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When radiation therapy is delivered internally, it is called brachytherapy. Brachytherapy
uses a radioactive source in the form of a wire or a pellet that is sealed in a small
container called an implant. The implant is placed directly into the tumor (interstitial) or
near the tumor (intercavity). Implants may be permanent (low dose rate) or temporary (high
dose rate, commonly called HDR).
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