[Evaluation of the chest roentgenograms of 90 workers employed in the production of silicon-alloys (author's transl)].

The chest X-rays (double exposed; focus 0.6 X 0.6 mm2; grid 10:1 ratio; FFD 2.0 m) of 90 workers employed in the production of silicon-alloys were classified according to ILO U/C 1971: 14 have been considered "border line" and 14 showed definite pathologic findings. Among the last, 10 concerned subjects who had never previously been exposed to ther dusts.