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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.
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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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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.
Hiroshi Takahashi
Nuclear Science and Engineering | Volume 51 | Number 3 | July 1973 | Pages 296-315
Technical Paper | doi.org/10.13182/NSE73-A26607
Articles are hosted by Taylor and Francis Online.
The gamma-ray spectra produced by neutron-induced 238U reactions are analyzed, primarily using the statistical model, to provide the data for gamma-ray heating and shielding in the nuclear reactor. The gamma-ray spectra in the low energy neutron capture were calculated by taking into account the discrete and the continuous energy levels, and E1, M1, E2, and M2 electromagnetic transitions. The transition probabilities for primary gamma rays were taken from the data of Price et al. The calculated data are compared with John’s experimental data and Yost’s calculations. To calculate the gamma-ray spectra due to inelastic neutron scattering, the E2 and M1 transitions of the lowest 13 discrete levels of 238U were calculated by using the rotational vibrational model of Bohr-Mottelson. The gamma production cross section due to fast-neutron reactions (En > 2 MeV) and the prompt gamma-ray spectrum due to fission were calculated by taking into account the yrast levels in the cascade process, as proposed by Thomas and Grover. The calculated prompt gamma-ray spectrum and the total gamma-ray production cross section are discussed in comparison with the experimental data.