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.
Explore membership for yourself or for your organization.
Conference Spotlight
2026 Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
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
Nov 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
December 2025
Nuclear Technology
November 2025
Fusion Science and Technology
Latest News
Industry Update—November 2025
Here is a recap of recent industry happenings:
TerraPower’s Natrium plans for Wyoming, Utah move forward
TerraPower has reported a number of developments related to its Natrium sodium fast reactor project. In the project’s fifth round of procurement awards, the company awarded three supplier contracts to support the Natrium plant’s construction, which is underway in Kemmerer, Wyo., and is expected to be completed in 2030. AvanTech will design advanced sodium processing system modules and supporting skids for the Natrium plant, as well as fabricate and deliver the test and fill facility cold trap skid. Structural Integrity Associates will design and fabricate the sodium cover gas gamma spectroscopy analysis cabinet, a radiation monitoring system. PAR Systems will design and fabricate the pool handling machine, a specialized crane system for spent fuel pool operations.
J. F. Widder
Nuclear Science and Engineering | Volume 60 | Number 1 | May 1976 | Pages 53-61
Technical Paper | doi.org/10.13182/NSE76-A26857
Articles are hosted by Taylor and Francis Online.
Absolute neutron-capture cross-section measurements from 0.01 to 10 eV employing a Moxon-Rae detector and conventional time-of-flight techniques are described. For the calculation of multiple-scattering and gamma-ray attenuation effects in samples, new improved methods were developed. Cross-section curves were evaluated for the elements europium and lutetium as well as for the isotopes 151Eu, 153Eu, 175Lu, and 176Lu. The cross sections could be determined to an accuracy of better than 5%; however, for some resonance cross sections the total error increases up to 10%.
