An experimental method for measuring scintillation decay times of the order of nanoseconds is described. The method involves a repetitive time selection technique; i.e., in a sense, it is the electronic equivalent of the original Becquerel phosphoroscope. The complete circuitry is shown and some illustrative results are given.

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Our new equipment has decreased observational scatter and permits more detailed analysis of the various features of the decay curves. Application of computer techniques may establish the various decay‐time contributions more accurately than was possible heretofore.
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