Americium-241 (241Am)

Americium-241 is a radioactive isotope of the transuranic element americium, primarily generated as a decay product of plutonium-241 [1]. It is not a biological therapeutic target such as a receptor or enzyme; rather, it is classified as a potent radiotoxicant and environmental contaminant [1, 3]. Upon internalization through inhalation or ingestion, americium-241 behaves as a bone-seeker, depositing predominantly on mineral bone surfaces and in the liver, where it remains for decades [1, 2]. The primary health hazard stems from its emission of high-energy alpha particles, which cause intense localized ionizing radiation damage, significantly increasing the risk of bone cancer (osteosarcoma) and liver disease [1, 3]. Pharmacological management of internal contamination involves decorporation therapy using chelating agents like Pentetate calcium trisodium (Ca-DTPA) and Pentetate zinc trisodium (Zn-DTPA) [2]. These agents bind to the americium ions in the blood and extracellular fluid to facilitate their renal excretion, thereby reducing the total radiation dose to the patient [2]. Sources: [1] Agency for Toxic Substances and Disease Registry (ATSDR) Toxicological Profile for Americium; [2] FDA Guidance on Ca-DTPA and Zn-DTPA; [3] EPA Radionuclide Basics: Americium-241.

Other names

Am-241241-AmAmericium isotopeRadioactive americium

Chelation of metal ions to form stable, water-soluble complexes that are subsequently excreted from the body via the kidneys [2].