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A model for calculating shielding requirements in diagnostic X-ray facilities

¹ Medical Physics Unit, "Konstantopoulio-Agia Olga" Hospital, 3–5 Agias Olgas, Nea Ionia, 142 33, Athens, ² Medical Physics Department, Medical School, University of Athens, 75 Mikras Asias, 115 27, Athens and ³ Radiology Department, Areteion Hospital, 76 Vasilissis Sophias, 115 28, Athens, Greece

In this study a new model for calculating shielding requirements in diagnostic X-ray facilities is presented. It is based on the combination and modification of models and concepts originally proposed by other authors in order to calculate barrier requirements in diagnostic X-ray facilities accurately and realistically without unjustified exaggerations. With this model, multiple sources of radiation operating at different potentials, leakage radiation reduction when operating at potentials less than the maximum rated value, secondary radiation use factors reduction for primary barriers, attenuation by image receptor hardware and existing building materials are all taken into account. Examples of shielding calculations for typical cases are given illustrating the differences between the various models and concepts proposed, as well as the potential reduction in shielding requirements without compromising the radiation protection of public and staff.

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