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Etymology: Gk, isos + doss, giving, charta, paper
a graphic representation of the distribution of radiation in a medium in which lines are drawn through points receiving equal doses. Isodose charts are determined for x-rays traversing the body, for radium applicators used in intracavitary or interstitial treatment, and for working areas where x-rays or radionuclides are used.
in radiotherapy a radiation dose of equal intensity to more than one body area.
a diagram of depth dose measurement at various positions within an x-ray beam in which points of equal dose throughout the beam are joined to give isodose lines.