Abstract
Positron sources have been produced by ion implantation of 22Na into foils of Al, Ni and Pt. The ion implantation was carried out at ISOLDE with a Ta-oven and W-surface ionizer unit. Commercial carrier free 22NaCl was ionized with an efficiency of 31%. An implanted Pt foil was annealed at a temperature of 1000°C in order to produce positron sources suitable for in situ positron lifetime spectroscopy in temperature and oxygen partial pressure regions that remain unattainable for conventional positron sources. The lifetimes and relative intensities of positrons annihilating in the implanted sources have been measured and compared with those of a conventional 22NaCl positron source.
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