Abstract
We describe the performance of a multiple-collector thermal ionization mass spectrometer (Finnigan MAT 262) which has been modified by replacing the adjustable Faraday collectors with ion-counting channeltrons. This configuration allows isotope abundance measurements with very small ion beams down to 10 −18 A, even if the signal is not very stable. Problems specific to the use of channeltrons and their intercalibration are discussed. Results from test measurements indicate that — apart from limitations from statistics — a precision better than 1% can be achieved for isotope ratio measurements. Such an instrument will be useful for isotope measurements, including isotope dilution measurements, where sample size is a problem. One application is the measurement of the isotopic composition of trace elements in interstellar grains in meteorites.
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