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High-energy-resolution scintillator: Ce3+ activated LaBr3

✍ Scribed by van Loef, E. V. D.; Dorenbos, P.; van Eijk, C. W. E.; Kramer, K.; Gudel, H. U.

Book ID
118151409
Publisher
American Institute of Physics
Year
2001
Tongue
English
Weight
350 KB
Volume
79
Category
Article
ISSN
0003-6951

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✦ Synopsis

The scintillation properties of LaBr3 doped with 0.5%β€ŠCe3+ are presented. Under optical and gamma ray excitation, Ce3+ emission is observed to peak at 356 and 387 nm. The scintillation light output is 61β€Š000Β±5000 photons/MeV at 662 keV. More than 90% is emitted with a decay time of 35 ns. An energy resolution (full width at half maximum over the peak position) of 2.85%Β±0.05% was observed for the 662 keV full absorption peak. A time resolution of 385 ps was obtained using BaF2 as second scintillator and gamma rays of Co60.

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Using highly monochromatic synchrotron X-rays in the energy range from 10.5 to 100 keV, the temperature dependence of the photon nonproportional response and energy resolution of LaBr 3 scintillators doped with 5% Ce 3 ΓΎ were studied at 80, 295, and 450 K. Improvement of the proportionality and bett