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(Top frame) Beta-excited radioluminescence spectra acquired of ; (inset) crystal grown at RMD under excitation. (Lower frame) Beta-excited radioluminescence from three crystals; (inset) crystal from Fisk University under excitation. For , the first crystal was grown from as-received powders (red), the second crystal was grown from powders that had been zone refined once (black), and the third crystal was grown under ultrapure conditions. Light yields are plotted along with that of CsI(Tl) (green), and may be compared in an absolute sense.
Time-resolved luminescence decays acquired by excitation with laser pulses at . emission recorded at for emission and at for “impurity recombination” band.
Postulated energy level diagram for the and systems.
Pulse-height spectra acquired of a crystal grown at RMD (upper frame), yielding an energy resolution of 3.7% at , and of the second crystal of (lower frame), yielding an energy resolution at of 8.1%.
Pulse-height spectra provide the energy resolution as a function of gamma ray energy. Energy resolution is comparable between and for all energies.
Relative light yields as a function of electron energy acquired using the SLYNCI reveal a proportional response for , in comparison to both and NaI(Tl).
Beta-excited light yields are acquired with a silicon CCD camera that integrates the luminescence spectrum over ; spectral sensitivity corrected for CCD and grating. Gamma-excited light yields are determined via pulse-height spectra, corrected for spectral sensitivity, and acquired at using a Hamamatsu R980 PMT ( shaping time).
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