CHEREN, the Cherenkov counting efficiency. Nature of problem: Although the commercial liquid-scintillation counters are efficient Cherenkov light detectors, experimentalists commonly prefer to apply liquid scintillators, because the detection efficiency is always higher. However, Cherenkov counting techniques may be comparatively advantageous in certain situations in which the use of a liquid scintillation cocktail is not feasible. In particular, the ability to recover the radioactive sample unaltered, and the possibility to enhance the total volume of radioactive substance added into the vials are particularly interesting. Also the threshold condition for the emission of Cherenkov radiation can be applied as a powerful tool to discriminate electron energies below the threshold energy.
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