Scintillators for PET and SPECT
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A scintillator is a material with the ability to absorb ionizing radiation, such as x-rays or gamma rays, and to convert a fraction of the absorbed energy into visible or ultraviolet (UV) photons. The conversion process typically takes place on a timescale of nanoseconds to microseconds, thus producing a brief pulse of photons corresponding to each gamma ray or x-ray that interacts with the scintillator material . The light pulse, the intensity of which is approximately proportional to the energy deposited in the scintillator, is sensed by a photodetector and converted into an electrical signal.