The behavior of tracer Ac-228 during Gd2Cl3 condensed cluster formatio
n is studied. The cluster is prepared by electrochemical reduction of
GdCl3. Actinium does not cocrystallize with the Gd2Cl3 cluster. Its be
havior is similar to that of La under analogous conditions. A number o
f hypotheses requiring further refinement is proposed to explain the r
esults.