Muon radiative energy loss (in 1.0E06 cm^2/g) in Thorium with Z = 90, A = [232.03806(2)] (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 2.0665 0.3212 0.3589 2.7466 5. 2.8718 1.9386 0.3831 5.1934 10. 3.5299 3.1965 0.3757 7.1020 20. 4.2054 4.3520 0.3624 8.9197 50. 5.0885 6.1232 0.3476 11.5593 100. 5.7156 7.2895 0.3406 13.3457 200. 6.2866 8.3206 0.3374 14.9446 500. 6.9255 9.2624 0.3376 16.5255 1000. 7.3088 9.7599 0.3428 17.4114 2000. 7.6058 10.1177 0.3510 18.0745 5000. 7.8802 10.4164 0.3660 18.6626 10000. 8.0155 10.5539 0.3809 18.9503 20000. 8.1049 10.6437 0.3982 19.1467 50000. 8.1786 10.7101 0.4252 19.3139 100000. 8.2112 10.7378 0.4483 19.3972