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
No impact from Savannah River radioactive wasps
The news is abuzz with recent news stories about four radioactive wasp nests found at the Department of Energy’s Savannah River Site in South Carolina. The site has been undergoing cleanup operations since the 1990s related to the production of plutonium and tritium for defense purposes during the Cold War. Cleanup activities are expected to continue into the 2060s.
R. T. Jones, J. S. Merritt, A. Okazaki
Nuclear Science and Engineering | Volume 93 | Number 2 | June 1986 | Pages 171-180
Technical Paper | doi.org/10.13182/NSE86-A17666
Articles are hosted by Taylor and Francis Online.
The thermal neutron capture cross section of 232Th has been measured relative to that of 197Au. Foils of gold, thorium metal, and thoria were irradiated together in the NRU reactor thermal column. The 198Au activity was assayed in a 4πγ ionization chamber, which had been previously calibrated with samples of 198Au standardized by the 4π Β-γ coincidence method. Protactinium-233 sources were also standardized by this method. Comparison of these sources with the irradiated thorium, by means of a Ge(Li) spectrometer, enabled the 233Pa activity in the thorium-bearing foils to be determined. Taking the 2200 m/s capture cross section of 197Au to be 98.8 b, that of 232Th is found to be 7.33 ± 0.06 b. The uncertainty is at the 95% confidence level and includes an estimate of the systematic uncertainties.