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Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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August 2024
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Latest News
Military action destroys radiation monitor at Ukraine plant
An external radiation monitoring station was taken out by shelling and fire near the Zaporizhzhia nuclear plant in Ukraine the last week of June.
This brings the total to four of the plant’s 14 radiation monitoring sites that are out of commission, further reducing the effectiveness of its off-site capability to detect and measure any radioactive release during an emergency, said IAEA director general Rafael Mariano Grossi.
H. Alan Robitaille, John S. Hewitt
Nuclear Science and Engineering | Volume 63 | Number 4 | August 1977 | Pages 391-400
Technical Paper | doi.org/10.13182/NSE77-A27056
Articles are hosted by Taylor and Francis Online.
The spectrum of neutrons in thermal pseudo-equilibrium with a mixture of partially hydrogenated terphenyls and high-boiling polymers, an organic material known commercially as HB40, has been measured at room temperature. The spectrum was measured in each of seven mixtures of HB40 and a thermal-neutron absorber, trimethyl borate, in various concentrations. The spectra were determined by the time-of-flight method using the University of Toronto linear electron accelerator as a pulsed source of fast neutrons. These spectra were compared with those calculated using several different bound-hydrogen approximations to the actual energy transfer kernel for the mixture. Of these approximations, the best agreement between theory and experiment occurred for a scattering kernel derived using the diphenyl and the polyethylene scattering kernels, combined according to a weighting scheme reflecting the degree of hydrogenation of the organic material.