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Division Spotlight
Young Members Group
The Young Members Group works to encourage and enable all young professional members to be actively involved in the efforts and endeavors of the Society at all levels (Professional Divisions, ANS Governance, Local Sections, etc.) as they transition from the role of a student to the role of a professional. It sponsors non-technical workshops and meetings that provide professional development and networking opportunities for young professionals, collaborates with other Divisions and Groups in developing technical and non-technical content for topical and national meetings, encourages its members to participate in the activities of the Groups and Divisions that are closely related to their professional interests as well as in their local sections, introduces young members to the rules and governance structure of the Society, and nominates young professionals for awards and leadership opportunities available to members.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
C. David Livengood, C. Keith Paulson, H. E. Hungerford
Nuclear Science and Engineering | Volume 52 | Number 2 | October 1973 | Pages 254-266
Technical Paper | doi.org/10.13182/NSE73-A28194
Articles are hosted by Taylor and Francis Online.
Experimental techniques previously used for measuring neutron spectra in fast critical assemblies have been applied to reactor shielding problems. Fast-neutron spectra in the energy range from 25 keV to 1 MeV have been measured in the water shield surrounding a small thermal research reactor. Three different water thicknesses were investigated, as well as a combination of water with a 2-in.-thick slab of iron. The spectrometer system developed for these measurements employs small proton-recoil proportional counters, together with electronic pulse-shape discrimination for the rejection of gamma-ray signals. Since this discrimination is extremely important for shielding measurements, the detectors and electronic system are described in some detail. The basic theory underlying proton-recoil measurements of neutron spectra is reviewed, as well as the techniques used to correct for errors arising due to finite detector size and irregularities in the electric field within the counters. Results of the water measurements indicate that the spectrometer is capable of measuring the absolute neutron flux as well as relative variations within the spectrum at a given point. In addition, predictions of spectral hardening with increasing water thickness are verified. The water-iron measurements indicate that the system is capable of measuring spectral features caused by resonances in the cross section of the shield material.