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Radioactive dating gcse questions

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Materials that originally came from living things, such as wood and natural fibres, can be dated by measuring the amount of carbon-14 they contain.

For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.

With paper, or plastic, or aluminium foil, b rays are used, because a will not go through the paper.

We choose a source with a long half-life so that it does not need to be replaced often.

Once an organism dies, it stops taking in carbon-14.

The carbon-14 it contained at the time of death decays over a long period of time, and the radioactivity of the material decreases.

Easily modified for different abilities, with my low ability I made all the percentages either 75%, 50% or 25% to make it much easier for them. The worksheets can be used in a number of ways, I used them in two ways, I laminated them both in the same pouch front to back for them to use as a mini whiteboard and write directly on them with a whiteboard pen then rub out the ink for reuse for different questions and classes and to use as group work.

Since all living organisms on Earth are made up of organic molecules that contain Carbon atoms derived from the atmosphere, they therefore contain Carbon-14 atoms.The unstable Carbon-14 within the organism begins to decay to form Nitrogen-14 by emitting a beta particle.Over time there is a gradual decrease in the amount of Carbon-14 and the ratio of Carbon-14 atoms to other Carbon atoms declines. Therefore half of the Carbon-14 has decayed after 5730 years.Half of the remaining Carbon-14 then decays over the next 5730 years leaving one fourth of the original amount.By measuring the ratio of Carbon-14 in a sample and comparing it to the amount in a recently deceased sample its date can be determined.Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.