Muon radiative energy loss (in 1.0E06 cm^2/g) in americium (Am) with Z = 95, A = [243.06138(2)] (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 2.1870 0.2617 0.3573 2.8060 5. 3.0410 1.9759 0.3814 5.3983 10. 3.7391 3.3104 0.3740 7.4236 20. 4.4556 4.5296 0.3608 9.3461 50. 5.3920 6.4042 0.3461 12.1424 100. 6.0564 7.6371 0.3392 14.0327 200. 6.6610 8.7257 0.3359 15.7226 500. 7.3365 9.7189 0.3362 17.3915 1000. 7.7412 10.2428 0.3413 18.3253 2000. 8.0544 10.6194 0.3495 19.0233 5000. 8.3434 10.9335 0.3644 19.6412 10000. 8.4857 11.0780 0.3792 19.9428 20000. 8.5795 11.1723 0.3964 20.1482 50000. 8.6633 11.2421 0.4232 20.3287 100000. 8.6910 11.2711 0.4462 20.4084