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Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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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Latest News
ANS designates Armour Research Foundation Reactor as Nuclear Historic Landmark
The American Nuclear Society presented the Illinois Institute of Technology with a plaque last week to officially designate the Armour Research Foundation Reactor a Nuclear Historic Landmark, following the Society’s decision to confer the status onto the reactor in September 2024.
Alan B. Rothman, Charles E. W. Ward
Nuclear Science and Engineering | Volume 12 | Number 2 | February 1962 | Pages 293-300
Technical Paper | doi.org/10.13182/NSE62-A26070
Articles are hosted by Taylor and Francis Online.
A new measurement of the effective resonance integral of thorium metal has been made, using reactor oscillator techniques. Fluctuations in reactor power level, caused by oscillation of cadmium-shielded cylindrical samples, were recorded on a strip chart. The signal was Fourier-analyzed, and the coefficient of the fundamental mode determined. For a constant shape reactivity input, the value of this coefficient for each sample is proportional to the effective resonance integral of the sample. The scattering effects of the thorium were determined by oscillating identical samples of lead, and were deducted from the results for the thorium. Absolute calibration of the oscillator measurements was provided by oscillating several dilute solutions of each of three standard absorbers : boron, indium, and gold. The effective resonance integrals of the thorium cylinders were then found to be given by the formula: where S/M is the surface-to-mass ratio of the samples in cm2/gm. The 1/v component of the resonance integral, 3.6 barns, has been removed from the first term of this formula.
