
1) Certain tracer
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A radioactive isotope of iodine. (An isotope is an alternate version of a chemical element that has a different atomic mass). Radioiodine can be used in diagnostic tests as well as in radiotherapy of the thyroid.for hyperthyroidism, radioiodine is administered in capsule form on a one-time basis. It directly radiates thyroid tissues thereby destroy...
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http://www.encyclo.co.uk/local/20973

(ra″de-o-i´o-dīn) any radioactive isotope of iodine; of the nine isotopes, iodine 123, iodine 125, and iodine 131 are the most commonly used in diagnosis and treatment of benign and malignant diseases of the thyroid gland and in scintiscans of organs such as the lung, liver, and kidney. Called also radioactive iodi...
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: rā′dē-ō-ī′ō-dīn Definitions: 1. A radioactive isotope of iodine, 123I.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=74955

Radioiodine: An isotope of the chemical element iodine that is radioactive. Radioiodine is used in diagnostic tests as well as in radiotherapy of an hyperactive thyroid gland (hyperthyroidism), most often due to Graves disease. For hyperthyroidism, radioiodine is administered in capsule form on a one- time basis. It directly radiates thyroid tissue...
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http://www.medterms.com/script/main/art.asp?articlekey=5187
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