Abstract
The Guidance Notes [1] allow leakage radiation air kerma rates of up to 1 mGy h−1 at a distance of 1 m, through the housing of X-ray tubes; though it is recommended that leakage radiation should not exceed one-tenth of this value in practice. There is no dispute that for overhead tubes the existing limits are acceptable, particularly as leakage dose rates from most of these tubes are orders of magnitude below the required level. In my own experience, however, the highest leakage radiation measurements are to be found in mobile image intensifier (II) units. Bearing in mind some of the uses to which these theatre II units are put, the question of whether the limits for leakage radiation are really adequate should be raised.
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