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Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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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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Nicholas Tsoulfanidis—ANS member since 1969
As an undergraduate I studied physics at the University of Athens. I entered the university in 1955 after successfully passing a national exam (came up fourth in a field of about 700 candidates). Upon graduation and finishing my mandatory two-year military service, the plan was to teach physics either in a public high school or as a tutor for a private for-profit institution, preparing high school students for the national exam.
A. Y. K. Chen, T. Yoshida, T. Tanabe
Nuclear Science and Engineering | Volume 150 | Number 3 | July 2005 | Pages 349-356
Technical Paper | doi.org/10.13182/NSE05-A2521
Articles are hosted by Taylor and Francis Online.
The authors have proposed a technique using special metal structures to efficiently convert gamma rays to low-energy electrons, with possible applications such as detoxification of water and hydrogen production using gamma rays from radioactive waste. The present study employed the Monte Carlo N-Particle (MCNP) transport code to understand in detail the mechanisms of low-energy photon and electron generation from gamma rays in water vessels containing various metal structures. The study demonstrated that the amount of low-energy electrons in water generally increases with (a) the Z number of the metal, (b) the volume of the metal, (c) the ability of low-energy electrons to escape from the metal and into the water region, (d) the closeness with adjacent metal plates, and (e) the ability of metal plates to reflect high-energy primary photons to delay their exit from the vessel. Based on these basic understandings, more sophisticated structures were designed and compared in computer simulations. The simulation results indicated that closed-type structures, such as a honeycomb tube, can provide better performance in terms of efficiently generating low-energy electrons in water.