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Radioactive for of iode is called as “radioiode”. It emits radiation to the environment. Radioiode therapy is known as “atom therapy” by people. It is used for treatment of goiter diseases and some cancers of thyroid gland. 

Radioiode taken as capsule or liquid orally is absorbed by the digestive system and collects in thyroid gland cells. Radiation emitted stops growth and action of thyroid cells. Function of over-working thyroid gland becomes normal or undesired thyroid tissues disappear. 

Radioiode dose varies by thyroid patients. Low dose may be administered to some patients and high dose to some patients. If the low dose is administered, the patient can go home after the therapy. In the case of high dose, the patient should stay at the special room for radioiode therapy at the hospital to prevent radiation emission to the environment. Duration of hospitalization may vary between 3 days and 1 week by the radiation quantity, dose and daily measurements. Radioactive substances lead to radiation and reduce in accordance with certain half-life rule. It is eliminated from the body by urine or intestine. The most frequently used radioactive substance in nuclear medicine is technetium and half life is 6 hours. 

Radioiode therapy isn’t administered to pregnant, breastfeeding mothers, patients using iode medicines and that film has been taken by iodic substances. The patient shouldn’t fall pregnant for 6 months following the therapy.