  Scintillation characteristics of a thallium doped sodium iodide (NaI(Tl))
crystal with a dimension of 0.6 x 0.6 x 2 cm3 are studied by attaching a
silicon photomultiplier (SiPM) direct to the crystal over a temperature range
from 93 to 300 K. The scintillation light output and decay time are measured by
irradiating 59.54 keV gamma-rays from a 241Am source. We observed approximately
20% increase in light yield at 230K compared to that at the room temperature.
At this condition, the NaI(Tl) crystal coupled with the SiPM can be a good
candidate for future dark matter search detector.
