Muon radiative energy loss (in 1.0E06 cm^2/g) in aluminum oxide (sapphire, Al%2#O%3#) with Z/A = 0.49038 (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 0.3928 0.1798 0.4489 1.0215 5. 0.5329 0.4395 0.4765 1.4489 10. 0.6474 0.6526 0.4636 1.7636 20. 0.7667 0.8818 0.4435 2.0919 50. 0.9265 1.2062 0.4214 2.5542 100. 1.0437 1.4334 0.4107 2.8878 200. 1.1549 1.6361 0.4052 3.1962 500. 1.2841 1.8475 0.4046 3.5362 1000. 1.3660 1.9712 0.4112 3.7484 2000. 1.4330 2.0580 0.4221 3.9131 5000. 1.4986 2.1331 0.4422 4.0739 10000. 1.5329 2.1685 0.4624 4.1638 20000. 1.5570 2.1908 0.4861 4.2340 50000. 1.5767 2.2088 0.5232 4.3086 100000. 1.5861 2.2161 0.5549 4.3572