1. It can be seen that with the increase of irradiation dose, only noise rate increase slightly, other specifications such as efficiency, time resolution, dark current and signal amplitude have not any deterioration after long time irradiation. 2. In the course of low dose rate radiation, performance deterioration of MRPC is temporarily. If the radiation was stopped, it's performance can resume soon. 3. When the radiation dose rate is high, the damage of MRPC is permanent. 4. The goal of the test was to prove that the performance of the detector is deteriorated by the large irradiation dose expected in the experiment in several years of operation.
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