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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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.”
H. Ludewig, S. Mughabghab, O. Lazareth, K. Perkins, E. Schmidt, J.R. Powell
Fusion Science and Technology | Volume 20 | Number 4 | December 1991 | Pages 747-752
Space Nuclear Power/Propulsion | doi.org/10.13182/FST91-A11946931
Articles are hosted by Taylor and Francis Online.
A Nuclear Electric Propulsion (NEP) unit capable of propelling a manned vehicle to MARS will be required to have a value of α (kg/kWe) which is less than five. In order to meet this goal the reactor mass, and thus its contribution to the value of α will have to be minimized. In this paper a candidate for such a reactor is described. It consists of a gas cooled Particle Bed Reactor (PBR), with specially chosen materials which allow it to operate at an exit temperature of approximately 2000 K. One of the unique features of a PBR is the direct cooling of particulate fuel by the working fluid. This feature allows for high power densities, highest possible gas exit temperatures, for a given fuel temperature and because of the thin particle bed a low pressure drop. The PBR's described in this paper will have a ceramic moderator (Be2C), ZrC coated fuel particles and a carbon/carbon hot frit. All the reactors will be designed with sufficient fissile loading to operate at full power for seven years. The burn up possible with particulate fuel is approximately 30%-50%. These reactor designs achieve a value of α less than unity in the power range of interest (5 MWe).