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A Demountable Phantom of Variable Geometry for Intra-pelvic Dosimetry in Pregnancy—Preliminary Report

"Frederic Joliot-Curie" National Research Institute for Radiobiology and Radiohygiene, Budapest, Hungary

This excerpt was created in the absence of an abstract.

In order to determine the radiographic exposure dose during pregnancy, both to the embryo in different phases of development and to the maternal genitalia, an inhomogeneous, demountable and variable phantom was built. The phantom material used (paraffin wax, 89 per cent; MgO, 11 per cent) was compared with water, with ox muscle and with the Japanese version of Mix D (paraffin wax, 61 per cent; polyethylene, 25 per cent; pine resin, 16·2 per cent; MgO, 6·4 per cent; TiO₂, 2·4 per cent). In the energy range 60–200 kV the material used was by about 5 per cent less absorbent than the other media. It was chosen because of its excellent casting qualities; the individual parts fit closely both to each other and to the bones, a condition much more difficult to obtain with Mix D. The pelvis, femora and vertebrae of a woman of normal stature were built into the phantom, after impregnation with paraffin wax.