Carbon dating chart

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Obviously this only works for things which once contained carbon—it can’t be used to date rocks and minerals, for example. We obviously need to know this to be able to work out at what point the ‘clock’ began to tick.

We’ve seen that it would have been the same as in the atmosphere at the time the specimen died. Do scientists assume that it was the same as it is now? It is well known that the industrial revolution, with its burning of huge masses of coal, etc.

Because Libby believed that the Earth was millions of years old, he assumed that there had been plenty of time for the system to be in C was entering the atmosphere as fast as it was leaving—calculations show that this should take place in about 30,000 years, and of course the Earth was much older than that, said the geologists.

Imagine a tank with water flowing in at a certain rate, and flowing out again at the same rate (see diagram below). If you saw it for the first time, you wouldn’t be able to work out how old it was—how long it had been since it was ‘switched on’. Imagine the same tank, this time it is not yet full and the top tap is flowing more quickly than the bottom one is leaking out—this gives you a way of measuring how long ago the whole system was ‘switched on’ and it also tells you that that can’t have been too long ago (see diagram above).

In other words, the further you go back, the more you have to shrink the radiocarbon dates to make them fit the facts.

It will therefore have the same proportion of 14 C as the atmosphere, or in the case of marine animals or plants, with the ocean. Whereas she will be sharing you with your children and ex wife, you will not be sharing her.

There were bigger problems on his hand than the colour of Greengrass eyes, however intriguing they were.

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