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Certain radionuclides can be used to provide targeted radiotherapy. Thanks to its chemical properties, the molecule containing the radioactive part seeks the desired tissue. It sends beta radiation to a range of a few millimetres and destroys tissue very locally. In this way, thyroid tissue can be reduced without surgery or the amount of excess red blood cells reduced in blood, for example. In radioiodine therapy used to treat hyperthyroidism, the patient is administered radioiodine orally and this agent seeks the thyroid gland.