Belle electromagnetic calorimeter

We report the performance of the Belle electromagnetic calorimeter for the first three years operation. Good mass resolutions for π0 and η are obtained to be 4.8 and 12.1 MeV/c2, respectively. The degradation of light output due to the radiation damage is small, about 3% for the radiation dose of 40 rad. These performances promise further study of B physics with neutral particle reconstruction.