Abstract
The elastic and Compton signals produced when 60 keV radiation is scattered have been separated with an erbium filter, which has a K absorption edge between the two energies, and recorded by a scintillation counter. The elastic to Compton ratios which characterise the scatterer's composition were measured on a range of target elements. The results agree with the values obtained directly when a high resolution semiconductor detector is used to disperse the spectrum. The use of rugged, cheap scintillator arrays offers a practicable alternative for non-destructive examination by this ratio method.