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ker·ma 'kər-mə n the ratio of the sum of the initial kinetic energies of all charged particles liberated by uncharged ionizing particles (as neutrons) in an element of volume of irradiated matter to the mass of matter in the element of volume
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ker·ma (kurґmə) [kinetic energy released in material] a unit of quantity that represents the kinetic energy transferred to charged particles by the uncharged particles per unit mass of an irradiated medium.Medical dictionary. 2011.