Abstract
Entrance surface doses (ESD) to patients were monitored in four common diagnostic X ray examinations (chest, hand and wrist, lumbar spine and skull) at the outpatient X ray department of the University College Hospital (UCH), Ibadan. Measurement was based on thermoluminescence dosimetry (TLD) techniques using lithium fluoride discs and a Vinten Solaro TLD reader. Some spread was observed in the values of doses received by patients for each of the examinations. It is greatest for the examination of the skull PA and least for the examination of the skull LAT and lumbar spine AP; due mainly to variations in the sizes of the patients examined. For all examinations the values of the mean ESD obtained range from a minimum of 0.310 ± 0.071 mGy to a maximum of 5.66 ± 0.782 mGy for the examination of the hand and wrist PA and lumbar spine LAT, respectively.
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