Title :
Low energy γ-rays scintillation detection with large area avalanche photodiodes
Author :
Moszynski, M. ; Kapusta, M. ; Zalipska, J. ; Balcerzyk, M. ; Wolski, D. ; Szawlowski, M. ; Klamra, W.
Author_Institution :
Soltan Inst. for Nucl. Studies, Warsaw, Poland
fDate :
8/1/1999 12:00:00 AM
Abstract :
Energy resolution of NaI(Tl), CsI(Tl), LSO and YAP crystals coupled to 16 mm diameter Large Area Avalanche Photodiodes (LAAPD) was studied for low energy γ-rays. Energy resolutions of 11.3% and 8.4% were obtained for 59.6 keV γ-rays from 241Am and 122 keV γ-rays from 57Co sources, respectively, as measured with a 10 mm diameter by 10 mm high NaI(Tl) crystal. The optimization of the LAAPD performance is presented, being essential for improvement of energy resolution at low energy γ-rays. Measured numbers of primary electron-hole pairs produced in LAAPDs and evaluation of noise contribution of these devices allowed for quantitative discussion of the results. Particularly, the intrinsic energy resolution of the crystals vs. energy of γ-rays has been evaluated. Obtained data for NaI(Tl) crystal showed a good agreement (within 30%) with calculated component due to nonproportional light yield for energies above 50 keV
Keywords :
avalanche photodiodes; caesium compounds; gamma-ray detection; lutetium compounds; sodium compounds; solid scintillation detectors; thallium; yttrium compounds; CsI(Tl); CsI:Tl; LSO; Lu2SiO4:Ce; NaI(Tl); NaI:Tl; YAP; YAlO3; energy resolution; intrinsic energy resolution; large area avalanche photodiodes; low energy gamma-rays scintillation detection; primary electron-hole pairs; Avalanche photodiodes; Crystals; Energy measurement; Energy resolution; Gamma ray detection; Gamma ray detectors; IEEE members; Noise measurement; Solid scintillation detectors; Testing;
Journal_Title :
Nuclear Science, IEEE Transactions on
