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After pretreatment, samples for radiocarbon dating are prepared for use in an accelerator mass spectrometer by converting them into a solid graphite form.

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These metal discs are then mounted on a target wheel so they can be analyzed in sequence.There are two accelerator systems commonly used for radiocarbon dating through accelerator mass spectrometry.One is the cyclotron, and the other is a tandem electrostatic accelerator.At this stage, other negatively charged atoms are unstable and cannot reach the detector.

The negatively charged carbon atoms, however, move on to the stripper (a gas or a metal foil) where they lose the electrons and emerge as the triple, positively charged carbon atoms.At this stage, molecules that may be present are eliminated because they cannot exist in this triple charged state.