Growth and Characterization of Nanostructured Glass Ceramic Scintillators for Miniature High-Energy Radiation Sensors
Technical rept. 21 Jul 2010-30 Apr 2012
NEW MEXICO UNIV ALBUQUERQUE
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Synthesis and characterization of scintillation crystals was performed at the Los Alamos National Lab LANL. Melt quenching and sol-gel synthesis were applied to prepare various glass ceramic scintillators. For the first time ever, a glass ceramic containing 35 mol LaF3Ce3 was made. Differential scanning calorimetry, x-ray diffraction, transmission electron microscopy, nuclear magnetic resonance, photoluminescence and radioluminescence spectroscopy, and FTIRRaman spectroscopy and neutron scattering measurements were performed. Temporal dynamics was investigated by ultra-short bursts of XUV radiation at UNM. The rise time was resolved using Kerr gating technique with 8 ps resolution. Spectro-temporal dynamics was resolved using streak camera and tunable pump at secondthird harmonic 400267nm and XUV. Observed rise time scaling is consistent with chromophore trap dynamics. Rise time of 80ps in glass ceramics was measured for the first time. Varying plasma parameters as well as excitation pulse characteristics optimized XUV generation efficiency by 40 times compared to standard yield. Combined with improved collection efficiency, newly developed UNM scintillation dynamics lab is now ready for characterization of various scintillators for future material optimization.
- Ceramics, Refractories and Glass