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.

Isotope ratio

Group (ITWG)

Nuclear Forensics International Working


True coincidence summing

4th Collaborative Material Exercise (CMX-4)

Gamma spectrometry


Henrik Ramebäck

Kemi och kemiteknik, Energi och material, Kärnkemi

Petra Lagerkvist

Totalforsvarets forskningsinstitut

S. Holmgren

Totalforsvarets forskningsinstitut

S. Jonsson

Totalforsvarets forskningsinstitut

B. Sandstrom

Totalforsvarets forskningsinstitut

A. Tovedal

Totalforsvarets forskningsinstitut

Anna Vesterlund

Kemi och kemiteknik, Energi och material, Kärnkemi

T. Vidmar

Belgian Nuclear Research Center

J. Kastlander

Totalforsvarets forskningsinstitut

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

0168-9002 (ISSN)

Vol. 815 57-61