Production and isolation of homologs of flerovium and element 115 at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry

Despotopulos, John D.; Kmak, Kelly N.; Gharibyan, N.; Brown, Thomas A.; Grant, Patrick M.; Henderson, R. A.; Moody, Κ. J.; Tumey, Scott J.; Shaughnessy, D. A.; Sudowe, Ralf

doi:10.1007/s10967-015-4500-z

Cited by 13 publications

(3 citation statements)

References 16 publications

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“…The 235 U solution (Solution 1) was prepared by dissolving 355 mg of metallic HEU (93.2% 235 U) in 35.5 mL of 3 M HNO 3 . The 237 U in Solutions 2–6 was produced in-house at the Center for Accelerator Mass Spectrometry (CAMS) of Lawrence Livermore National Laboratory , after bombardment of three depleted uranium foils (198–218 mg/cm 2 ) with 15.0 MeV protons ( 238 U(p,x) 237 U). Following irradiation, the 238 U foils were dissolved in hydrochloric and nitric acids, and purified from most of the fission product impurities using a LN resin (Eichrom) based chromatography separation method. , The fourth batch of 237 U for validation (Solutions 7–9) was provided by Idaho National Laboratory (INL) from irradiation of a depleted uranium target with a beam of bremsstrahlung photons at 26 MeV end point energy followed by radiochemical separation of the coproduced fission products .…”

Section: Materials and Methodsmentioning

confidence: 99%

Rapid Quantification of ²³⁷U Specific Activity for Nuclear Forensics

Valdovinos,

Glennon,

Parsons-Davis

et al. 2023

Ind. Eng. Chem. Res.

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In the event of an unattributed nuclear explosion, rapid assessment of the short-lived uranium isotope activity and mass can provide valuable information for subsequent forensic analysis. Rapid analysis in the field is enabled by using microfluidic chemistry and deployable instrumentation. This work presents a flow chemistry system, controlled in LabVIEW, that integrates three functionalities: (1) selective extraction of uranium from the sample matrix via a 3D-printed supported liquid membrane module; (2) UV−visible absorbance spectrophotometry to measure the total uranium concentration in the strip flow; and (3) a portable CdTe γ-ray spectrometer coupled to a 3D-printed flow cell to measure 237 U activity concentration in the strip solution. The system was calibrated using standard solutions, and its functionality was demonstrated using a solution of depleted uranium spiked with 237 U. Uranium concentrations of 40−5000 μg/mL were directly quantified online using a 100 mm optical flow cell, while concentrations of 0.5−10 μg/mL were quantified online using a colorimetric reagent. The mass concentration measurement takes approximately 60 min while the activity concentration via γ-ray spectrometry varies depending on the activity of 237 U, with 1 kBq/mL requiring about 30 min of acquisition time to obtain <10% uncertainty at 1σ. This platform provides a fieldable approach for quantifying uranium mass and radioactivity relevant to postdetonation nuclear debris.

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Section: Materials and Methodsmentioning

confidence: 99%

Rapid Quantification of ²³⁷U Specific Activity for Nuclear Forensics

Valdovinos,

Glennon,

Parsons-Davis

et al. 2023

Ind. Eng. Chem. Res.

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“…The nat In foil (99.9 %, Goodfellow Inc.) was dissolved in 1 M HCl and the 113 Sn was separated by passing the solution through an AG 1 9 8 anion exchange column (removing In) and eluting 113 Sn with 3 M HNO 3 as in Refs. [23,24].…”

Section: Reagents and Materialsmentioning

confidence: 99%

Characterization of the homologs of flerovium with crown ether based extraction chromatography resins: studies in hydrochloric acid

Despotopulos

Kmak

Gharibyan

et al. 2016

J Radioanal Nucl Chem

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A crown-ether-based extraction chromatography resin, Eichrom Pb resin, was characterized for separations of flerovium (Fl) homologs, specifically Pb and Sn. The batch uptake of Pb(II) and Sn(IV) radionuclides was determined from an HCl matrix. Both Pb(II) and Sn(IV) are strongly retained on the resin at different HCl concentrations. The affinity for Pb(II) decreases with increasing HCl concentration while Sn(IV) uptake increases. Extraction kinetics for Pb(II) and Sn(IV) were examined and show suitable uptake on the second time scale. Separation methods for the isolation of individual homologs, Pb(II) and Sn(IV), have been established using 2 mL pre-packed vacuum flow Pb resin columns.

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“…It was established that the K d of both elements in different media on cation- and anion-exchange sorbents was either very low or very high, which did not enable quantitatively separating them from each other [ 18 , 19 , 20 , 21 , 22 , 23 ]. Using commercial extraction chromatographic sorbents TEVA and LN (based on Aliquat 336 and HDEHP, respectively), it was possible to recover carrier-free Hg from macro-amounts of Au; however, 10–20% of Au remained on the column [ 24 , 25 , 26 ]. Sorbents Pb resin, DGA, and TK200 (based on 18-crown-6 derivative, diglycolamide, and trioctylphosphine oxide, accordingly) also made it possible to recover carrier-free Hg, but after this, it was impossible to desorb Au [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Photonuclear Alchemy: Obtaining Medical Isotopes of Gold from Mercury Irradiated on Electron Accelerators

et al. 2022

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In our work, the photonuclear production of 198,199Au isotopes for nuclear medicine purposes was studied, and a method for their recovery from irradiated mercury was developed. The yields of the corresponding nuclear reactions were determined, and a comparison of various methods of obtaining gold radioisotopes was provided. New sorbents based on benzo-15-crown-5, which selectively binds gold, were studied, and the optimal conditions for Au recovery with a high degree of purification from mercury were found. It was established that, for the fast and quantitative recovery of Au isotopes, it was necessary to add at least 0.1 mg of the carrier. As a result, the developed method can be regularly used to obtain 198,199Au for the research of radiopharmaceuticals based on them.

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Production and isolation of homologs of flerovium and element 115 at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry

Cited by 13 publications

References 16 publications

Rapid Quantification of ²³⁷U Specific Activity for Nuclear Forensics

Rapid Quantification of ²³⁷U Specific Activity for Nuclear Forensics

Characterization of the homologs of flerovium with crown ether based extraction chromatography resins: studies in hydrochloric acid

Photonuclear Alchemy: Obtaining Medical Isotopes of Gold from Mercury Irradiated on Electron Accelerators

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Production and isolation of homologs of flerovium and element 115 at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry

Cited by 13 publications

References 16 publications

Rapid Quantification of 237U Specific Activity for Nuclear Forensics

Rapid Quantification of 237U Specific Activity for Nuclear Forensics

Characterization of the homologs of flerovium with crown ether based extraction chromatography resins: studies in hydrochloric acid

Photonuclear Alchemy: Obtaining Medical Isotopes of Gold from Mercury Irradiated on Electron Accelerators

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Rapid Quantification of ²³⁷U Specific Activity for Nuclear Forensics

Rapid Quantification of ²³⁷U Specific Activity for Nuclear Forensics