Scintillator - definition
Scintillator - definition
A scintillator is a material or device used to detect ionising radiation by emitting light through the interaction of energetic particles such as gamma photons, electrons, protons or alpha particles. This phenomenon, known as scintillation, involves the absorption of energy by the atoms or molecules of the scintillating material and their rapid transition to an excited state, followed by the emission of photons in the visible or ultraviolet light range.
Scintillators can be in the form of crystals, liquids, plastics or thin films and are selected according to the type of radiation and the detection requirements. Typical scintillator materials include e.g. thallium-doped sodium iodide (NaI:Tl), caesium bromide (CsBr), gadolinium oxide (Gd₂O₂S), organic plastics or special organic liquids. Key parameters of scintillators are light output, signal fade time, density, transparency and resistance to radiation and environmental factors.
The light emitted by the scintillator is recorded by a photodetector - usually a photomultiplier tube (PMT), photodiode or silicon detector - which converts it into an electrical signal proportional to the energy of the recorded particle. Scintillation systems find applications in gamma-ray spectrometry, computed tomography (PET, SPECT), environmental monitoring, dosimetry and particle detection in high-energy physics.
Due to their high sensitivity and ability to precisely analyse the energy spectrum, scintillators are widely used in radiation detectors, both in scientific laboratories and in medical diagnostics, nuclear technology, industry and security systems. Contemporary research on scintillators focuses on improving energy resolution, increasing detection speed and integration with modern signal readout systems.
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