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Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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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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Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
M. Sharpe, C. Fagan, W. T. Shmayda
Fusion Science and Technology | Volume 75 | Number 8 | November 2019 | Pages 1053-1057
Technical Paper | doi.org/10.1080/15361055.2019.1644136
Articles are hosted by Taylor and Francis Online.
The distribution of tritium in the near surface of Type 316 stainless steel has been measured using a combination of a zinc chloride (ZnCl2) wash and acid etching with diluted aqua regia. This method improves upon etching measurements reported in the literature: Results show depth resolutions of ~10 nm using the diluted aqua regia. The ZnCl2 wash results show very high surface concentration (~1.5 × 1013 Bq/cm3), which decreases by a factor of 106 after etching to a depth of ~10 μm. Further, the tritium concentrations in the near surface (<10 μm) of unmodified stainless steel samples do not change significantly over the course of 233 days, which indicates a quasi-equilibrium state has been reached. Tritium migration to the surface from the subsurface region was measured by etching a sample and then storing it in air for 2 to 4 days. After storing in air, the surface concentrations increased a thousandfold and rapidly decreased to base levels after etching an additional ~2 μm. These measurements indicate that perturbing the quasi-equilibrium concentration profile results in tritium migration to the surface in order to reestablish the prior equilibrium state.