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The ions produced are forced into a magnetic field where the different mass of the carbon isotopes causes a different deflection, allowing the quantity of each isotope to be measured.
This method is claimed to be more accurate than the older and slower method of counting the number of radioactive decay emissions from a quite large sample.
...[Some authors have said] they were "not aware of a single significant disagreement" on any sample that had been dated at different labs.
Such enthusiasts continue to claim, incredible though it may seem, that "no gross discrepancies are apparent".
This limit is currently accepted by nearly all radiocarbon dating practitioners.