Radiocarbon dating method ppt
Besides providing evidence for an Earth age of less than 30,000 years, this fact invalidates the carbon dating as a dating method.
There are various factors that affect the carbon ratio: The Earth’s Magnetic Field The earth’s magnetic field reflects cosmic rays back into space, reducing the rate of carbon 14 production.
Since the earth is theorized to have had life on it for 3.8 billion years, equilibrium must have been reached.
Therefore, scientists assume the carbon ratio at death in a dated organism would be the same in the past as it is today.
After archaeologists have thoroughly surveyed the site they begin excavation. Then archaeologists excavate the site using trowels, shovels, and various other tools.
They start by setting up a grid and connecting the grid to a datum. They carefully remove dirt and note the precise location of any artifacts found.
Archaeologists also look for features while excavating a site.
This uses the decay of carbon and the ratio of C-12 to C-14 to determine the age of the artifact. It is also not very accurate for more recent artifacts.
Using all of the information about the artifacts, including context, typology, dating and more, archaeologists can piece together the events and culture of past society.
Artifacts can also be dated using dendrochronology, which uses the annual growth rings in trees to establish an age for artifacts.
Artifacts can also be dated using radiocarbon dating.This amount of carbon was on the surface of the earth in the past.