The response of a CdWO4 crystal scintillator to protons, alpha particles, Li, C, O and Ti ions with energies in the range 1 - 10 MeV was measured. The non-proportionality of CdWO4 for low energy electrons (4 - 110 keV) was studied with the Compton Co
incidence Technique. The energy dependence of the quenching factors for ions and the relative light yield for low energy electrons was calculated using a semi-empirical approach. Pulse-shape discrimination ability between gamma quanta, protons, alpha particles and ions was investigated.
The light output, $alpha/beta$ ratio, and pulse shape have been investigated at $-25^circ$ C with PbWO$_4$ crystal scintillators undoped, and doped by F, Eu, Mo, Gd and S. The fast $0.01-0.06 mu$s and middle $0.1-0.5 mu$s components of scintillation
decay were observed for all the samples. Slow components of scintillation signal with the decay times $1-3 mu$s and $13-28 mu$s with the total intensity up to $approx50%$ have been recognized for several samples doped by Molybdenum. We found some indications of a pulse-shape discrimination between $alpha$ particles and $gamma$ quanta with PbWO$_4$ (Mo doped) crystal scintillators.
