An anthracene scintillation counter with single-channel pulse height selection was used as a lowbackground detector in a magnetic-lens β-ray spectrometer. By analyzing the spectrum of the Compton electrons ejected from a thick converter three new γ-rays in the decay RaC → RaC′ were found: 2.72 ± 0.02 MeV, 2.89 ± 0.05 MeV. and 3.03 ± 0.03 MeV, with intensities of 0.026, 0.005, and 0.013, resp., setting the intensity of the 2.204-MeV γ-ray equal to unity. β-ray groups, if existing, from RaC″ to RaD-levels ≦ 1.07 MeV have an intensity < 5 · 10-3 per RaC″ decay. The upper limit for the intensity of a 3.20-MeV crossover γ-ray in the decay ThC″ → ThD was measured to 1.5 · 10-4 per ThC″ decay