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
Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
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.”
Ely M. Gelbard
Nuclear Science and Engineering | Volume 54 | Number 3 | July 1974 | Pages 327-340
Technical Paper | doi.org/10.13182/NSE74-A23423
Articles are hosted by Taylor and Francis Online.
Diffusion coefficients are computed for a typical lattice cell of the zero-power plutonium reactor experiments using the methods of Benoist and Bonalumi. It is noted that the diffusion coefficients, Dx, for leakage normal to the plates, as defined by Benoist and by Bonalumi, are both double valued. The spread between Benoist’s x-diffusion coefficient is, in the lattice cell, over half as large as the difference between Dx and Dy. Bonalumi’s x-diffusion coefficients are much farther apart, the interval between them being considerably larger than the difference between Dx and Dy. Neither the Benoist nor the Bonalumi method yields homogenized diffusion coefficients that preserve fluxes, reaction rates, or eigenvalues. Using an approach similar to that of Deniz, the diffusion coefficient is redefined and constructed in such a way as to guarantee that eigenvalues will be preserved in the homogenization process. The relation between the new diffusion coefficients and the Benoist coefficients is discussed.