No.2 IEER SDA Vol. As a solid it is shiny, black and non-metallic. In its non-radioactive form occurs on land and in the sea in sodium and potassium compounds, and is necessary for proper functioning of the thyroid. Likely increase of thyroid cancer risk in children exposed before the age of 15 years. Children under five at highest risk.
Females have more than twice the risk of males.
Linked to other thyroid disorders, such as autoimmune hypothyroidism, autoimmune thyroiditis, hyperthyroidism incident to Grave's disease, and thyroid nodules. Return to SDA Vol.