Certification of a uranium-238 dioxide reference material for neutron dosimetry (EC nuclear reference material 501)
Uranium-238 oxide of 99.999% isotopic and 99.98% chemical purity was transformed into dioxide spheres of nominal 0.5 and 1.0mm diameter by gel precipitation and subsequent calcination under carbon dioxide and under argon containing 5% hydrogen at 1,125 K. The spheres were analysed by thermal ionisation mass spectrometry, including isotope dilution, by gravimetry and by potentiometric titration. On the basis of these analyses, the uranium mass fraction was certified at 879.4 +- 2.8 g/kg, and the 235U/U(-) and 238U/U abundances at 10.4 +- 0.5 mg/kg and 999.9896 +- 0.0005 g/kg, respectively. The material is intended to be used as a reference material in neutron metrology.
Bibliographic Reference: EUR 12438 EN (1989) 24 pp., FS, ECU 5
Record Number: 199010044 / Last updated on: 1994-12-01
Original language: en
Available languages: en