Water Phantom
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
The water phantom is a device used for determining deep dose in roentgenotherapy. It consists of a metal hollow cylinder that blocks X-rays, with an opening covered by a lead shutter, and contains an ionization chamber that can be adjusted to different depths.
Encyclopedia entry (1928–1936)
Water phantom, is used for determining deep dose in roentgenotherapy. In the figure, the Siemens water phantom is depicted. It consists of a metal hollow cylinder that does not allow X-rays to pass through, in the upper part of which there is a quadrangular opening, closed by a moving lead cover. Lead plates with cutouts of various sizes are inserted into the opening, depending on the size of the irradiated field. On the side, in a special opening, a small ionization chamber is inserted, which by means of a lever can be lowered to a greater or lesser depth (from 0 to 15 cm). When determining deep dose (see Dosimetry), the cylinder is filled with distilled water, for which removal a tap is provided.
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Cite this page
“Water Phantom.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/water-phantom/