Nonproportional Response Between 0.1–100 keV Energy by Means of Highly Monochromatic Synchrotron X-Rays

Using highly monochromatic X-ray synchrotron radiation ranging from 9 keV to 100 keV, accurate Lu
₂
Si
₂
O
₇
:Ce
³⁺
,Ca (LSO), Lu
₃
Al
₅
O:Pr
³⁺
(LuAG), Lu
₂
Si
₂
O
₅
:Ce
³⁺
(LPS) and Gd
₂
SiO
₅
:Ce
³⁺
(GSO) nonproportional 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 nonproportionality just above the if-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.