We measured continuum x-rays from an aluminium target bombarded with 60 keV- and 80 keV- proton beams. On the basis of the PWBA theory, we calculated the thick target yields of atomic bremsstrahlung and nuclear bremsstrahlung produced in very low energy ion-atom collisions and compared with the experiment. The present theory predicts that the main component of continuum x-rays produced in such low energy ion-atom collisions is the nuclear bremsstrahlung. The theory presents the yields of continuum x-rays about 5 times larger than the experimental ones, however, reproduces well the spectral shape.
