Muon radiative energy loss (in 1.0E06 cm^2/g) in promethium (Pm) with Z = 61, A = [144.91275(3)] (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 1.5727 0.5391 0.3752 2.4869 5. 2.1725 1.7365 0.4008 4.3097 10. 2.6610 2.6645 0.3928 5.7183 20. 3.1622 3.5488 0.3735 7.0845 50. 3.8191 4.8788 0.3627 9.0607 100. 4.2875 5.7631 0.3551 10.4057 200. 4.7166 6.5517 0.3516 11.6198 500. 5.2007 7.2789 0.3517 12.8312 1000. 5.4940 7.6662 0.3572 13.5174 2000. 5.7234 7.9467 0.3658 14.0359 5000. 5.9376 8.1817 0.3817 14.5010 10000. 6.0442 8.2907 0.3975 14.7324 20000. 6.1152 8.3617 0.4159 14.8928 50000. 6.1741 8.4151 0.4445 15.0337 100000. 6.2005 8.4373 0.4690 15.1067