Title :
Performance improvement of large Sr2+ and Ba2+ co-doped LaBr3:Ce3+ scintillation crystals
Author :
Kan Yang ; Menge, P.R. ; Buzniak, Jan J. ; Ouspenski, Vladimir
Author_Institution :
St.-Gobain Crystals, Hiram, OH, USA
fDate :
Oct. 27 2012-Nov. 3 2012
Abstract :
The performance improvement of large size (φ = 60 mm, ℓ = 80 mm) Sr2+ and Br2+ co-doped LaBr3:Ce3+ scintillation crystals is reported. The scintillation light output of both Sr2+ and Br2+ co-doped crystals are significantly improved. Compared to 70,000 ph/MeV (at 662 keV) for Ce3+ only LaBr3, Sr2+ and Ba2+ co-doping increase the light output by ~25% to 88,000 ph/MeV and 89,000 ph/MeV, respectively. The energy resolutions of both Sr2+ and Ba2+ co-doped crystals are improved over a wide energy range as well. The scintillation decay time is slightly lengthened with co-doping. No secondary slow component is observed. Co-doped crystals exhibit very similar emission and excitation characteristics to the Ce3+ only crystal. Both Sr2+ and Ba2+ show improved light output proportionality in the low energy range.
Keywords :
barium; cerium; crystal structure; doping; excited states; lanthanum compounds; scintillation; strontium; Ba2+ codoped LaBr3:Ce3+ scintillation crystals; LaBr3:Ce3+; LaBr3:Ce3+,Ba2+; LaBr3:Ce3+,Sr2+; Sr2+ codoped LaBr3:Ce3+ scintillation crystals; emission characteristics; energy resolutions; excitation characteristics; light output improvement; scintillation decay time; scintillation light output; secondary slow component;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-2028-3
DOI :
10.1109/NSSMIC.2012.6551113