Other corrections must be made to account for the proportion of 14 C in different types of organisms fractionation , and the varying levels of 14 C throughout the biosphere reservoir effects. Animals eat the plants, and ultimately the radiocarbon is distributed throughout the biosphere. The other common technology used for measuring 14 C activity is liquid scintillation counting, which was invented in , but which had to wait until the early s, when efficient methods of benzene synthesis were developed, to become competitive with gas counting; after liquid counters became the more common technology choice for newly constructed dating laboratories.
Establishing dates Moving away from techniques, the most exciting thing about radiocarbon is what it reveals about our past and the world we live in. Since certain species of animals existed on Earth at specific times in history, the fossils or remains of such animals embedded within those successive layers of rock also help scientists determine the age of the layers. You can make it easier for us to review and, hopefully, publish your contribution by keeping a few points in mind. Retrieved 1 January Upwelling mixes this "old" water with the surface water, giving the surface water an apparent age of about several hundred years after correcting for fractionation. Most 14 C is produced in the upper atmosphere where neutrons, which are produced by cosmic rays , react with 14 N atoms. Libby and James Arnold proceeded to test the radiocarbon dating theory by analyzing samples with known ages.