Xenon-filled multi-wire proportional chambers have a high detection efficiency for x rays commonly used in diagnostic radiology, and through electronic amplification every detected event can be made visible on a final picture. Since the image is obtainable from electrical signals, these devices also afford the opportunity to obtain digital data. We present here the results obtained with a 20x20 cm.2 wire-chamber filled with a mixture of 94.5 per cent xenon, 5 per cent CO2, and 0.5 per cent freon 13B-1. The spatial resolution of the chamber was of the order of 1 mm. and the detection efficiency varied between 97 and 2.5 per cent in the x-ray energy range from 5 kev. to 100 kev.