Muon radiative energy loss (in 1.0E06 cm^2/g) in Einsteinium with Z = 99, A = [252.0830(4)] (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 2.2809 0.2072 0.3561 2.8442 5. 3.1731 1.9971 0.3800 5.5503 10. 3.9027 3.3916 0.3727 7.6670 20. 4.6514 4.6603 0.3596 9.6713 50. 5.6295 6.6158 0.3449 12.5902 100. 6.3231 7.9006 0.3380 14.5617 200. 6.9539 9.0340 0.3348 16.3227 500. 7.6580 10.0671 0.3350 18.0601 1000. 8.0794 10.6116 0.3402 19.0313 2000. 8.4053 11.0028 0.3483 19.7564 5000. 8.7056 11.3288 0.3631 20.3975 10000. 8.8533 11.4787 0.3778 20.7099 20000. 8.9506 11.5766 0.3950 20.9222 50000. 9.0375 11.6489 0.4217 21.1081 100000. 9.0662 11.6789 0.4446 21.1896