The Disintegration ofI128

The $\beta$ and $\gamma$-radiations of the 25-min. activity of ${\mathrm{I}}^{128}$ have been investigated by means of a $\beta$-spectrograph and a special technique for the $\gamma$-determination. The disintegration is shown to be complex. The main transition (93 percent) occurs to the ground level in ${\mathrm{X}}^{128}$ with the release of 2.02-Mev energy. A faint $\gamma$-ray of 0.428 Mev is found, corresponding to an excited level in ${\mathrm{X}}^{128}$.