Schematic diagram of plastic scintillator detecting the incoming particles (neutrons, gamma-rays, etc.). (IMAGE)
Caption
Plastic scintillators are good alternatives for liquids, single crystals used in fields of nuclear safety, border security for neutron detection in the presence of a gamma radiation background, as they are more robust and inexpensive without handling safety and field operation that can be produced in varieties of sizes and shapes. The incoming radiation particles causes the organic scintillator fluorescence containing a short decay (prompt) and a long decay (delayed) components, where the slow component is determined by a bimolecular process of the triplet (T1) excitons triplet–triplet interaction and annihilation (TTA) showing dependence on the particle species. The fluorescence photons from the scintillator are collected by a photoelectric conversion device (SiPM, PMT etc.) and are recorded using a digitized pulse to integrate the slow (Qtail) and total (Qtotal) components in order to discriminate radiation particles.
Credit
Yingdu Liu
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CC BY-NC