Carbon dating or radiocarbon dating
The Beta-counting method detects the rate at which purified carbon decays. A rate of 7 decays/gram/minute would indicate an age of one half-life, or 5730 years old. 3.5 decays/gram/minute of carbon would be produced by a sample 11,460 years old. A., Kromer, B., Mc Cormac, G., van der Plicht, J., Spurk, M. INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Headquartered in Miami, Florida, Beta Analytic provides biobased content / renewable carbon measurements to top commercial organizations, government agencies, scientists and engineers.The production of radiocarbon has not varied wildly through time, but the changes produce consistent differences from calander ages. This can be overcome by calibration curves calculated by dating materials of precisely known age. Before the industrial revolution, from 1800 - 1400 AD, the natural production of radiocarbon was high, so dates are "too young." From 1400 AD to 300 BC they are "too old," and prior to 300 BC , they are too young.
Once the radiocarbon atom is produced, it rapidly combines with oxygen (OC (7 neutrons) atoms. Carbon-14 is present in all living things in minute amounts.Since it is radioactive, it gradually fades away by radioactive decay until it is all gone.This bomb radiocarbon has been gradually removed from the atmosphere by by natural processes, but the "bomb spike" can be shown through the dating by means such as comparing the bottle date and radiocarbon age of wines. The surplus "bomb" radiocarbon is just one of the effects human have had on the ratio of C.