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In page Central nervous system tumor:
"In internal radiation therapy, the source of radiation is inserted into the patient's body. This may be done by placing a solid source of radiation adjacent to the tumor in the form of a seed, ribbon or capsule (brachytherapy)[1] or by giving the patient a liquid source of radiation that travels through the body and kills cancer cells (system therapy). In this case the radiation is usually given in the form of injections, ingesting a capsule or through an intravenous line.[citation needed]
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