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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.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Ming Wang, Jinxing Zheng, Yuntao Song, Xianhu Zeng, Ming Li, Wuquan Zhang, Pengyu Wang, Junsong Shen
Nuclear Technology | Volume 206 | Number 5 | May 2020 | Pages 779-790
Technical Paper | doi.org/10.1080/00295450.2019.1670011
Articles are hosted by Taylor and Francis Online.
The superconducting isochronous cyclotron SC200 for proton therapy is under development in Hefei, and the active scanning method has been selected as the beam delivery technology. To reduce energy loss and transverse scattering of the proton beam, a gas chamber in the pencil beam scanning (PBS) nozzle has been designed to shorten the length of the air segment. To determine whether using a helium filling gas or vacuum is the most suitable for the SC200 PBS nozzle, the beam size and the energy loss at the isocenter and the dose distribution in the water phantom are compared using the TOol for PArticle Simulation (TOPAS) code. The results show that using the helium filling gas resulted in scattering and energy loss of the proton beam compared with using vacuum, but these effects were minimal. Considering the disadvantages of the engineering problems of creating a vacuum chamber, helium was selected as the filling gas for the PBS nozzle chamber. Moreover, the following parameters were analyzed and optimized: gas pressure, gas purity, and film thickness of the chamber. When the helium pressure was below 1.1 atm and the air proportion was less than 5%, the beam size at the lowest energy of the proton beam at the isocenter was lower than 8 mm, meeting the clinical requirements.