A high-energy resolution observed from a YAP : Ce scintillator

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 421; no. 3; pp. 610 - 613
• Main Authors: Kapusta, M., Balcerzyk, M., Moszyński, M., Pawelke, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-02-1999
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(98)01232-7

An energy resolution of 4.38±0.11% was obtained for 662
keV γ-rays with a 3×3×20
mm
3 YAP
:
Ce crystal with its long face coupled to an XP2020Q photomultiplier. The measured number of photoelectrons of 5290±80 phe/MeV implies a photoelectron statistical contribution of 4.18±0.04% and hence a YAP intrinsic energy resolution of 1.3±0.5%, the lowest value ever observed for scintillators. The relative light output of the YAP crystal measured for energies between 14.4
keV and 1.275
MeV was constant within
±2%. These observations are consistent with the assumption that there is a direct correlation between the energy resolution of scintillators and nonproportionality of their light output versus energy.