What does brachytherapy refer to in radiation treatment?

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Delivering radiation to tissues from a remote sourceApplying radiation to tissues from a distance of 3 centimetersAdministering radiation by placing radioactive sources directly inside the tissuesUsing radioactive drugs to irradiate tissues

Explanation

Brachytherapy involves the placement of radioactive material directly within or very close to the target tissues, allowing for localized radiation delivery. This distinguishes it from external beam radiation, which irradiates tissues from a distance.