Abstract

A surface ionization source has been constructed to produce Tl + ions having the same magnetic rigidity as light ions of a few MeV energy. The light-ion energy is determined by matching the paths of the light and Tl + ions through a magnetic spectrometer and by measuring the source voltage with a precision voltage divider and voltmeter. The absolute calibration has been verified by measuring the energy of alpha particles from a 212Bi source and by measuring the 14N(p, n) 14O reaction threshold.

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