Radiocarbon dating is essentially a method designed to measure residual radioactivity.
InThomas Higham and co-workers suggested that many of the dates published for Neanderthal artefacts are too recent because of contamination by "young carbon". The ions then travel through a magnetic field, which diverts them into different sampling sensors, known as " Faraday cups ", depending on their mass and level of ionization. As a test, the team took samples of acacia wood from two Egyptian Pharaohs and dated them; the results came back to within what was then a reasonable range: This provides a value for the background radiation, which must be subtracted from the measured activity of the sample being dated to get the activity attributable solely to that sample's 14 C. Concepts Deep time Geological history of Earth Geological time units. Precision for AMS carbon dating results will be better than radiometric dating LSC analysis for samples that are more than 10, years old. Retrieved 11 December