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Equivalent dose to the fetus from occupational exposure of pregnant staff in diagnostic radiology

¹Princess Margaret Hospital, Department of Clinical Physics, 610 University Avenue, Toronto, Ontario M5G 2M9, Canada and ²Regional Medical Physics Department, Newcastle General Hospital, Westgate Road, Newcastle Upon Tyne NE4 6BE, UK

View larger version (21K): [in a new window]   Figure 1. (a) Schematic presentation of a simplified model of irradiation of staff (particularly the staff geometry) used in the Monte Carlo simulation. The outer block represents the trunk of an adult member of staff and the inner block represents the uterus. (b) Schematic presentation of the geometry used in the experimental validation of the Monte Carlo code.

View larger version (19K): [in a new window]   Figure 2. Comparison of normalized equivalent dose to the uterus for scattered irradiation generated at different tube potentials (kVp). , experimental data; , Monte Carlo data.

View larger version (31K): [in a new window]   Figure 3. Comparison of experimentally measured data () with Monte Carlo calculated data () for primary irradiation and when the phantom is covered with 0.25 mm lead, for 90 kVp (top), 80 kVp (middle) and 70 kVp (bottom). Equivalent dose to the uterus nomalized to thermoluminescent dosemeter readings when placed (A) under and (B) over the lead apron.