What is accelerator mass spectrometry?
Accelerator Mass Spectrometry (AMS) is a technique to measure concentration of very rare isotopes of atoms, down one millionth of a ppt. Basically, it is a large mass spectrometer, in which an accelerator is used to brake down all interfering molecules. Magnetic and electric fields are then used to select the wanted are isotope from the beam and measure the amount. Due to the high energies, individual atoms of the rare isotope can be identified and counted with a particle detector.