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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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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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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.
Farno L. Green, John A. Martin
Nuclear Science and Engineering | Volume 7 | Number 4 | April 1960 | Pages 387-391
Technical Paper | doi.org/10.13182/NSE60-A25733
Articles are hosted by Taylor and Francis Online.
The radioisotopes Mn54, I125, and I130 were produced at higher rates and at lower cost when targets of isotopically enriched Cr54, Te125, and Te130 were bombarded with protons in the ORNL 86-Inch Cyclotron. The product isotopes were carrier-free and also relatively free of undesired radioisotopes. The use of enriched isotopes as cyclotron targets is economically attractive when the target material can be recovered and reused. To obtain the maximum production rate for radioisotopes in a cyclotron, both the usable beam power and the excitation function of the nuclear reaction must be considered; in some cases the maximum rate is achieved at a reduced energy. With the ORNL 86-Inch Cyclotron, (p, n) reaction production rates were increased by a factor of 1.7 by decreasing the proton energy from 22 to 18 Mev and doubling the output current. Methods of reducing the energy below the maximum design value are discussed.
