Sodium Iodide (NaI) Counters

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  • NaI probes are primarily used to detect gamma radiation.


  • They can detect higher energy beta particles but are not very efficient for this use.


  • In NaI detection, a photon strikes the NaI crystal.


  • The crystal releases light as a result of the photon interaction.


  • The light is multiplied by a photomultiplier and reads out in counts per minute.


  • The metal shielding that surrounds most NaI detectors makes them inefficient for low energy Beta detection.


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