The paper is submitted as one of the recommendations for diagnostic and therapeutic care in nuclear medicine meant in particular for the clinical need of physicians indication treatment of thyroid carcinoma with iodide. The author presents a brief review of principles, indications, the procedure proper, clinical interpretation and possible risks and contraindications, incl. the clinical and socioeconomic impact.

        Key words: carcinoma, thyroid gland, radioiodide 131, treatment open radiation source, recommendations, nuclear medicine.