Remarks on the trigger induction of the radiative decay of metastable states of isomeric nuclei

The conditions of known experiments on the trigger acceleration of the radiative decay of isomeric nuclear states are compared. It is shown that in the case of quasi-monochromatic inducing sources, the use of Moessbauer targets can increase the efficiency of the process by a few orders of magnitude. It is pointed out that the asymptotic behaviour of the current value of the absorption cross section requires the comparability of the exposure time with upper-level lifetime of the transition. (active media)