Muon radiative energy loss (in 1.0E06 cm^2/g) in Magnesium tetraborate MgB%4#O%7# with Z/A = 0.49014 (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 0.3009 0.1342 0.4609 0.8961 5. 0.4080 0.3296 0.4880 1.2256 10. 0.4959 0.4940 0.4739 1.4640 20. 0.5882 0.6726 0.4527 1.7135 50. 0.7128 0.9244 0.4295 2.0668 100. 0.8051 1.1033 0.4182 2.3266 200. 0.8929 1.2653 0.4125 2.5708 500. 0.9958 1.4310 0.4117 2.8386 1000. 1.0613 1.5321 0.4186 3.0120 2000. 1.1155 1.6025 0.4297 3.1477 5000. 1.1690 1.6644 0.4505 3.2840 10000. 1.1972 1.6937 0.4715 3.3624 20000. 1.2169 1.7122 0.4961 3.4252 50000. 1.2335 1.7269 0.5346 3.4950 100000. 1.2413 1.7329 0.5675 3.5418