  Heavy-ion collisions can be simulated by means of comprehensive approaches,
to include the many different reaction mechanisms which may contribute. QMD
models and their relativistic extensions are examples of these approaches based
on Monte Carlo techniques. In this paper are shown some results obtained by
coupling a new QMD code, which describes the fast stage of ion-ion collisions,
to the evaporation /fission/Fermi break-up and photon de-excitation routines
present in the FLUKA multipurpose Monte Carlo transport and interaction code.
In particular, we compare the predicted neutron spectra to available
experimental data from thin and thick target irradiations. We show also some
predictions of particle and charged fragment fluences for the interaction of C
and Fe ions with a thick PMMA target, which may be useful to assess the risk of
side-effects in the hadron therapy of tumours.
