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Photoabsorption of nuclear gamma-rays in thin metallic convertors wasexamined with the aim to produce monoenergetic photoelectrons of kinetic energyaround 18.6 keV and natural width of about 1 eV. Calculations were carried outfor commercial photon sources of 241Am (1.1 GBq) and 119mSn (0.5 GBq)irradiating Co and Ti convertors. Photoelectrons ejected by 241Am gamma- andX-rays from Co convertors of various thickness were measured with twoelectrostatic spectrometers.

Feasibility of photoelectron sources for testing the energy scale stablity of the KATRIN beta-ray spectrometer