The Energies of the γ -Rays from Radioactive Scandium, Gallium, Tungsten, and Lanthanum

The energies of some γ-rays have been determined by the method of semicircular focusing of Compton recoils in a magnetic spectrograph. The results thus obtained are as follows: The two quanta emitted in the disintegration of Ga⁷² are present with equal intensity, which suggests that they may be in cascade. The γ-ray activity of Ga⁷² was followed for 100 hours and was found to decay with a half-period of 14.25±{}0.20 hr.