Liquid Scintillation Counter (LSC)

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  • When combined, LSC fluid & RAM produce light (scintillate).

  • This light is multiplied and counted using photomultiplier tubes.

  • There are two photomultiplier (PM) tubes in a LSC and they are used for “coincidence counting.”

  • In this type of counting, light from the RAM/LSC fluid combination must hit both tubes to count as one radiation event.

  • With one PM tube, normal background is 1500 cpm.

  • With two PM tubes, background is reduced to 18 cpm which makes LSC counters very efficient for low activity counting.

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