[en] Our interest lies in amorphous systems with structure near the supercooled liquid state, in metastable equilibrium. Tanaka states that, in this situation, by means of light radiation with energy above the gap, the irradiation induces an increase of the structural disorder. Here, we present results about the influence of γ-radiation (hv approx. equal to 1 MeV) on the relaxation (i.e. evolution toward equilibrium) of amorphous selenium, below the glass transition. Use of γ-radiation, on account of its low absorption, allows the production of electronic excitations in bulk samples, the availability of which is required for precise calorimetric measurements. From these experiments we show that the principal effect of the irradiation is to increase the relaxation rate without appreciably modifying the equilibrium state, when this is achieved. So the irradiated samples have a residual entropy which is lower than that of the unirradiated samples. (orig./CLG)