14c carbon dating
If wisdom comes with age, then brain cells are some of the wisest in the body: researchers have applied carbon dating to DNA to confirm that cells in the brain live longer than most others.
This is a new application for the technique, which is traditionally used in archaeology and palaeoanthropology to pinpoint the age of fossils.
Radiocarbon dating (usually referred to simply as carbon-14 dating) is a radiometric dating method.
It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old.
Soil cores were also taken from a blanket bog on Hard Hill (560 m) at Moor House National Nature Reserve in 1998.
All cores were sliced in the field into five layers, each of 2 cm, to a total depth of 10 cm.
Known as radiocarbon dating, this method provides objective age estimates for carbon-based objects that originated from living organisms.
But Jonas Frisén of the Karolinska Institute in Stockholm, Sweden, says it can be done if one takes advantage of the signal left by nuclear testing, which spewed high levels of carbon-14 into the air during the Cold War.
Korff predicted that the reaction between these neutrons and nitrogen-14, which predominates in the atmosphere, would produce carbon-14, also called radiocarbon.
Libby cleverly realized that carbon-14 in the atmosphere would find its way into living matter, which would thus be tagged with the radioactive isotope.
These include the starting conditions, the constancy of the rate of decay, and that no material has left or entered the sample.
Furthermore, if a sample has been contaminated, scientists will know about it.Beyond that timespan, the amount of the original C formed by irradiation of nitrogen by neutrons from the spontaneous fission of uranium, present in trace quantities almost everywhere.