Describe one application of radiocarbon dating
The calibrated date is our “best estimate” of the sample’s actual age, but we need to be able to return to old dates and recalibrate them because new research is continually used to update the calibration curve.
The second difficulty arises from the extremely low abundance of C, making it incredibly difficult to measure and extremely sensitive to contamination.
Radiocarbon dating works by comparing the three different isotopes of carbon.
Isotopes of a particular element have the same number of protons in their nucleus, but different numbers of neutrons.
While the lighter isotopes C has decayed that what remains can no longer be measured. In 5,730 years half of the C in the atmosphere, and therefore in plants and animals, has not always been constant.
In 2008 we could only calibrate radiocarbon dates until 26,000 years.This means that although they are very similar chemically, they have different masses.The total mass of the isotope is indicated by the numerical superscript.In the early years of radiocarbon dating a product’s decay was measured, but this required huge samples (e.g. Many labs now use an Accelerator Mass Spectrometer (AMS), a machine that can detect and measure the presence of different isotopes, to count the individual C atoms in a sample.This method requires less than 1g of bone, but few countries can afford more than one or two AMSs, which cost more than A0,000.