Definition - What does Scintillator mean?
A Scintillator is material that is used as a detector to measure the number and energy of gamma rays. The material has the property of luminescence when excited by ionizing radiation. This phenomenon is known as scintillation. A scintillator can also be defined as a material that fluoresces when struck by a charged particle or high-energy photon.
Petropedia explains Scintillator
A scintillator device consists of a crystal and a photomultiplier. Both of these instruments have different functionality. In the crystal, an incident gamma ray imparts energy to electrons through Compton scattering, photoelectric absorption and pair production. The electrons excite the detector crystal lattice. Crystal de-excitation emits visible or near-visible light, the scintillation, which is detected by the photomultiplier and transformed into an electrical pulse. The frequency and amplitude of the electric pulse are related to the number of gamma rays and their respective energy levels, and are recorded in a log. Scintillation detectors are used in all natural gamma ray, induced gamma ray and density logging devices.