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Animals eat the plants, and ultimately the radiocarbon is distributed throughout the biosphere.

The ratio of λ is a constant that depends on the particular isotope; for a given isotope it is equal to the reciprocal of the mean-life – i.e.

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The resulting radiocarbon combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire in a sample from a dead plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died.

thus introduced takes a long time to percolate through the entire volume of the ocean.

The deepest parts of the ocean mix very slowly with the surface waters, and the mixing is uneven.

The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.

The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.

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Jonathan Sacerdoti, from the Campaign Against Anti-Semitism, said Channel 5 should "apologise fully for their enormous error of judgement". Nguyen, 33, was one of 13 contestants in the 16th series of Celebrity Big Brother, which started on Thursday.