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
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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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August 2024
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.
Tadashi Yoshida
Nuclear Science and Engineering | Volume 63 | Number 4 | August 1977 | Pages 376-390
Technical Paper | doi.org/10.13182/NSE77-A27055
Articles are hosted by Taylor and Francis Online.
The gross theory of beta decay developed by Takahashi and Yamada has been applied to an estimation of nuclear decay heat of short-lived fission products, that is, to the average energies of emitted beta particles and gamma rays and the half-lives. For short-lived fission products for which no experimental information is available, calculations have been performed with the most probable value of a parameter Q00, which represents the energy of the lowest level actually fed by the beta transition. The results have been summarized in the form of several simple formulas, which are functions of the Q value and mass number of the nuclide in question. When the half-life is determined experimentally, the certainty of the calculated results for the average released energies can be improved by means of a search for the best Q00 value based on the measured half-life for each nuclide. Evaluation of confidence bands is also performed for the calculated results.