  Acrylic (poly(methyl methacrylate) or PMMA) is commonly used as a vessel to
hold scintillating liquids in rare-event searches. Certain types of PMMA can
fluoresce with a low efficiency at room temperature. We have investigated the
fluorescence spectra under 280nm ultraviolet (UV) excitation of the PMMA used
in the DEAP dark matter search at various low temperatures. Fluorescence of
this PMMA is observed, with an increasing intensity as the sample is cooled
from a temperature of 300K down to 4K. The common wavelength-shifter
tetraphenyl butadiene (TPB) is also measured for use as a reference.
