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High count rates of lithium ions in an AMS measurement system for 14 C were traced to the lithium content in the quartz tubes used in the graphitization of the samples. The lithium contamination was nearly eliminated by the use of borosilicate glass reaction tubes at a lower reaction temperature. The ion beam current and the measurement precision of the isotope ratio were not affected.
Loyd et al. (Tue,) studied this question.