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Strontium: Supply-and-demand success for the DOE’s Isotope Program
The Department of Energy’s Isotope Program (DOE IP) announced last week that it would end its “active standby” capability for strontium-82 production about two decades after beginning production of the isotope for cardiac diagnostic imaging. The DOE IP is celebrating commercialization of the Sr-82 supply chain as “a success story for both industry and the DOE IP.” Now that the Sr-82 market is commercially viable, the DOE IP and its National Isotope Development Center can “reassign those dedicated radioisotope production capacities to other mission needs”—including Sr-89.
S.N. Korshunov, V.I. Vasiliev, M.I. Guseva, V.M. Gureev, L.S. Danelyan, V.V. Zatekin, V.S. Kulikauskas
Fusion Science and Technology | Volume 38 | Number 3 | November 2000 | Pages 357-362
Technical Paper | Special Issue on Beryllium Technology for Fusion | doi.org/10.13182/FST00-A36150
Articles are hosted by Taylor and Francis Online.
The mixed W-Be layers were prepared by deposition of Be and W atoms on a Be substrate under simultaneous sputtering of Be and W targets by 20 keV Ar+-ions. The thickness of the deposited mixed W-Be layer was ∼500 nm. The element composition analysis of these layers showed that the mixed layer contains up to 35 at.% W, up to 35 at.% Be and up to 30 at.% O. The W-Be films on Be were irradiated by pulsed deuterium plasma flux in the electrodynamic plasma MKT-accelerator with a deuterium plasma concentration of 1021 m−3, maximal ion energy of (1–2) keV and with the energy flux density of 0.2 MJ/m2 per pulse. The pulse duration was equal to 60 μs. After irradiation by two plasma pulses the W-Be film is melted and removed completely from the local surface areas. The element distributions in a mixed layer after an effect of the pulsed plasma are essentially changed. For the surface areas with the removed film the Be concentration is about 75 at.%, W — about 15 at.%, O - about 10 at.% and the penetration of W and O atoms is up to 1000 nm deep of Be substrate. For the surface areas with the retained melted film the Be surface concentration increase up to 90 at.%, tungsten and oxygen concentration decrease about 2–3 times. The method of Elastic Recoil Detection Analysis was used to study D retention. The integral deuterium concentrations are equal to 0.6·1020 and 2.2·1020 m−2 for the removed film areas and for the retained melted film ones, correspondingly. Consequently, deposited W-Be film promotes the essential reduction of D retention in Be substrate. Transmission electron microscopy was used to study the erosion product size distribution. The erosion products were collected on basalt filter fibers located in a shadow of the pulsed plasma flux around the exposed WBe film target. The erosion product size distribution has two maxima located in the ranges 0.1–0.2 μm and 2.5–5.0 μm.