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Training > D&D Dictionary > Liquid Scintillation Counting

Liquid Scintillation Counting

   A standard method for detecting and measuring radiation from beta-emitting nuclides. In this method, samples are dissolved in the solvents containing aromatic solvents and scintillators (a material that emits light when excited by an ionizing radiation).  Beta particles emitted from the sample transfer energy to the solvent molecules, which in turn transfer their energy to the scintillators; this excites the scintillants molecules and thus dissipates the energy by emitting light. The samples are placed in transparent vials and loaded into a  liquid scintillation counter. This counter has two photomultiplier tubes connected in a coincidence circuit. The coincidence circuit assures that genuine light pulses, which reach both photomultiplier tubes, are counted, while spurious pulses are ignored. This is how radiation is measured.
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