Radioactive ${\mathrm{In}}^{107}$, ${\mathrm{In}}^{108}$, ${\mathrm{In}}^{109}$, and ${\mathrm{Sn}}^{108}$

A new indium isotope which decayed with a 33±2-min. half-life has been produced by deuteron and proton bombardments of cadmium 106. Evidence for the assignment of the activity to indium 107 is given. Characteristic radiations are positrons of 2-Mev energy and gamma-rays. An indium isotope which decayed with a 4.30±0.15-hr. half-life has been produced by a deuteron and proton bombardment of cadmium 108 and by an alpha-bombardment of cadmium 106. The assignment is made to indium 109. Decay is by emission of 0.75±0.05-Mev positrons, by $K$-electron capture, and by emission of gamma-rays. Two genetically related isotopes in tin and indium have been assigned to mass number 108. The tin isotope, which is produced by bombarding cadmium 106 with alpha-particles, decays with a half-life of 4.5 hr. by $K$-electron capture. The indium isotope, which is produced by the decay of the tin isotope and by bombarding cadmium 108 with deuterons, decays with a half-life of about 55 min. by emitting positrons of 2-Mev energy and gamma-rays.