The crystals of 0.1, 0.5, 1, and 3% Ho doped Lu 3Al 5O 12 (Ho:LuAG) grown by the micro-pulling-down method were examined for their scintillation properties. At wavelengths longer than 300 nm, Ho:LuAG crystals demonstrated around 60% transparency with many absorption peaks attributed to Ho 3+ 4f 10-4f 10 transitions. When excited by 241Am α-ray to obtain radio luminescence spectra, broad host emission and four sharp Ho 3+ 4f 10-4f 10 emission peaks were detected in the visible region. Light yields and decay time profiles of the samples irradiated by 137Cs\gamma-ray were measured using photomultiplier tubes R7600 (Hamamatsu). Ho 0.5%:LuAG showed the highest light yield of 3100 ±310 photons/MeV among the present samples. The decay time profiles were well reproduced by two components exponential approximation consisting of 0.5-1 μs and 3-6 μs.
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