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. 0.4433 0.2045 0.4434 1.0912 5. 0.6014 0.4990 0.4713 1.5716 10. 0.7303 0.7385 0.4590 1.9277 20. 0.8642 0.9952 0.4394 2.2988 50. 1.0432 1.3593 0.4178 2.8203 100. 1.1741 1.6134 0.4072 3.1948 200. 1.2981 1.8450 0.4020 3.5450 500. 1.4420 2.0741 0.4014 3.9174 1000. 1.5324 2.2119 0.4079 4.1523 2000. 1.6065 2.3061 0.4186 4.3312 5000. 1.6788 2.3884 0.4384 4.5056 10000. 1.7164 2.4272 0.4583 4.6019 20000. 1.7432 2.4517 0.4816 4.6766 50000. 1.7643 2.4715 0.5180 4.7539 100000. 1.7747 2.4795 0.5492 4.8034