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
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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
Sep 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
October 2025
Latest News
Empowering the next generation: ANS’s newest book focuses on careers in nuclear energy
A new career guide for the nuclear energy industry is now available: The Nuclear Empowered Workforce by Earnestine Johnson. Drawing on more than 30 years of experience across 16 nuclear facilities, Johnson offers a practical, insightful look into some of the many career paths available in commercial nuclear power. To mark the release, Johnson sat down with Nuclear News for a wide-ranging conversation about her career, her motivation for writing the book, and her advice for the next generation of nuclear professionals.
When Johnson began her career at engineering services company Stone & Webster, she entered a field still reeling from the effects of the Three Mile Island incident in 1979, nearly 15 years earlier. Her hiring cohort was the first group of new engineering graduates the company had brought on since TMI, a reflection of the industry-wide pause in nuclear construction. Her first long-term assignment—at the Millstone site in Waterford, Conn., helping resolve design issues stemming from TMI—marked the beginning of a long and varied career that spanned positions across the country.
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.
