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Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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!
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Latest News
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
Weston M. Stacey, Jr.
Nuclear Science and Engineering | Volume 44 | Number 2 | May 1971 | Pages 194-203
Technical Paper | doi.org/10.13182/NSE71-A19668
Articles are hosted by Taylor and Francis Online.
The effect of anisotropic (CM) elastic scattering upon neutron moderation has been investigated. Relations between the Legendre moments of the angular scattering data (CM) and the moderating parameters of the Greuling-Goertzel (GG) and improved (IGG) theories are given, and it is shown theoretically and numerically that only the first few Legendre moments contribute significantly to the moderating parameters of the P0 (lab) theory. In general, anisotropic scattering is shown to reduce dramatically the moderating effectiveness of a material, and to produce oscillations (in energy) in the neutron flux. Numerical examples for isotopes and mixtures representative of postulated fast breeder reactors are given to illustrate quantitatively the effect of anisotropic scattering.
