The aim of this work was to explore the limits of polycrystalline ceramic scintillator in countering the nuclear threat.
The goal was to develop a polycrystalline LaBr<sub>3</sub>:Ce, which can be processed from ceramic forming techniques and can
be produced in large size scintillator panels with lower cost and high production rate. Three high purity raw powders
were used as the starting materials including LaBr<sub>3</sub>, LaCl<sub>3</sub>, and CeBr<sub>3</sub>. Powder characteristics were measured. A melt spinning method was used to synthesize the nanoparticle LaBr<sub>3</sub>:Ce with stoichiometric compositions. The synthesized nanoparticles were characterized and the average particle size of the synthesized nanoparticle LaBr<sub>3</sub>:Ce was about 50 nm. The melt spun powders were consolidated using a "Nanosintering" method to achieve a high density while
maintaining the stoichiometric composition. The grain size of the sintered polycrystalline is about 50 nm, which shows no grain growth during the densification process.