Abstract
A spherical energy filter (SEF) was constructed and matched to a MAT-261 mass spectrometer for analyses of very low abundance isotopes. The SEF is a 150-mm mean radius, 90° spherical electrostatic sector, and is located behind the magnet sector using a C configuration. The abundance sensitivity of the modified mas spectrometer, which was measured using a NBS natural uranium sample by both ion counting and current integrating multipliers, was less than 0.13 ppm (unit mass separation at A = 238).
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