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240 results
  • Measurement of the 231Pa/235U ratio for the age determination of uranium materials. [Journal Article]
    J Radioanal Nucl Chem 2018; 318(3):1565-1571Varga Z, Nicholl A, … Mayer K
  • The paper describes the age (production date) determination of uranium reference materials using the 231Pa/235U ratio. Direct addition of 237Np in secular equilibrium with its 233Pa daughter was chosen instead of the regular milking of 237Np to avoid possible loss of Pa. Sample preparation consists of a fast, one-step procedure. The developed method using ICP-MS for the measurement of 231Pa is mo…
  • Thermal neutron scattering cross sections of 238U and 235U in the γ phase. [Journal Article]
    J Phys Condens Matter 2018; 30(41):415401Saltos AA, Peters NJ, Hammond KD
  • The development of metallic, low-enrichment uranium fuels requires accurate prediction of their neutron transport properties and reactivity parameters, which in turn require thermal neutron scattering data. Accurate prediction of thermal neutron scattering data, including thermal cross sections, requires knowledge of the phonon scattering properties of the medium, but such matrix binding effects …
  • Field Application of 238U/235U Measurements To Detect Reoxidation and Mobilization of U(IV). [Journal Article]
    Environ Sci Technol 2018; 52(6):3422-3430Jemison NE, Shiel AE, … Williams KH
  • Biostimulation to induce reduction of soluble U(VI) to relatively immobile U(IV) is an effective strategy for decreasing aqueous U(VI) concentrations in contaminated groundwater systems. If oxidation of U(IV) occurs following the biostimulation phase, U(VI) concentrations increase, challenging the long-term effectiveness of this technique. However, detecting U(IV) oxidation through dissolved U co…
  • On similarity of various reactor spectra and 235U prompt fission neutron spectrum. [Journal Article]
    Appl Radiat Isot 2018; 135:83-91Košťál M, Matěj Z, … Rypar V
  • A well-defined neutron spectrum is an essential tool not only for calibration and testing of neutron detectors used in dosimetry and spectroscopy but also for validation and verification of evaluated cross sections. A new evaluation of thermal-neutron induced 235U PFNS was performed by the International Atomic Energy Agency (IAEA) in the CIELO (Collaborative International Evaluated Library Organi…
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