Muon radiative energy loss (in 1.0E06 cm^2/g) in Niobium with Z = 41, A = 92.90638(2) (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 1.1792 0.5132 0.3920 2.0844 5. 1.6197 1.3813 0.4189 3.4199 10. 1.9775 2.0558 0.4000 4.4333 20. 2.3448 2.7202 0.3890 5.4540 50. 2.8279 3.7049 0.3777 6.9104 100. 3.1739 4.3663 0.3694 7.9096 200. 3.4928 4.9617 0.3654 8.8200 500. 3.8558 5.5169 0.3654 9.7381 1000. 4.0779 5.8155 0.3712 10.2646 2000. 4.2533 6.0331 0.3803 10.6667 5000. 4.4188 6.2162 0.3971 11.0322 10000. 4.5021 6.3016 0.4140 11.2177 20000. 4.5580 6.3572 0.4335 11.3488 50000. 4.6046 6.3994 0.4640 11.4680 100000. 4.6258 6.4170 0.4900 11.5327