Muon radiative energy loss (in 1.0E06 cm^2/g) in magnesium (Mg) with Z = 12, A = 24.305(6) (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 0.4434 0.2046 0.4435 1.0914 5. 0.6016 0.4991 0.4713 1.5720 10. 0.7305 0.7387 0.4590 1.9282 20. 0.8645 0.9955 0.4394 2.2994 50. 1.0436 1.3597 0.4178 2.8211 100. 1.1745 1.6139 0.4073 3.1956 200. 1.2984 1.8455 0.4020 3.5459 500. 1.4424 2.0747 0.4014 3.9184 1000. 1.5329 2.2125 0.4080 4.1534 2000. 1.6070 2.3068 0.4186 4.3324 5000. 1.6793 2.3891 0.4384 4.5068 10000. 1.7170 2.4279 0.4583 4.6032 20000. 1.7437 2.4524 0.4816 4.6778 50000. 1.7649 2.4722 0.5180 4.7551 100000. 1.7752 2.4803 0.5492 4.8047