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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.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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!
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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.”
Y. S. Na, W. Lee, S. Song
Nuclear Technology | Volume 206 | Number 4 | April 2020 | Pages 544-553
Technical Paper | doi.org/10.1080/00295450.2019.1657328
Articles are hosted by Taylor and Francis Online.
This study observed the breakup of helium stratification, which was 30 vol % helium in air and formed in the upper part of a cylindrical test vessel with a height of 9.5 m and a diameter of 3.4 m. An air jet collided with the density interface on which the restoring buoyancy of the helium and the disturbing inertial force of the impinging jet were balanced. The Reynolds number of the jet was about 20 000 at the exit of a vertical pipe located 3.0 m below the initial stratification. The helium concentration was measured by sampling the gas mixture with thermal conductivity analyzers. Particle image velocimetry (PIV) visualized the flow field of the jet impinging on the density interface. The density interface was clearly shown by the binary images generated from the number of tracer particles for the PIV. From the continuous impinging jet, the density interface gradually moved upward. The interaction Froude number, which was defined by the ratio of the inertial force of the impinging jet to the buoyancy of a light gas on the density interface, was about unity calculated by the helium concentration and the flow visualization. The density interface went up to 0.0002 m/s.