (E) and atomic number (Z), 69 𝜏 = 𝑘 𝑍 3 𝐸 3 The fluorescent yield is the ratio of incoming X-ray and X-ray fluorescence emitted, and from Lambert Beer law, 70,71 𝜔 = 𝑍 4 𝐴 + 𝑍 4 where A is a constant dependent on the line of X-ray fluorescence, having value range from 10 4 to 10 8 for emission from different lines, which is an empirical fitting. Elements with higher atomic number shows higher fluorescent yield.…”