X-ray attenuation coefficient measurement of argentine near absorption edges

Beam line 4B7A on Beijing Synchronous Radiation Facility with an energy range of 2.1 keV to 6.0 keV has an energy resolution of more than 5000, a harmonic interference of less than 0.1%, and an intensity of higher than 109 photons per second.We firstly give Ag films mass thickness by measuring its transmission in region of 2.1 keV to 6.0 keV using Henkes attenuation coefficient data. As Henkes data do not include the region of 3.4 keV to 3.9 keV, we get attenuation coefficient of Ag near absorption edges(3.4 keV to 3.9 keV) with an uncertainty of less than 1% by the mass thickness measured before and measuring X-ray transmission coefficient of the Ag film. The result could fill up the blank in attenuation coefficient in this energy range.