Gamma spectrometric measurement of uranium isotopic composition and mass in sintered UO2 pellets using the efficiency transfer method
Journal article, 2023

Gamma spectrometric measurements to determine the isotopic composition and total uranium mass in UO2 pellets (D = 7.5 mm; H = 3.5 mm, ρ = 10 g/cm3) were carried out. The required efficiency curve was obtained by applying the efficiency transfer method from a calibration standard (D = 65 mm; H = 20 mm) of a slightly acidified water solution. The average isotopic composition of ten UO2 pellets was consistent with values of natural uranium given by IUPAC. The average relative bias for the 235U/238U amount ratio was -0.73% using the 1001 keV gamma line for 238U and 0.50% using the 63 keV gamma line (186 keV was always used for 235U). For the total uranium mass, the mean deviation as compared to mass determinations using a balance was 5.5% using the 1001 keV gamma line for 238U and 4.3% using the 63 keV gamma line.


Mass determination

Isotopic composition

Nuclear forensics



Efficiency transfer

Gamma spectrometry


Henrik Ramebäck

Swedish Defence Research Agency (FOI)

Anna Vesterlund

Swedish Defence Research Agency (FOI)

Marcus Hedberg

Chalmers, Chemistry and Chemical Engineering, Energy and Material

S. Jonsson

Swedish Defence Research Agency (FOI)

Petra Lagerkvist

Swedish Defence Research Agency (FOI)

T. Vidmar

Belgian Nuclear Research Center (SCK CEN)

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

09698043 (ISSN) 18729800 (eISSN)

Vol. 192 110607-

Subject Categories

Subatomic Physics

Analytical Chemistry

Water Engineering





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