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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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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Candidates for leadership provide statements: ANS Board of Directors
With the annual ANS election right around the corner, American Nuclear Society members will be going to the polls to vote for a vice president/president-elect, treasurer, and members-at-large for the Board of Directors. In January, Nuclear News published statements from candidates for vice president/president-elect and treasurer. This month, we are featuring statements from each nominee for the Board of Directors.
Dale M. Holm, W. Mort Sanders
Nuclear Technology | Volume 3 | Number 5 | May 1967 | Pages 308-313
Technical Paper and Note | doi.org/10.13182/NT67-A27890
Articles are hosted by Taylor and Francis Online.
In activation analysis with photons and charged particles, the activities of positron-emitting reaction products are determined by unfolding complex decay curves obtained from a pair of coincidence detectors. Certain interfering reaction products emit a high-energy gamma ray coincident with the positron, and the signal from these was distinguished from the signal from pure positron emitters by collecting a 0.51-MeV annihilation photon in one detector and the other 0.51-MeV annihilation photon plus the high-energy gamma ray in the other detector. Since the improvement in sensitivity is directly related to the interference removal, which increases with the probability of detecting the associated gamma ray, high efficiency was required. The method is illustrated by a photon activation analysis experiment in which oxygen was measured in sodium. The activation product, 15O, is the signal and 22Na and 38K are the interference reaction products. Experiments show that a large (8-in.-diam. × 12-in.-long) “well” detector will give five-fold sensitivity improvement over a 2.3- × 6-in. detector when each is in coincidence with a 2- × 2-in. detector. A time sequence of coincidence-gated spectra was taken, and the counts in specified energy increments were determined. Composite decay curves were constructed and unfolded into components. The large detector causes counts from the interference reaction products which would appear in the 0.57-MeV annihilation peak to appear in the higher energy portion of the spectrum because of the high probability of collecting additional energy from the associated gamma rays.
