Measurement of the non-linearity in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e941" altimg="si56.svg"><mml:mi>γ</mml:mi></mml:math>-ray response of the GAGG:Ce inorganic scintillator

A characteristic of every inorganic scintillator crystal is its light yield, i.e., the amount emitted scintillation photons per unit energy deposited in crystal. Light yield known to be usually non-linear with energy, which impacts spectroscopic properties scintillator. Cerium-doped gadolinium-aluminium-gallium garnet (GAGG:Ce) a recently developed several interesting properties, make it very promising for space-based gamma-ray detectors, such as HERMES nanosatellite mission. In this paper we report an accurate measurement GAGG:Ce non-linearity 20-662 keV interval, using setup composed three samples crystals read out by Silicon Drift Detectors (SDDs).