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We have investigated the effects caused by proton-induced radiation damage onMulti-Pixel Photon Counter (MPPC), a pixelized photon detector developed byHamamatsu Photonics. The leakage current of irradiated MPPC samples linearlyincreases with total irradiated doses due to radiation damage, which is notcompletely recovered even after a year from the irradiation. No significantchange has been observed in the gains at least up to 8.0 Gy ($9.1\times10^7$n/mm$^2$ in 1 MeV neutron equivalent fluence, $\Phi_{\rm eq}$). The device hascompletely lost its photon-counting capability due to baseline fluctuations andnoise pile-up after 21 Gy irradiation ($2.4\times10^8$ n/mm$^2$ in $\Phi_{\rmeq}$), which might be problematic for some applications, such as ring-imagingCherenkov detectors. We have found that the pulse-height resolution has beenslightly deteriorated after 42 Gy irradiation ($4.8\times10^8$ n/mm$^2$ in$\Phi_{\rm eq}$), where the measured sample has been illuminated with a fewhundred photons. This effect should be considered in the case ofenergy-measurement applications.

Effects of radiation damage caused by proton irradiation on Multi-Pixel Photon Counters (MPPCs)