ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Kiyoshi Yoshikawa, Yasushi Yamamoto, Hisayuki Toku, Akira Kobayashi, Toru Okazaki
Fusion Science and Technology | Volume 15 | Number 4 | July 1989 | Pages 1541-1559
Technical Paper | Energy Storage, Switching, and Conversion | doi.org/10.13182/FST89-A25343
Articles are hosted by Taylor and Francis Online.
A 5-yr study of beam direct energy conversion was performed at the Kyoto University Institute of Atomic Energy to clarify the essential features of direct energy recovery from monoenergetic ion beams so that the performance characteristics of energy recovery can be predicted reasonably well by numerical calculations. The study used an improved version of an electrostatically electron-suppressed beam direct converter originally proposed by Lawrence Livermore National Laboratory. Secondary electron suppressor grids were added, and a helium ion beam was used with typical parameters of 15.4 keV, 90 mA, and 100 ms. By adopting negatively biased secondary electron suppressor grids, the energy recovery efficiency increased from 72 ± 4 to 87 ± 6% even at relatively high pressures of 10−2 Pa, based on three independent measurements of the incident ion current, including a newly developed “in situ” measurement by a Rogowski coil sensor. The operational region could also be extended to more high-pressure regions. A comparison of experimental results with numerical results by the two-dimensional Kyoto University Advanced DART (KUAD) code, including evaluation of atomic processes, shows excellent agreement. Adoption of the mesh-type electron suppressor instead of the solid suppressor results in further improvements in the beam direct energy recovery.
