Muon radiative energy loss (in 1.0E06 cm^2/g) in potassium oxide (K%2#O) with Z/A = 0.48834 (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 0.5991 0.2813 0.4309 1.3112 5. 0.8151 0.6910 0.4588 1.9650 10. 0.9906 1.0178 0.4475 2.4560 20. 1.1721 1.3615 0.4290 2.9626 50. 1.4130 1.8517 0.4085 3.6733 100. 1.5879 2.1904 0.3986 4.1769 200. 1.7515 2.5021 0.3936 4.6473 500. 1.9411 2.8020 0.3932 5.1363 1000. 2.0595 2.9686 0.3995 5.4277 2000. 2.1551 3.0908 0.4098 5.6558 5000. 2.2475 3.1950 0.4289 5.8714 10000. 2.2952 3.2440 0.4480 5.9871 20000. 2.3287 3.2757 0.4704 6.0748 50000. 2.3551 3.3001 0.5053 6.1604 100000. 2.3679 3.3103 0.5352 6.2133