Accelerator mass spectrometer dating
Cs It is important to have a beam of negative ions entering the accelerator because the negative ions are attacted to the high -voltage terminal which results in their net acceleration. In sequential injection, typical injection repetition rates are 10 sec C analysis.
In the biochemical field, synthesized C labeled compounds can be administered as a tracer dose for in-vivo human metabolic and drug studies which require AMS analysis of graphitized biological samples.AMS is distinct from conventional Mass Spectrometry (MS) because it accelerates ions to extremely high energies (millions of electron volts) compared to the thousands of electron volts in MS (1ke V=1.6×10C present a challenge to conventional MS due to their low natural abundance and high background levels.Researchers were challenged by isobaric interference (interference from equal mass isotopes of different elements exemplified by ) with energies of 2-3 ke V focused on the surface of a solid sample in order to transfer enough energy to the target material to produce free atoms and ions of the sample material.C variations through time, allowing researchers to establish an official radiocarbon calibration curve (also referred to as a radiocarbon clock) dating back 26,000 calendar years.
In the 1960s, nuclear weapons testing released large amounts of neutrons into the atmosphere, nearly doubling C AMS is the radiocarbon dating of the Dead Sea Scrolls to dates from 300 BC to AD 61 by labs in Zurich and Arizona.At this point the beam is about 10 microamps which corresponds to 10 ions per second (mostly the stable isotopes).