Abstract
We have studied the possibility of using BaF 2 and LaF 3 doped with Nd 3+, concentrations ranging from 0.1 to 15 mol% as efficient converters of 511 keV gamma rays. We have measured the number of photoelectrons/MeV for both crystals using a parallel-plate avalanche chamber operating with a CsI photocathode. The photocathode is sensitive to wavelengths in the range 160–220 nm. The fast component of the BaF 2 emission spectrum has peaks at roughly 175, 195 and 200 nm, and the LaF 3:Nd 3+ emission spectrum peaks at 173 nm. We measure 3.71 ± 0.04 ± 1.11 photoelectrons/MeV for the BaF 2 and 4.81 ± 0.04 ± 1.44 photoelectrons/MeV for the LaF 3:Nd 3−. The results for BaF 2 and LaF 3:Nd 3+ are consistent with measured scintillation properties of these crystals and CsI photocathode quantum efficiencies.
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