  We study the possibility to influence the lifetime of nuclear isomeric states
with the aid of incident fluxes of photons. We assume that a nucleus initially
in an isomeric state |i> first absorbs an incident photon of energy E_{ni} to
reach a higher intermediate state |n>, then the state |n> decays to a lower
state |l>. In favorable cases the two-step induced emission rates become equal
to the natural isomeric decay rates for incident power densities of the order
of 10^{10} W cm^{-2}.
