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
Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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
Apr 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
May 2024
Nuclear Technology
Fusion Science and Technology
Latest News
NRC updating GEIS rule for new nuclear technology
The Nuclear Regulatory Agency is issuing a proposed generic environmental impact statement (GEIS) for use in reviewing applications for new nuclear reactors.
In an April 17 memo, NRC secretary Carrie Safford wrote that the commission approved NRC staff’s recommendation to publish in the Federal Register a proposed rule amending 10 CFR Part 51, “Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions.”
David Maxwell Barton
Nuclear Science and Engineering | Volume 33 | Number 1 | July 1968 | Pages 51-55
Technical Paper | doi.org/10.13182/NSE68-A20917
Articles are hosted by Taylor and Francis Online.
Central reactivity contributions of gram-sized samples of 244Cm, 239Pu, and 235U have been obtained in a fast critical assembly of bare 239Pu in a spherical geometry. Resulting values are: 244Cm = (1276 ± 5%) cents/g at.; 239Pu = (1393 ± 3%) cents/g at.; 235U = (701 ± 2%) cents/g at. From these data, the critical mass of a bare sphere of 244Cm is estimated to be (27.7 ± 2.5) kg at a density of 13.5 g/cm3.
