Figure 1. Positions of the patient, the thermoluminescent dosemeters (TLDs) and shields. A, TLD on abdominal wall; B, TLD in vaginal vault; C, polystyrene (breadth 47 cm, depth 12 cm); D, table; E, TLD in mouth; F, polystyrene (breadth 47 cm, depth 12 cm); G, concrete (breadth 5 cm, depth 12 cm); a, 56 cm (isocentre point is TLD on abdominal wall); b, 28 cm; c, 70 cm (isocentre point is TLD in vaginal vault); d, 15 cm; +, brain isocentre point.

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