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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.Smoke alarms contain a weak source made of Americium-241.Alpha particles are emitted from here, which ionise the air, so that the air conducts electricity and a small current flows.

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The Slides are to be shown at the front and then each item is shown in turn and the pupils use their graphs to calculate the age of each item from the percentage of carbon found in them. take longer than you think, but keeps them engaged and there're questions to be answered in their books also.Free 5-day trial Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. As we age, our hair turns gray, our skin wrinkles and our gait slows.Carbon-14 reacts identically to Carbon-12 and is rapidly oxidised to form (Carbon-14)Dioxide.

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 age of a rock can be calculated if its ratio of uranium to lead is known.

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