On the accuracy of gamma spectrometric isotope ratio measurements of uranium
Artikel i vetenskaplig tidskrift, 2016

The isotopic composition of uranium was measured using high resolution gamma spectrometry. Two acid solutions and two samples in the form of UO2 pellets were measured. The measurements were done in close geometries, i.e. directly on the endcap of the high purity germanium detector (HPGe). Applying no corrections for count losses due to true coincidence summing (TCS) resulted in up to about 40% deviation in the abundance of U-235 from the results obtained with mass spectrometry. However, after correction for TCS, excellent agreement was achieved between the results obtained using two different measurement methods, or a certified value. Moreover, after corrections, the fitted relative response curves correlated excellently with simulated responses, for the different geometries, of the HPGe detector.

4th Collaborative Material Exercise (CMX-4)

True coincidence summing

Group (ITWG)

Isotope ratio

Nuclear Forensics International Working


Gamma spectrometry


Henrik Ramebäck

Chalmers, Kemi och kemiteknik, Energi och material

Petra Lagerkvist

Totalförsvarets forskningsinstitut (FOI)

S. Holmgren

Totalförsvarets forskningsinstitut (FOI)

S. Jonsson

Totalförsvarets forskningsinstitut (FOI)

B. Sandstrom

Totalförsvarets forskningsinstitut (FOI)

A. Tovedal

Totalförsvarets forskningsinstitut (FOI)

Anna Vesterlund

Chalmers, Kemi och kemiteknik, Energi och material

T. Vidmar

Belgian Nuclear Research Center (SCK CEN)

J. Kastlander

Totalförsvarets forskningsinstitut (FOI)

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

0168-9002 (ISSN)

Vol. 815 57-61



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