From prophylaxis to atomic cocktail: Circulation of radioiodine Santesmases, María Jesús Yodo radioactivo Endocrinología España Junta de Energía Nuclear Gregorio Marañón Bocio Relaciones diplomáticas hispanoestadounidenses Radioiodine Endocrinology Spain Goitre US-Spanish diplomatic relations This paper is a history of iodine. To trace the trajectory of this element, goiter is used as a guideline for the articulation of a historical account, as a representation of thyroid disorders and of the spaces of knowledge and practices related to iodine. Iodine’s journey from goiter treatment and prophylaxis in the late interwar period took on a new course after WWII by including the element’s radioactive isotopes. I intend to show how the introduction of radioiodine contributed to stabilize the epistemic role of iodine, in both its non-radioactive and radioactive form, in thyroid gland studies and in the treatment of its disorders. 2022-10-26T08:14:59Z 2022-10-26T08:14:59Z 2009 journal article Santesmases, María Jesús. «From prophylaxis to atomic cocktail : circulation of radioiodine». Dynamis: Acta Hispanica ad Medicinae Scientiarumque Historiam Illustrandam, 2009, Vol. 29, p. 337-364, https://raco.cat/index.php/Dynamis/article/view/136840. 0211-9536 https://hdl.handle.net/10481/77564 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Universidad de Granada