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Direct detection of vacuum ultraviolet scintillations in liquid helium produced by 5.3 MeV α particles has been accomplished using a high-purity germanium photodiode. The diode was immersed in the liquid helium and operated in the side-entry mode with a senstive area of 0.3×1.0 cm. Scintillation from each α particle was detected as a single pulse. A signal rise time <0.1 μs was obtained at an electric field ≳1200 V cm−1. The quantum efficiency of the photodiode was estimated to be ∼4.
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Luke et al. (1982) studied this question.
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