Iodine is also used to make polarising filters, such as may be used in LCD displays: Process for polarizing ultraviolet light utilizing oriented, iodide stained film (1966).

The radioactive isotope iodine-131 is sometimes used to treat cancerous thyroid glands: Determination of iodinated thyroglobulin, useful for detecting residual thyroid cancer or metastases after surgery, comprises immunoassay after administration of 131-iodine (2001).


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