Muon radiative energy loss (in 1.0E06 cm^2/g) in helium gas (He) with Z = 2, A = 4.002602(2) (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 0.0931 0.0351 0.5095 0.6377 5. 0.1279 0.0940 0.5334 0.7553 10. 0.1587 0.1555 0.5141 0.8283 20. 0.1928 0.2229 0.4878 0.9035 50. 0.2417 0.3190 0.4597 1.0205 100. 0.2797 0.3859 0.4462 1.1118 200. 0.3171 0.4486 0.4392 1.2049 500. 0.3621 0.5212 0.4377 1.3210 1000. 0.3922 0.5685 0.4453 1.4059 2000. 0.4178 0.6050 0.4578 1.4805 5000. 0.4443 0.6395 0.4812 1.5651 10000. 0.4589 0.6563 0.5050 1.6202 20000. 0.4695 0.6669 0.5330 1.6694 50000. 0.4786 0.6748 0.5773 1.7307 100000. 0.4830 0.6780 0.6155 1.7765