  A closed-form thermodynamic pole approach,TPA, is developed for average
description of the E1 radiative strength functions using the microcanonical
ensemble for initial states. A semiclassical description of the collective
excitation damping in this method is based on modern physical notion on the
relaxation processes in Fermi systems.The TPA model gives rather accurate means
of simultaneous description of the gamma- decay and photoabsorption strength
functions in the medium and heavy nuclei. It is able to cover a relatively wide
energy interval, ranging from zeroth gamma-ray energy to values above GDR peak
energy, as compared with the others closed-form models for calculation of the
E1 strength.
