Size effects on the properties of high z scintillator materials

摘要

Particle size effects of nano- and polycrystalline metal tungstate MWO4 (M = Ca, Pb, Cd) scintillators were examinedthrough a comparison of commercially available powders and solution precipitation prepared nanoscaled materials. Thescintillation behaviors of nanoparticles and commercial powders were examined with ion beam induced luminescence(IBIL), photoluminescence (PL), and cathodoluminescence (CL) spectroscopy techniques. For commercial micronssized MWO4 powders, spectral emission differences between CL and PL were only observed for Cd and Pb tungstateswhen compared to reported single crystals. The IBIL wavelength emissions also differed from the commercial MWO4CL and PL data and were red shifted by 28 and 14 nm for CaWO4 and CdWO4; respectively, while PbWO4 had nosignificant change. IBIL analysis on CaWO4 nanoparticles produced a 40 nm blue shift from the commercial powderemission. These preliminary results suggest that both size and cation Z may affect the emission properties of the MWO4scintillators.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.