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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!
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Latest News
Inkjet droplets of radioactive material enable quick, precise testing at NIST
Researchers at the National Institute of Standards and Technology have developed a technique called cryogenic decay energy spectrometry capable of detecting single radioactive decay events from tiny material samples and simultaneously identifying the atoms involved. In time, the technology could replace characterization tasks that have taken months and could support rapid, accurate radiopharmaceutical development and used nuclear fuel recycling, according to an article published on July 8 by NIST.
H. L. McMurray, A. V. Grimaud, G. H. Hanson
Nuclear Science and Engineering | Volume 3 | Number 1 | January 1958 | Pages 38-46
Technical Paper | doi.org/10.13182/NSE58-A25444
Articles are hosted by Taylor and Francis Online.
An expression for the charge life of a reactor is derived in terms of a model which assumes that enough uniformly distributed poison is always present to keep the reactor critical with control rods withdrawn. The burnout distribution is assumed to be constant and to be the same as at the end of the run, or to follow the calculated thermal flux distribution. Two group perturbation theory expressions for reactivity changes due to fuel burnout and uniform poison removal may then be equated and integrated under plausible simplifying restrictions to yield an expression for charge life in terms of calculable, or measurable quantities.
