A pilot survey of doses to patients undergoing four types of radiological procedure--barium enemas, intravenous pyelography, cardiac catheterization and mammography--has been made using lithium borate TL dosimeters. The survey was designed to test the operational suitability of the dosimetry system and to gain experience and gather data for the planning of further larger surveys. The TL dosimeters were calibrated against conventional ionization chambers, and then used on patients for determining gonad doses and maximum doses to the skin. Few difficulties were encountered in using the system. The measured doses to patients have been compared with previous determinations by other authors and reasonable agreement demonstrated.