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Organic liquid and nanocomposite scintillators for gamma spectroscopic detections

Scintillation materials for the spectroscopic detection of gamma photons have been made of inorganic crystals, organic liquid and plastic scintillators. These scintillators are either expensive for large-area detection or incapable of gamma spectroscopy. We have reported the syntheses of transparent liquids and plastic nanocomposites comprising high loading of high-Z nanoparticles for gamma photoelectric generation and conjugated organic luminescent systems for visible photon generation. Hafnium oxide nanoparticles and cadmium zinc sulfide quantum dots were loaded into the organics up to 60 wt% via methacrylate-terminated surface functionalization. The liquid scintillator loaded with 40 wt% hafnium oxide nanoparticles demonstrated a light yield of 11699 photons/MeV with an energy resolution of 14.8% for 662 keV gamma. The 60 wt% CZS QD loaded plastic nanocomposite exhibited an optimized light yield of 9275 photons/MeV and produced a gamma photopeak. A radiation hardness study indicates that the loaded liquids and nanocomposites exhibits comparable hardness to the unloaded scintillators.