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
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
The RAIN scale: A good intention that falls short
Radiation protection specialists agree that clear communication of radiation risks remains a vexing challenge that cannot be solved solely by finding new ways to convey technical information.
Earlier this year, an article in Nuclear News described a new radiation risk communication tool, known as the Radiation Index, or, RAIN (“Let it RAIN: A new approach to radiation communication,” NN, Jan. 2025, p. 36). The authors of the article created the RAIN scale to improve radiation risk communication to the general public who are not well-versed in important aspects of radiation exposures, including radiation dose quantities, units, and values; associated health consequences; and the benefits derived from radiation exposures.
Charles W. Forsberg
Nuclear Technology | Volume 49 | Number 2 | July 1980 | Pages 243-252
Nuclear Fuel Cycle | Fuel Cycle | doi.org/10.13182/NT80-A32487
Articles are hosted by Taylor and Francis Online.
The separation of americium, curium, and the rare earths from high-level wastes by precipitation with oxalic acid was experimentally investigated using synthetic waste solutions and rare earths as chemical stand-ins for americium and curium. Americium, curium, and the rare earths have almost identical chemical properties; hence, practical methods for recovering americium and curium from waste streams are based on two-step procedures in which the first step separates americium, curium, and the rare earth elements from other fission products. In this study, several parameters were investigated over a limited range in continuous-flow experiments (<60 cm3/min) to determine their effect on oxalate precipitation from synthetic waste solutions. Best results were obtained by mixing the waste solution and oxalic acid in one stirred-tank reactor (STR), allowing the oxalate crystals in the resulting slurry to grow in a second identical STR in series with the first reactor, and then separating the solids and liquids by settling or filtration. Yields >90% were regularly obtained. Optimum operating conditions over the range investigated were: liquid residence time per chemical reactor, ≥40 min; final oxalic acid concentration, ≥0.3 M; reactor temperature, ≤25°C; and STR No. 2, stirrer power equal to 0.18 W/ℓ. The stirrer power to the first STR was not found to be an important variable over the range investigated. The experimental results indicate that continuous precipitation of oxalates of trivalent actinides and lanthanides may be feasible. Additional experimental work will be required to determine whether continuous oxalate precipitation is feasible at the high-radiation levels associated with actual high-level wastes.