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The Mu2e calorimeter is composed by 1400 un-doped CsI crystals coupled tolarge area UV extended Silicon Photomultipliers arranged in two annular disks.This calorimeter has to provide precise information on energy, timing andposition. It should also be fast enough to handle the high rate background andit must operate and survive in a high radiation environment. Simulation studiesestimated that, in the hottest regions, each crystal will absorb a dose of 300Gy and will be exposed to a neutron fluency of 6 x 10^{11} n/cm^2 in 3 years ofrunning.  Test of un-doped CsI crystals irradiated up to 900 Gy and to a neutronfluency up to 9 x 10^{11} n/cm^2 have been performed at CALLIOPE and FNG ENEAfacilities in Italy. We present our study on the variation of light yield (LY)and longitudinal response uniformity (LRU) of these crystals after irradiation.The ionization dose does not modify LRU while a 20% reduction in LY is observedat 900 Gy. Similarly, the neutron flux causes an acceptable LY deterioration(<15%). A neutron irradiation test on different types of SIPMs (two differentarray models from Hamamatsu and one from FBK) have also been carried out bymeasuring the variation of the leakage current and the charge response to anultraviolet led. We concluded that, in the experiment, we will need to cooldown the SIPMs to 0 C reduce the leakage current to an acceptable level.

Radiation hardness test of un-doped CsI crystals and Silicon Photomultipliers for the Mu2e calorimeter