Efficient, Fast, Energy Sensitive γ-Ray Counters for Use above 50 Mev

Abstract
Two energy‐sensitive gamma‐ray counters which have been used in experiments above 50 Mev are described. One counter uses a low Z scintillating liquid to measure the energy loss of an electron pair; the other uses high Z material to develop a shower which is sampled with scintillating plastic sheets. Curves of the experimental performance are included.

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