  In prospect of its application in cryogenic rare-event searches, we have
investigated the low-temperature scintillation properties of CaWO4 crystals
down to 3.4 K under {\alpha} and {\gamma} excitation. Concerning the
scintillation decay times, we observe a long component in the ms range which
significantly contributes to the light yield below 40K. For the first time we
have measured the temperature dependence of the {\alpha}/{\gamma}- ratio of the
light yield. This parameter which can be used to discriminate {\alpha} and
{\gamma} events in scintillating bolometers is found to be about 8-15% smaller
at low temperatures compared to room temperature.
