Two-beam non-dispersed atomic-absorption photometer and investigation into some its characteristics

A double-beam non-dispersing atomic-absorption photometer with differential method of recording was developed. With this photometer the limits for detecting Cu, Ag, Bi, In, K, Na and Cs were found to be comparable with data obtained with single-beam spectrophotometers. Equations were derived describing the precision parameters and conversion errors in which account was taken of the main stages in the formation of the useful signal. The equations made it possible to determine the statistical characteristics of photometers through calculations