Muon radiative energy loss (in 1.0E06 cm^2/g) in Roentgenium with Z = 111, A = [272.1536] (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 2.6334 0.0102 0.3535 2.9971 5. 3.6669 2.0770 0.3773 6.1212 10. 4.5121 3.6914 0.3701 8.5736 20. 5.3794 5.1425 0.3524 10.8742 50. 6.5110 7.3952 0.3426 14.2487 100. 7.3123 8.8714 0.3357 16.5194 200. 8.0397 10.1702 0.3325 18.5424 500. 8.8495 11.3514 0.3327 20.5336 1000. 9.3327 11.9725 0.3378 21.6430 2000. 9.7054 12.4177 0.3458 22.4689 5000. 10.0477 12.7885 0.3605 23.1966 10000. 10.2156 12.9585 0.3750 23.5492 20000. 10.3260 13.0696 0.3920 23.7876 50000. 10.4244 13.1514 0.4185 23.9943 100000. 10.4566 13.1854 0.4412 24.0832