The leakage radiation from a diagnostic tube housing is measured “when the tube is operated at its maximum continuous rated current for the maximum rated tube potential”. As the potential across the tube is reduced, the maximum rated continuous current increases to maintain a constant input in heat units per second. On several occasions the question has been asked as to the decrease in leakage radiation as the potential is reduced and the current increased. A study has been done at kilovoltages from 150 to 85 kVp at the maximum rated continuous current. The results have been related to protective barrier requirements.
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