Muon radiative energy loss (in 1.0E06 cm^2/g) in Iridium with Z = 77, A = 192.217(3) (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 1.8631 0.4553 0.3655 2.6839 5. 2.5826 1.8979 0.3903 4.8709 10. 3.1697 3.0176 0.3827 6.5701 20. 3.7722 4.0618 0.3643 8.1983 50. 4.5605 5.6494 0.3539 10.5638 100. 5.1212 6.6987 0.3467 12.1666 200. 5.6330 7.6297 0.3433 13.6059 500. 6.2075 8.4830 0.3434 15.0340 1000. 6.5535 8.9353 0.3488 15.8376 2000. 6.8227 9.2615 0.3572 16.4413 5000. 7.0724 9.5341 0.3725 16.9790 10000. 7.1960 9.6601 0.3877 17.2438 20000. 7.2779 9.7422 0.4055 17.4256 50000. 7.3456 9.8033 0.4331 17.5820 100000. 7.3756 9.8288 0.4568 17.6612