Muon radiative energy loss (in 1.0E06 cm^2/g) in polyacrylonitrile [(C%3#H%3#N)%n#] with Z/A = 0.52767 (f12.0,4f12.4) E (GeV) b_brem b_pair b_nucl b_total 2. 0.2440 0.1055 0.4733 0.8229 5. 0.3309 0.2616 0.5004 1.0929 10. 0.4030 0.3975 0.4852 1.2857 20. 0.4793 0.5462 0.4626 1.4881 50. 0.5836 0.7549 0.4381 1.7766 100. 0.6622 0.9032 0.4260 1.9914 200. 0.7361 1.0402 0.4199 2.1962 500. 0.8242 1.1824 0.4189 2.4257 1000. 0.8811 1.2701 0.4258 2.5770 2000. 0.9284 1.3321 0.4373 2.6976 5000. 0.9757 1.3869 0.4587 2.8215 10000. 1.0011 1.4129 0.4804 2.8943 20000. 1.0189 1.4293 0.5059 2.9540 50000. 1.0343 1.4421 0.5458 3.0222 100000. 1.0412 1.4474 0.5801 3.0687