The use of highly oriented graphite as a monochromator was recently discussed by Sparks, and has been found to be highly suitable for light-element (Z≥15) x-ray, spectroscopy. This paper compares the diffracting power of the graphite monochromator with ethylenediamine-d-tantrate and LiF.
R. W. Gould, S. R. Bates, and C. J. Sparks, "Application of the Graphite Monochromator to Light Element X-Ray Spectroscopy," Appl. Spectrosc. 22, 549-551 (1968)