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
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
Meeting Spotlight
2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott 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
Jun 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
July 2025
Nuclear Technology
Fusion Science and Technology
Latest News
Smarter waste strategies: Helping deliver on the promise of advanced nuclear
At COP28, held in Dubai in 2023, a clear consensus emerged: Nuclear energy must be a cornerstone of the global clean energy transition. With electricity demand projected to soar as we decarbonize not just power but also industry, transport, and heat, the case for new nuclear is compelling. More than 20 countries committed to tripling global nuclear capacity by 2050. In the United States alone, the Department of Energy forecasts that the country’s current nuclear capacity could more than triple, adding 200 GW of new nuclear to the existing 95 GW by mid-century.
P. Thomas, K. Nester
Nuclear Technology | Volume 68 | Number 3 | March 1985 | Pages 293-310
Technical Paper | Nuclear Safety | doi.org/10.13182/NT85-A33576
Articles are hosted by Taylor and Francis Online.
Experiments were carried out at the Karlsruhe Nuclear Research Center to determine the atmospheric diffusion of pollutants. The influence on atmospheric diffusion by conditions specific to the site was investigated. For this purpose, tritiated water and two different halogenated hydrocarbons are emitted at heights of 60 and 100 m; their local concentration distribution is measured at ground level downwind of the source. The relevant meteorological data are measured at a 200-m-high tower. For evaluation of the measurements the diffusion is assumed to be a steady-state process. A twodimensional Gaussian distribution is used as the theoretical approximation of the concentrations. The dependence of the dispersion parameters σy and σz on the downwind distance is described by a power function. A least-squares fit is applied to calculate the horizontal and vertical dispersion parameters and the normalized diffusion factor from the measured wind velocity, emission rate, and concentration distribution. The errors in the calculated parameters are also determined. The dispersion parameters evaluated are assigned to stability classes by the measured standard deviation of the vertical wind direction.
