Scintillation properties of K2LaCl5 with Ce doping |
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Authors: | J C Van't Spijker P Dorenbos J T M De Haas C W E Van Eijk H U Güdel K Krmer |
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Institution: | a Delft University of Technology, Faculty of Applied Physics, c/o IRI, Mekelweg 15, 2629 JB, Delft, The Netherlands b Institut für Anorganische Chemie der Universität Bern, Freiestrasse 3, 3000, Bern 9, Switzerland |
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Abstract: | In this work we present the scintillation properties of K2LaCl5 doped with Ce3+ concentrations of 0, 0.1, 1 and 10%. Under X-ray excitation the crystals show the efficient Ce3+ (5d–4f) luminescence between 340 and 400 nm. Depending on the Ce concentration, the light yields vary between 24,000 and 50,000 photons/MeV (ph/MeV). Experiments with 662 KeV gamma ray excitation show light yields varying between 13,000 and 30,000 ph/MeV. For Ce luminescence a single exponential decay time of approximately 40 ns is expected. However, for K2LaCl5:10%Ce, the decay is not single exponential. As a function of the time t, it can be described by a 1/t1.63 behaviour for large t. With a crystal of K2LaCl5:10%Ce we obtained an energy resolution of 5.1% for 662 KeV gamma ray excitation of 137Cs. |
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