The method of thin film PIXE was applied to the analysis of a total of 117 urine specimens from urinary stone sufferers and controls. The overall range of Br levels was between 2 and 18 μg cm-3. Mean values obtained over a period of three days ranged from 6.8 to 9.2 μg cm-3. No significant differences between the Br distributions in the two groups over the collection period were observed. © 1989 Akadémiai Kiadó.</p