A high-selectivity β spectrometer

Measurements of β spectra from fission fragments are complicated by high background of γ rays and neutrons. A scintillation β spectrometer capable of precisely reconstructing the β particle spectra in the energy range of >1 MeV has been developed to reduce the effect of this background without deteriorating the high detection efficiency for β particles. The functional diagram of the spectrometer is described, and the results of spectrometer testing using radioactive electron sources are presented.