Cu, Pb, and Sn were determined by x-ray fluorescence analysis in 8 standard bronzes and 5 ancient bronze objects of 8th century B.C. 13th century A.D. origin. A ¹⁴⁷Pm-Al source (45 mCi; bremstrahlung spectrum), a Xe-filled gas proportional counter (Be window thickness 0.5 mm), standard electronic equipment, and a 400-channel analyzer were used. The bronze surface was clean; the analyzed area was 5-10 cm² ( ~ 100mu thick). The concentrations were determined by normalizing the spectrum area between channels No. 1 and 199 at 10⁵ counts. -- AATA