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
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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
June 2025
Nuclear Technology
Fusion Science and Technology
May 2025
Latest News
Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
E. E. Morris
Nuclear Science and Engineering | Volume 59 | Number 3 | March 1976 | Pages 246-260
Technical Paper | doi.org/10.13182/NSE76-A26823
Articles are hosted by Taylor and Francis Online.
The energy-dependent neutron flux has been calculated for a point-isotropic fission source as a function of distance from the source in an infinite medium of sodium. The results were obtained by the moments method. Energy spectra are presented graphically for five distances from the source between 0 and 8 m and for energies between 1 eV and 15 MeV. Error estimates due to causes other than cross-section uncertainties or interpolations are made. The calculations are compared with a previously reported Monte Carlo calculation and with experimental measurements. Satisfactory agreement is observed.
