A compact separator of monoenergetic electrons

A separator of monoenergetic electrons is described, in which two kinds of assemblies of “miniorange”-type magnetic filters (six magnets in each) are used. The 207Bi isotope with an activity of 240 kBq (7 μCi) that emits K1063 and K1770 conversion electrons serves as the electron source. For different kinds of assemblies, the intensity of electrons with energies of ∼970 and ∼1680 keV is accompanied by an increase in the radiation intensity by factors of 3 and 4, respectively, as compared to the intensities measured without magnetic filters, the energy resolution being ∼30 keV. A single cycle of chamber evacuation guarantees constancy of the instrument’s parameters for one month.