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Properties of vacuum evaporated 83Rb/83mKr sources of low-energy conversionelectrons, which are under development for monitoring the energy scalestability of the Karlsruhe Tritium Neutrino experiment KATRIN, were examined bythe Timepix pixel detector exhibiting the position resolution of at least 55microm. No distinct local inhomogeneities in the surface distribution of83Rb/83mKr were observed. The source diameter derived from the recorded imageagrees within 5 % with that expected from evaporation geometry. More precisedetermination of the actual source diameter is complicated by Compton scatteredelectrons caused by 83Rb gamma-rays.

Distribution of the 83Rb/83mKr activity on vacuum evaporated samples examined with the Timepix position sensitive detector