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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 757 records · Page 42
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

System and method for collecting and isolating radiosotopes

A method for obtaining 225 AC from 225 Ra having the steps of assembling a column having an inorganic stationary phase; priming the column to immobilize 226 Ra 225 Ra and natural decay products therefrom; immobilizing the 226 Ra, 225 Ra, 224 Ra, and natural decay products therefrom onto a stationary phase within the column; and eluting the column containing the 225 Ra with an aqueous sulfate solution to obtain a milking effluent that contains 225 AC. Also provided is a method for obtaining pure 225 AC from its isotope parents, the method comprising assembling a column having a stationary phase comprising an inorganic material; priming the column with the isotope parents to immobilize 225 Ac, and natural decay products of 225 AC; immobilizing the 225 Ac, and natural decay products therefrom onto the stationary phase within the column 226 Ra, 225 Ra, 224 Ra; and eluting the column containing the 225 AC to obtain an effluent that contains the isotope parents.

Brown, Michael A.↗
DOE OSTI2023

Systems, method and computer-accessible medium for providing balanced asymmetric interferometry for vibrationally isolated optical scanning probe(s)

An exemplary apparatus can provide radiation to a sample(s), which can include, for example, a radiation source arrangement configured to provide radiation, a beam splitter configured to split the radiation into (i) a first radiation, and (ii) a second radiation. An optical element can also be provided which, in operation, can, e.g., (a) receive the first radiation and the second radiation, (b) reflect the first radiation as a reference radiation, (c) provide the second radiation as illumination for the sample(s), (d) receive a resultant radiation from the sample(s) that can be based on the illumination from the second radiation, and (e) provide the reference radiation and the resultant radiation to be detected and used for interferometric imaging or spectroscopy.

McLeod, Alexander Swinton↗
DOE OSTI2020

Brine Availability Test in Salt, a Heated Borehole Experiment at the Waste Isolation Pilot Plant, New Mexico, USA - 20233

The Brine Availability Tests in Salt is a US Department of Energy Office of Nuclear Energy supported activity as part of the Spent Fuel and Waste Disposition Campaign where we are performing simultaneous heated and control experiments in adjacent horizontal boreholes in the WIPP Salt Disposal Investigation drifts as part of experimental Phase 1. Phase 1a of BATS, a low-cost, small spatial-scale experiment performed in order to design instrumentation and methods for further experimentation in the URL, has been completed (June 2018 - May 2019) and is described elsewhere. In coincidence with multiple physical parameters that will be measured over the duration of the experiment, we will be measuring the liquid and vapor phases of H{sub 2}O as well as its isotopic content (not measured in Phase 1a). Three different forms of water occur in natural salts: as fluid in macro scale (mm size) inclusions, as intergranular free H{sub 2}O and as H{sub 2}O incorporated in hydrous minerals. Each of these forms has potentially different stable isotope signatures and will be influenced differentially by heat induced transport and by interaction with introduced tracers. Continuous measurement of vapor phase H{sub 2}O isotopes during borehole heating will be impacted by several effects: 1) evaporation as liquid brine flows into the borehole and evaporates completely or partially into the dry N{sub 2} stream; 2) steam from dehydration of hydrous minerals, that may enter the borehole; and 3) hydrous minerals that may form in the borehole (preferentially incorporating heavier isotopes). The continuous time series collected over the course of the heating test will be combined with analyses of pre-test and post-test collected samples of test site salt to investigate the contributions of each of the three water types as H{sub 2}O is mobilized due to the effects of heating. (authors)

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2020

Panel Session 25: DOE Waste Isolation Pilot Plant (WIPP) Update 2020

This panel focused on the WIPP operational efficiencies and capital improvement progress in the year 2020. Because WIPP is a key component of the US DOE EM cleanup strategy, the progress on returning WIPP to full design capacity and throughput by 2021 is of importance. Panelists with presentations: Status of WIPP Capital Asset Projects (Stephen Smith); WIPP Update (Sean Dunagan); CBFO Update (Greg Sosson)

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
DOE OSTI2024

Ring resonator with integrated detector for monitoring light comprising an annular detection region that is physically isolated from a waveguide core

Examples described herein relate to a ring resonator. The ring resonator may include an annular waveguide having a waveguide base and a waveguide core narrower than the waveguide base. Further, the ring resonator may include an outer contact region comprising a first-type doping and disposed annularly and at least partially surrounding an outer annular surface of the waveguide base. Furthermore, the ring resonator may include an inner contact region comprising a second-type doping and disposed annularly contacting an inner annular surface of the waveguide base. Moreover, the ring resonator may include an annular detector region disposed annularly at a distance from and covering at least a portion of a surface of the waveguide core and contacting the outer contact region.

Yuan, Yuan↗