Muon radiative energy loss (in 1.0E06 cm^2/g) in Rubidium with Z = 37, A = 85.4678(3) (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 1.0531 0.4733 0.3952 1.9216 5. 1.4453 1.2441 0.4220 3.1114 10. 1.7639 1.8439 0.4030 4.0109 20. 2.0911 2.4394 0.3918 4.9223 50. 2.5220 3.3191 0.3802 6.2213 100. 2.8310 3.9117 0.3718 7.1145 200. 3.1164 4.4464 0.3678 7.9306 500. 3.4419 4.9466 0.3678 8.7563 1000. 3.6416 5.2163 0.3736 9.2315 2000. 3.7997 5.4132 0.3829 9.5957 5000. 3.9493 5.5791 0.3999 9.9283 10000. 4.0248 5.6566 0.4169 10.0983 20000. 4.0756 5.7070 0.4367 10.2192 50000. 4.1180 5.7453 0.4675 10.3308 100000. 4.1373 5.7613 0.4938 10.3924