“…4.2). Baranov et al (1962Baranov et al ( , 1968, using a double-focusing magnetic spectrometer, found at least 19 a-groups with energies ranging from 4.51 to 5.06 MeV and additional lowabundance groups have been detected by a-g coincidence measurements (Lange and Hagee, 1968). Predictably, the g-ray spectrum, as recorded with a high-resolution Ge detector, is even more complex (Fig.…”