Technical Note: Noble gas extraction procedure and performance of the Cologne Helix MC Plus multi-collector noble gas mass spectrometer for cosmogenic neon isotope analysis
2021
Abstract. We established a new laboratory for noble gas mass spectrometry that is
dedicated to the development and application to cosmogenic nuclides at the
University of Cologne (Germany). At the core of the laboratory are a
state-of-the-art high-mass-resolution multicollector Helix MC Plus
(Thermo Fisher Scientific) noble gas mass spectrometer and a novel custom-designed
automated extraction line. The mass spectrometer is equipped with five
combined Faraday multiplier collectors, with 10 12 and
10 13 Ω pre-amplifiers for faraday collectors. We describe the
extraction line and the automated procedure for cosmogenic neon and the
current performance of the experimental set-up. Performance tests were
conducted using gas of atmospheric isotopic composition (our primary
standard gas), as well as CREU-1 intercomparison material, containing a
mixture of neon of atmospheric and cosmogenic composition. We use the
results from repeated analysis of CREU-1 to assess the performance of the
current experimental set-up at Cologne. The precision in determining the
abundance of cosmogenic 21 Ne is equal to or better than those reported
for other laboratories. The absolute value we obtain for the concentration
of cosmogenic 21 Ne in CREU is indistinguishable from the published
value.
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