Non-proportional response between 0.1-100keV energy by means of highly monochromatic synchrotron X-rays

TL;DR

This study uses monochromatic synchrotron X-rays to accurately measure the non-proportional response of certain scintillators across a wide energy range, introducing a new method called K-dip spectroscopy for low-energy response reconstruction.

Contribution

It presents a novel approach using highly monochromatic X-rays and escape peak analysis to determine scintillator response curves down to very low energies, including a new K-dip spectroscopy method.

Findings

Response curves extend down to a few keV using escape peaks.

K-dip spectroscopy enables response reconstruction down to 100 eV.

Non-proportional response varies significantly near the K-edge.

Abstract

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.