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Effects of Calcium Codoping on Charge Traps in LSO:Ce Crystals

Kan YangScintillation Materials Research Center, Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, USACharles L. MelcherScintillation Materials Research Center, Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, USAPhilip D. RackDepartment of Materials Science and Engineering, University of Tennessee, Knoxville, TN, USALars A. ErikssonClinical Neuroscience Division, Karolinska Institute, Stockholm, Sweden

2009en

ABI

Annotatsiya

Experimental studies of Lu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> :Ce (LSO:Ce) crystals codoped with various concentrations of Ca (0, 0.1, 0.2, 0.3, and 0.4 at% in the melt) are presented. The scintillation and optical properties including photoluminescence decay, emission, excitation, absorption, afterglow and thermoluminescence properties are investigated as a function of Ca concentration. Experimental data show Ca codoping significantly reduces the trapped charge population in the crystal matrix. Hence, the scintillation decay time of LSO:Ce is shortened and the afterglow is suppressed. Thermoluminescence studies show a strong correlation between the integrated thermoluminescence intensity and the Ca concentration.

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DOI: 10.1109/tns.2009.2027018

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