[{"from": "human", "value": "Provide a brief overview of this molecule. [Na+1].[131I-1]"}, {"from": "gpt", "value": "The molecule is a radiopharmaceutical containing the beta- and gamma-emitting radioisotope I-131. After absorption, the iodide is distributed through the extracellular fluid of the body and accumulates in the thyroid gland, thereby allowing the imaging of the thyroid."}]