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A special high-accuracy combined neutron-gamma detector for the determination of plutonium element concentration in powder and pellet samples of plutonium oxide and mixed oxide was thoroughly tested during a measurement exercise at ITU, Karlsruhe in July 1992. Specially prepared samples of well-characterised plutonium oxide were filled into bottles of the type likely to be met in safeguards practice and measured in the new detector. The results were used to establish a calibration curve and to check the potential accuracy of this measurement device. Measurement results were evaluated using the Los Alamos neutron coincidence software (NCC) and the Lawrence Livermore gamma spectra deconvolution code MGA. The results of the measurement exercise are presented and it is demonstrated that accuracies of the order of 0.1 - 0.2 % should be achievable for the non-destructive determination of Pu element concentration in gram-sized samples.

Additional information

Authors: MENLOVE H, Los Alamos National Laboratory (US);WELLUM R, JRC Karlsruhe (DE);OUGIER M, JRC Karlsruhe (DE);WAGNER H G, Euratom Safeguards Directorate, Luxembourg (LU): JRC Geel (BE);GOERTEN J, Euratom Safeguards Directorate, Luxembourg (LU): JRC Geel (BE);MAYER K,
Bibliographic Reference: Paper presented: 15th Annual Symposium of the European Safeguards Research and Development Association (ESARDA), Roma (IT), May 11-13, 1993
Availability: Available from (1) as Paper EN 37425 ORA
Record Number: 199310949 / Last updated on: 1994-11-29
Original language: en
Available languages: en