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  • halogen
  • Astatine-211 ( 211 At) is an alpha particle emitting halogen with almost optimal linear energy transfer for creating DNA double-strand breaks and is thus proposed for radionuclide therapy when bound to tumor-seeking agents. (springeropen.com)
  • periodic
  • The successful measurement fills a long-standing gap in Mendeleev's periodic table, since astatine was the last element present in nature for which this fundamental property was unknown. (york.ac.uk)
  • rarest
  • An international team of scientists, including a University of York researcher, has carried out ground-breaking experiments to investigate the atomic structure of astatine (Z=85), the rarest naturally occurring element on Earth. (york.ac.uk)
  • amounts
  • Though Argonne provides him the tiny amounts of astatine he needs for in-house work, Atcher says, one of his colleagues at the University of Pittsburgh could never get enough astatine to prove or disprove the therapy's potential" -- even though he had a grant for a human trial. (thefreedictionary.com)
  • metallic
  • Astatine is sometimes described as probably being a black solid (assuming it follows this trend), or as having a metallic appearance (if it is a metalloid or a metal). (wikipedia.org)
  • thyroid
  • The book also explains the biological behavior of astatine that accumulates in the liver or in the thyroid gland depending on the method of administration either as a radiocolloid or as a true solution. (elsevier.com)
  • found
  • Also the ionization threshold of astatine was found by scanning the wavelength of ionizing UV laser. (york.ac.uk)
  • A second phase of the study of the atomic spectrum of astatine took place at the ISAC radioactive isotope facility of the Canadian national laboratory for particle and nuclear physics TRIUMF in Vancouver, where new optical transitions in the infrared region of spectrum were found. (york.ac.uk)
  • With the newly found transitions a highly efficient three-step ionization scheme of astatine was defined and used at ISOLDE RILIS for further study of astatine spectrum. (york.ac.uk)
  • highly
  • However, like typical metals, astatine precipitates with hydrogen sulfide even from a highly acidic solution, it is displaced by zinc from sulfuric acid solutions, and it precipitates at the cathode during electrolysis. (thefreedictionary.com)