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Two alpha-particle counting systems for the measurement of large-area sources have been developed at the National Bureau of Standards. The systems and their characteristics are described. One system uses an internal-source proportional counter and the other measures sources external to the counting volume through a thin aluminized mylar window. The “internal” system is used to measure sources in the lower activity ranges. These calibrated sources arc then used to establish the efficiency of the “external” counter used to measure the higher-activity sources.

The NBS large-area alpha-particle counting systems