Disintegration of ${\mathrm{Ca}}^{47}$, ${\mathrm{Sc}}^{47}$, ${\mathrm{Va}}^{48}$, and ${\mathrm{Rh}}^{100}$

The disintegration of four radioactive isotopes have been investigated, with the following results: ${\mathrm{Ca}}^{47}$ decays by the emission of two beta-ray groups with end-point energies and relative intensities of 685 kev, 81 percent; and 2060 kev, 19 percent. ${\mathrm{Sc}}^{47}$ decays by the emission of two beta-ray groups of end-point energies and relative intensities of 280 kev, 28 percent; and 490 kev, 72 percent. ${\mathrm{V}}^{48}$ decays by the emission of one single positron groups with end-point energy of 693 kev. ${\mathrm{Rh}}^{100}$ decays by the emission of five positron groups with end-point energies and relative intensities of 150 kev, 0.06 percent; 540 kev, 3.64 percent; 1260 kev, 12.8 percent; 2070 kev, 38.5 percent; and 2615 kev, 45.0 percent. Procedures for preparation and chemical purification of these nuclides are described; and also their other characteristics such as half-lives, conversion electrons of associated gamma rays, etc.