A Method of Measuring the Mobility of Radioactive Ions

Abstract
We have measured the mobility of ions in air. The method of measuring the mobility is a time‐of‐flight method. The time of flight of the ions is measured between two grids G1 and G2, as in Bradbury's method. We have improved the resolution of the apparatus, using a rectangular cyclic voltage, and we have eliminated harmonic peaks. Results with radioactive ions of ThC″ and ions created in air by the β rays of a tritium source are discussed.

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