Several other properties are also desirable in a good detector scintillator : a low gamma output ( i . e ., a high efficiency for converting the energy of incident radiation into scintillation photons ), transparency to its own scintillation light ( for good light collection ), efficient detection of the radiation being studied, a high index of refraction near that of glass ( H " 1.5 ) to allow optimum coupling to the PMT window.
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