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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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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Latest News
Wright officially sworn in for third term at the NRC
The Nuclear Regulatory Commission recently announced that David Wright, after being nominated by President Trump and confirmed by the Senate, was ceremonially sworn in as NRC chair on September 8.
This swearing in comes more than a month after Wright began his third term on the commission; he began leading as chair July 31. His term will conclude on June 30, 2030.
R. A. Aikens, Y. Jia, Z. W. Lin
Nuclear Technology | Volume 175 | Number 1 | July 2011 | Pages 146-149
Technical Paper | Special Issue on the 16th Biennial Topical Meeting of the Radiation Protection and Shielding Division / Radiation Transport and Protection | doi.org/10.13182/NT11-A12283
Articles are hosted by Taylor and Francis Online.
We use the Geant4 Monte Carlo code to study the angular dependences of different radiation particles on the lunar surface in the 1977 solar minimum galactic-cosmic-ray environment when there is no habitat. In particular, we study the anisotropy of albedo particles on the lunar surface. We find that albedo particles are in general not isotropic in the upper hemisphere, and for neutrons or photons the deviations from isotropy at lower energies have opposite signs as those at higher energies. In terms of fluence rates, deviations from the corresponding isotropic fluence rate, i.e., the rate if the particles were isotropic in a hemisphere, range from -8% for albedo neutrons up to +58% for albedo protons. Results on other albedo particles such as electrons, positrons, photons, and charged pions are also presented.