Science Daily February 1, 2024 Current particle detectors use bulk crystals, and thin-film organic scintillators have low light yields and limited radiation tolerance. An international team of researchers (Singapore, China) has developed transmissive thin scintillators made from CsPbBr3 nanocrystals, designed for real-time single proton counting. The scintillators exhibited exceptional sensitivity, with a high light yield when subjected to proton beams. The enhanced sensitivity was attributed to radiative emission from biexcitons generated through proton-induced upconversion and impact ionization. The scintillators could detect as few as seven protons per second, a sensitivity level far below the rates encountered in clinical settings. According […]
Tag Archives: Radiation detectors
How lasers can help with nuclear nonproliferation monitoring
Phys.org April 13, 2020 To study hydrodynamics and evolution of uranium (U) atomic and uranium oxide (UO) molecular emission in filament-produced U plasmas researchers in the US (Pacific Northwest National Laboratory, industry, University of Arizona) performed two-dimensional plume and spectral imaging. The results highlight that filament ablation of U plasmas gives a cylindrical plume morphology with an appearance of plume splitting into slow- and fast-moving components at later times of its evolution. Emission from the slow-moving component shows no distinct spectral features (i.e. broadband-like) and is contributed in part by nanoparticles generated during ultrafast laser ablation. They found U atoms […]