Muon radiative energy loss (in 1.0E06 cm^2/g) in erbium (Er) with Z = 68, A = 167.259(3) (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 1.6945 0.5114 0.3705 2.5764 5. 2.3446 1.8127 0.3957 4.5530 10. 2.8746 2.8216 0.3879 6.0842 20. 3.4184 3.7736 0.3691 7.5610 50. 4.1307 5.2122 0.3585 9.7013 100. 4.6379 6.1660 0.3511 11.1549 200. 5.1018 7.0147 0.3476 12.4640 500. 5.6239 7.7949 0.3477 13.7666 1000. 5.9394 8.2096 0.3531 14.5021 2000. 6.1855 8.5092 0.3617 15.0564 5000. 6.4147 8.7601 0.3773 15.5520 10000. 6.5284 8.8762 0.3928 15.7974 20000. 6.6040 8.9519 0.4109 15.9667 50000. 6.6666 9.0085 0.4390 16.1141 100000. 6.6945 9.0320 0.4631 16.1896