  Application of CaMoO4 as a scintillation target in cryogenic rare event
searches relies on the understanding of scintillation properties of the
material at the temperatures at which these detectors operate. We devised and
implemented a detection module with a low-temperature photomultiplier from
Hamamatsu (model R8520-06) powered by a Cockcroft-Walton generator. The
detector module containing the CaMoO4 crystal was placed in a 3He/4He dilution
refrigerator and used to measure scintillation characteristics of CaMoO4 in the
millikelvin temperature range. At the lowest temperature achieved, the energy
resolution of CaMoO4 for 122 keV from a 57Co source is found to be 30% (FWHM),
and the fast and slow decay constants are 40.6+-0.8 us and 3410+-50 us,
respectively. The temperature variation of the CaMoO4 decay kinetics is
discussed in terms of a three-level model of the emission center
