It is well known that an atom in its ground state absorbs light at discrete wavelengths (E = h*c/λ). In order to measure this narrow light absorption with maximum sensitivity, it is necessary to use a line source, which emits the specific wavelengths which can be absorbed by the atom. Narrow line sources not only provide high sensitivity, but also make atomic absorption a very specific analytical technique. The two most common line sources used in atomic absorption are the “hollow cathode lamp, HCL” and the “electrodeless discharge lamp, EDL”.