  A study has been performed to understand the effects of radiation damage on
various plastic scintillator tiles considered for a possible upgrade of the
hadron calorimeter of the CMS detector. Measurements were made with
unirradiated tiles and with tiles that had been irradiated in the CMS collision
hall to a dose of 44 kGy. Results are presented for the tiles of different
shapes in terms of the energy spectrum, efficiency as a function of the
position at which each tile was hit, as well as light yield. All the tiles
showed a light reduction of up to about 50%. The tiles with the shape currently
used in the CMS detector did not see increased non-uniformity of light
collection, while a significant disuniformity was observed for the tiles
considered as alternatives.
