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Radiocarbon dating can date samples up to 50,000 years old.Samples older than that contain so little carbon-14 that the dating process is inaccurate.The radioactive isotope carbon-14 is created in the upper atmosphere when cosmic-ray particles from outer space strike nitrogen atoms and transform them into radioactive carbon.Some of the carbon-14 might find its way into living creatures.

Carbon-12 and carbon-13 are both stable isotopes, but carbon-14 is unstable and is radioactive.Most commercial analysers use californium-252 neutron sources together with sodium iodide detectors and are mainly sensitive to TNC reactions.Other use Am-Be-241 sources and bismuth germanate detectors, which register both TNC and NIS.Living things contain carbon-14 and carbon-12 in a ratio that is the same as in the atmosphere at the time.When the organism dies, the ratio of carbon-14 to carbon-12 decreases, as carbon-14 decays and is no longer incorporated into the organism.We know these steps because researchers followed the progress of the radioactive carbon-14 throughout the process.Radioactive isotopes are useful for establishing the ages of various objects.An example of the ingenious technical work and hard-fought debates underlying the main story is the use of radioactive carbon-14 to assign dates to the distant past.For other examples, see the essays on Temperatures from Fossil Shells and Arakawa's Computation Device.After a creature's death the isotope would slowly decay away over millennia at a fixed rate.Thus the less of it that remained in an object, in proportion to normal carbon, the older the object was.The two main techniques are Thermal Neutron Capture (TNC) and Neutron Inelastic Scattering (NIS).TNC occurs immediately after a low-energy neutron is absorbed by a nucleus, NIS takes place instantly when a fast neutron collides with a nucleus.Nuclear techniques are increasingly used in science, industry and environmental management.The continuous analysis and rapid response of nuclear techniques, many involving radioisotopes, mean that reliable flow and analytic data can be constantly available.

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