Synonymous terminology: radiotherapy prosthesis, carrier prosthesis, radiation applicator, radium carrier, intracavity carrier, intracavity applicator. A device used to administer radiation to confined areas by means of capsules, beads or needles of radiation emitting materials such as radium or cesium. Its function is to hold the radiation source securely in the same location during the entire period of treatment. Radiation oncologists occasionally request these devices to achieve close approximation and controlled application of radiation to a tumor deemed amiable to eradication.

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