Ireland, T.R.; Schram, N.; Holden, P.; Lanc, P.; Ávila, J.; Armstrong, R.; Amelin, Y.; Latimore, A.; Corrigan, D.; Clement, S.; Foster, J.J.; Compston, W.
Measurement of ion currents is fundamental to isotope ratio measurements. For small signals, discrete
ion arrivals can be detected in pulse counting systems. This procedure works well until a few hundred
thousand counts per second when dead time and gain drift become significant. Where sufficiently
high signal is available, ion currents can be measured directly in Faraday cups coupled to electrometers
with high ohmic (1011, 1012 ) resistors. However, electrometers measuring current are...[Show more]
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