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.
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