Gamma counter

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A Gamma Counter is a machine to measure gamma radiation emitted by a radionuclide. Up to 300 samples are placed in sealed vials or test tubes, and move along a serpentine track on a horizontal plain. One at a time, they move down inside a shielded detector, set to measure specific energy windows characteristic of the particular isotope. Depending on the half life and concentration of the sample, measurement times vary from 0.02 minute to one minute. Gamma counters are standard tools used in the research and development of new radioactive compounds used for diagnosing and treating disease, (as in PET scanning). A representative unit is the "Gamma 8000", (produced by Beckman) which can be programmed for measuring up to ten different radionuclides.