Powerpoint presentation on carbon dating
ANZQA 90256 2006Radio-Carbon Dating Cobalt 60 is a beta emitter used in medicine. Whichever the new mass of the nucleus is still very close to the mass of the old nucleus 60Co and since only half of the 60Co atoms have decayed the total mass of the radioactive 60Co will not be significantly different to the old 60Co mass.It is created in a nuclear reactor, and decays with a half-life of 5.2 years. In 2001, the contents of a sealed lead container were 2.0 g of radioactive Cobalt 60.2) Determine the approximate mass of the contents five years later. C-12 is by far the most common isotope, while only about one in a trillion carbon atoms is C-14.C-14 is produced in the upper atmosphere when nitrogen-14 (N-14) is altered through the effects of cosmic radiation bombardment (a proton is displaced by a neutron effectively changing the nitrogen atom into a carbon isotope). By: Kelly Davenport, John Kolenda, Rosalie Tolentino, David Mc Cracken. Carbon Dating: a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon 14; believed to be reliable up to 40,000 years An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Libby estimated that the steady state radioactivity concentration of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram.
That can be extended to perhaps 100,000 years by accelerator techniques for counting the carbon-14 concentration .
MORE INFORMATION This is how carbon dating works: Carbon is a naturally abundant element found in the atmosphere, in the earth, in the oceans, and in every living creature.
The new isotope is called "radiocarbon" because it is radioactive, though it is not dangerous.
It is naturally unstable and so it will spontaneously decay back into N-14 after a period of time.
Presuming the rate of production of carbon-14 to be constant, the activity of a sample can be directly compared to the equilibrium activity of living matter and the age calculated.