What is a radionuclide decay curve? It is also the time it takes for the count-rate of a substance to reduce to half of the original value. Alpha radiation can't travel through the skin remember! This can be used to find out how old things are. Radiocarbon or Carbon dating is a technique used by scientist to date bones, wood, paper and cloth.
The carbon - 14 which is formed is radioactive and decays to produce nitrogen again.
The amount of carbon in the atmosphere has not changed in thousands of years. Here are the main uses you will be expected to know about:. Photographic radiation detectors - these make use of the fact that radiation can change the colour of photographic film. Copying of website material is NOT permitted. The age of archaeological specimens can be calculated by looking at the amount of carbon - 14 in a sample. Nuclear Fission Reactions, nuclear power as an energy resource gcse physics revision notes.