Ten new spectroscopic standard samples are now available from the National Bureau of Standards. These consist of three standards each for two titanium alloys and four standards for high-temperature alloys. The new standards are useful for both optical emission and x-ray methods of analysis.
Robert E. Michaelis, "Spectroscopic Standard Samples of Titanium and High-Temperature Alloys," Appl. Spectrosc. 15, 7-8 (1961)