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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
Fusion Science and Technology
July 2025
Latest News
Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Stephen M. Goldberg, Manson Benedict, Hans W. Levi
Nuclear Science and Engineering | Volume 47 | Number 2 | February 1972 | Pages 169-186
Technical Paper | doi.org/10.13182/NSE72-A22394
Articles are hosted by Taylor and Francis Online.
Equations, tables, and charts are given which represent the equilibrium distribution of uranyl nitrate and nitric acid between aqueous solution and an organic phase consisting of 30 vol% tributyl phosphate (TBP) in a hydrocarbon diluent at 25°C. These should be useful for prediction of distribution equilibria in the Purex solvent extraction process for recovering uranium from irradiated nuclear fuel. Equations for the aqueous phase represent the activities of water, nitric acid, and uranyl nitrate hexahydrate as functions of the molality of the last two components. These equations were developed by correlating data for the partial pressure of nitric acid over aqueous solutions of nitric acid and uranyl nitrate. Distribution equilibrium data for uranyl nitrate are correlated by an equation representing the ratio of the activity coefficient of the uranyl nitrate-TBP complex to the activity coefficient of uncomplexed TBP as a function of the uranyl nitrate and nitric acid content of the organic phase. This equation was fitted to distribution data for uranyl nitrate observed in the presence of nitric acid and in the absence of nitric acid. The observed molality of uranyl nitrate in the organic phase agrees with the molality predicted by this equation within an average deviation of 5.8%. Distribution equilibrium data for nitric acid in the presence of uranyl nitrate were correlated in analogous fashion.