Energy Transfer, Fluorescence and Scintillation Processes in Cerium-Doped RE3+ AlO3 Fast Scintillators |
| J.A. Mares and M. Nikl Institute of Physics, Czech Academy of Sciences, Cukrovarnicka 10, 16200 Prague 6, Czech Republic |
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| Modern applications of scintillators in medical imaging of human body (Positron Emission Tomography - PET scanning, γ-cameras and other X-ray tomographies) require improved or even quite new scintillators which should be characterized by (i) fast response, (ii) high density and (iii) high light yield. At present time new scintillating crystals are investigated, mainly those having perovskite lattice structure of the formula RE3+ AlO3:Ce where RE 3+ = Y3+, Gd3+ and Lu3+. Here, we will present the newest data with summarising properties of these types of scintillators including the mixed ones. Energy transfer processes between Ce3+ main centres and Ce3+ multisites are discussed together with their mechanisms including processes between Ce 3+ and Gd3+ ions. Finally, the characteristic properties of scintillating crystals based on perovskite structure are reviewed. |
| DOI: 10.12693/APhysPolA.90.45 PACS numbers: 78.55.-m, 78.60.-b |