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Human liver cancer cells SMMC-7721 were irradiated by single (0.68, 6.8 and 68Gy) and fractionated (twiceand thrice, interval 2h, total dose of 68Gy) 25MeV/u 40Ar14+. Micronuclei induced by the irradiation wereobserved by fluorescence microscope, and stat