BETA-DECAY EFFECTS OF LANTHANIDE ATOMS IN CHELATE COMPOUNDS .3. BETA-DECAY EFFECTS IN VISCOUS SOLUTIONS

The rupture of the metal ligand bonds associated with β-decay of 171Er- and 177Yb-CyDTA chelate compounds were studied as the functions of the concentration of the free metal ion (the scavenger of CyDTA ligand ion fragments), the content of glycerol in the solutions and the temperature in ethanol-water solution. The results obtained in viscous and frozen solutions were interpreted by a bond rupture mechanism involving scavenging and recombination reactions. The decrease in the percentage bond rupture with the addition of glycerol or ethanol was considered to be due to the increase of viscosity which results in a decrease of the distance between geminate daughter metal ion and ligand ion fragment. © 1978.