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The accurate determination of minor abundant isotopes is a rather difficult task, hardly achieved by commercial mass spectrometers. When needed, large instruments had to be built in specialised research laboratories. The new Finnigan MAT instrument (262 Q) combines a magnetic sector with a decelerating system and ion counting. The abundance sensitivity achieved is a few parts in 1.0 E-8, an improvement by a factor of 100 over standard commercial spectrometers. Measurements of minor abundant isotopes in natural and depleted uranium are described and compared to multiplier measurements as obtained on a MAT 260. Calibration and operational problems are discussed in detail.

Additional information

Authors: MAYER K, JRC Geel (BE);DE BIEVRE P, JRC Geel (BE);FIEDLER R, International Atomic Energy Agency, Safeguards Analytical Laboratory, Wien (AT)
Bibliographic Reference: Paper presented: Alfred O. Nier Symposium, Los Alamos (US), May 7-10, 1991
Availability: Available from (1) as Paper EN 36014 ORA
Record Number: 199110778 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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