Inductively coupled plasma atomic emission
Inductively coupled plasma atomic emission spectrometry (ICP-AES) is similar to AAS in that it usually requires a sample to be removed from an object, and it has similar analytical capabilities. It differs, however, in that the excitation source is an argon plasma, heated to around 10,000 degrees Celcius, rather than a flame, and it is the light emitted by a sample that is measured, rather than light which is absorbed. The main advantage of ICP-AES is its speed of operation - it can accurately measure 30 or 40 elements in a matter of minutes.
Hook, D.R., 'Inductively-coupled plasma atomic emission spectrometry and its role in numismatic studies', Ed's W.A.Oddy and M.R. Cowell, Metallurgy in Numismatics, Royal Numismatic Society, (London) 4 (1998), pp. 237-252