211At

211At is the designation for the isotope of astatine with a mass number of 211. Astatine is a chemical element with the symbol At and atomic number 85. It is a very rare radioactive element that exists in nature only in trace amounts as a decay product of heavier elements. 211At is primarily produced artificially through nuclear reactions.

The decay properties of 211At are of significant interest, particularly in the field of nuclear medicine. It undergoes alpha decay with a half-life of approximately 7.2 hours, transforming into bismuth-211. Bismuth-211 then decays further through alpha or beta emission. This alpha decay releases a relatively high-energy particle, which can be utilized for targeted radiotherapy. Due to its decay characteristics, 211At has been investigated for use in targeted alpha therapy (TAT), a type of cancer treatment where radioactive isotopes are attached to molecules that specifically bind to cancer cells, delivering a localized dose of radiation to destroy them while minimizing damage to surrounding healthy tissues.

The production of 211At typically involves bombarding bismuth targets with alpha particles or protons in a cyclotron. Due to its short half-life and the complexity of its production, 211At is not widely available and is primarily used in research settings and specialized clinical trials. Its application in medicine is a promising area of ongoing research.