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
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Aug 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Chris Wagner: The role of Eden Radioisotopes in the future of nuclear medicine
Chris Wagner has more than 40 years of experience in nuclear medicine, beginning as a clinical practitioner before moving into leadership roles at companies like Mallinckrodt (now Curium) and Nordion. His knowledge of both the clinical and the manufacturing sides of nuclear medicine laid the groundwork for helping to found Eden Radioisotopes, a start-up venture that intends to make diagnostic and therapeutic raw material medical isotopes like molybdenum-99 and lutetium-177.
G. Flamenbaum, R. de Wouters, A. Le Bourhis, T. Newton, G. Vambenepe
Nuclear Science and Engineering | Volume 106 | Number 1 | September 1990 | Pages 11-17
Technical Paper | doi.org/10.13182/NSE90-A23752
Articles are hosted by Taylor and Francis Online.
The loading of the Superphénix core took place between July 20 and October 3, 1985. The loading of the first core, involving 5.7 tonnes of plutonium, employed a new strategy in the pattern of fuel/dummy assembly replacement moves, known as the checkerboard pattern. This pattern proved highly satisfactory; significant counting rates were obtained on the low-power chambers early in the loading; overall loading time was reduced; and the interpretation of measurements was facilitated., The results were in good agreement with precalculated values, which were reconfirmed by a further, more detailed interpretation that took into account the actual conditions at the time of the reload. The reactivity differences between calculated and measured values for the first critical core loading (containing 33 dummy assemblies) and the fully loaded power core were –0.12 and –0.02% A k/k, respectively. This agreement between experimental and calculated values demonstrates the satisfactory performance of the data sets and methods used in the analysis.