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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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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ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
T. Shimooke
Nuclear Science and Engineering | Volume 37 | Number 3 | September 1969 | Pages 343-357
Technical Paper | doi.org/10.13182/NSE69-A19111
Articles are hosted by Taylor and Francis Online.
The phenomenon of neutron focusing by a totally reflecting conical tube is studied in terms of the focused neutron currents, the spectrum shift, and the gains in beam intensity and in increasing the reaction rate of a 1/v absorber. The influence of the source temperature, the angular spread of the source flux, the geometrical variations of the conical pipe, and the reflectivity are considered. Two different approximate formulations on the focused neutrons in a reflecting tube are established for the purpose of carrying out the numerical calculations. The formulation allows detailed calculations on each order of multiple reflection, taking the tube geometry into consideration. The analysis shows that relatively strongly focused neutron currents are attainable under proper conditions by means of a “focalizer,” a reflecting conical tube. The uses of a multistage focalizer are also suggested, showing examples where both intensity and a 1/v absorption rate in an exposed sample can be enhanced.