Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Journal of research of the National Institute of Standards and Technology, 2017, Vol.122, p.1-19, Article 44
Ort / Verlag
National Institute of Standards and Technology
Erscheinungsjahr
2017
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
A new natural uranium solution standard has been produced and will be disseminated
by the National Institute of Standards and Technology (NIST) as Standard Reference
Material 4321d. The standard is certified for the massic activities of 234U, 235U, and
238U in solution, and it is based on isotopic mass data for the metallic Certified
Reference Material (CRM) 112-A (originally issued as SRM 960) that was obtained from THE
U.S. Department of Energy, New Brunswick Laboratory. The metallic CRM was chemically
cleaned, dissolved, and gravimetrically diluted to prepare a master solution, which was
quantitatively dispensed into 5 mL aliquots that were contained within flame-sealed
glass ampoules for each SRM unit. Homogeneity among SRM units, verifying solution
homogeneity, was substantiated by photonic-emission integral counting with a NaI(Tl)
well counter. Confirmatory measurements were performed by liquid scintillation counting
for the total massic activity, and by isotope dilution α spectrometry for the 234U and
238U massic activities.