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Investigation of the steady state photoconductivity of CdS:Cu crystals under electron beam excitation carried out previously /1/ made it possible to determine the hole trap density and energy position, but the role of Cu centres in recombination processes under high excitation was not clarified. For this purpose, in the present work the photoconductivity a s a function of excitation intensity and the photocurrent transients a r e studied in CdS with different Cu content.