Non-proportional response between 0.1-100keV energy by means of highly   monochromatic synchrotron X-rays
  Using highly monochromatic X-ray synchrotron irradiation ranging from 9 keV to 100 keV, accurate Lu2SiO5:Ce3+,Ca (LSO), Lu3Al5O12:Pr3+ (LuAG), Lu2Si2O7:Ce3+ (LPS) and Gd2SiO5:Ce3+ (GSO) non-proportional response curves were determined. By utilizing information from escape peaks in pulse height spectra the response curve can be extended down to several keV. A detailed study of the non-proportionality just above the K-edge is presented and from that a method, which we named K-dip spectroscopy, is obtained to reconstruct the electron response curve down to energies as low as 100 eV. 
Ivan V. Khodyuk, Johan T. M. de Haas, and Pieter Dorenbos
cond-mat.mtrl-sci nucl-ex physics.ins-det