Carbon dating gcse questions
This means all living things have radioactive carbon-14 in them.
When an organism, eg a tree, dies it stops taking in carbon dioxide.
Irradiated food does not itself become radioactive; however in some cases there may be subtle chemical changes and this may affect the taste.
In the UK only correctly labelled irradiated herbs, spices or vegetable seasonings are allowed.
This substance is carried by the blood to the organ, eg the kidneys or the thyroid gland, that the doctor wants to examine. Tracers are chosen which will concentrate in the part of the body to be investigated, and the tracer's radiation will also be concentrated there.Even though it decays into nitrogen, new carbon-14 is always being formed when cosmic rays hit atoms high in the atmosphere.Plants absorb carbon dioxide from the atmosphere and animals eat plants.Drawing of heads of cave lions in the Chauvet cave (south-east France).Dated by radiocarbon dating of the charcoal used to produce the drawings to around 36,000 years ago. Clottes.] The amount of carbon-14 in the atmosphere has not changed in thousands of years.