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.