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The phenomenon of florescense due to excitation by radioactivity is known as "Scintillation". The light emited in scintillation can be detected by coupling it to a photomultiplier, which converts the photon energy to the energy of the original radioactive event.                                                                                                                                                                                Scintillation  can be counted by two different techniques.1. Solid or external scintillation counting 2. Liquid or internal scintillation counting. 

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scintillation counting is the measurement of activity of a sample of radioactive material which uses the technique of mixing the active material with a liquid scintillator, and countingthe resultant photon emissions.

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