ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
T. H. SPRINGER AND S. G. CARPENTER.
Nuclear Science and Engineering | Volume 17 | Number 2 | October 1963 | Pages 194-199
Technical Paper | doi.org/10.13182/NSE63-A28879
Articles are hosted by Taylor and Francis Online.
A preliminary measurement of the Doppler effect in metallic thorium has been made in a fast neutron energy spectrum. The effect has been investigated up to slug temperatures of 500°C by an oscillator technique in which sensitivities on the order of 2 × 10-8 Δk/k can be attained with reasonable ease. The observed reactivity changes appear at this time to result largely from Doppler broadening of the resonances. This conclusion is supported by the fact that several, well-recognized correction terms have been found to be unimportant under the present circumstances. Based on a straight-line approximation to the measured points, the value of (1/ρ)(dρ/dT) was found to be 7.18 × 10-5/°C.
