During the past year, the scintillation counter has received widespread acceptance as a fundamental tool of nuclear research. It offers three advantages over previous counters: The light output is proportional to the amount of energy lost by the particle, thereby supplementing the beta proportional counter in the high energy region; it detects gamma rays about a hundred times more efficiently than Geiger counters, without a corresponding increase in cosmic ray background; and the time of passage of the primary particle can be measured to a hundred millionth of a second.

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