[en] The influence of alpha and beta/gamma emitters on energy storage in borosilicate glasses during ultimate storage is discussed. The long-term effects are simulated in accelerated tests with borosilicate glasses having the typical composition of highly active glasses and spiked with 2.6-Ci ²⁴²Cm/g glass. The stored energies are measured as a function of dose up to an accumulated dose corresponding to 2 X 10¹⁸ alpha disintegrations per g of glass, at which the saturation range is reached. The method for measuring stored energies in a DTA apparatus is described in detail