Radiotherapy procedures can deliver radiation beams outside the body (external) or inside the body (internal). For this method, the source of radiation is placed in skin, a body cavity or a tissue of the patient. This type of therapy aims delivering the highest dose to the intended body part, while the damage to nearby tissues is minimized. As the dose moves away from the source, the dose and its effect decrease quickly. Thus, while tumor gets the maximum dose, the healthy tissue around the tumor is exposed to a very low dose. Brachytherapy is an effective treatment especially for gynecologic cancers, but it can also be used some tumors located in different body parts.