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Posted by / 15-Apr-2020 02:44

Application of carbon dating

Certainly if there was such a Flood, as we maintain from several other lines of evidence and reasoning, most living things would have perished, and so we would expect a ‘cut-off’ point at this time.

In other words, going into the past, we should reach a period of time in which there is a sharp reduction in the number of specimens compared to the period just older than that, and as we went forward in time, we would expect a gradual buildup, as plant and animal populations recovered their numbers. Using the 15,000 published dates previously mentioned after adjusting them as described, he grouped them into 500 year ‘blocks’ and found a dramatic drop-off about 5,000 years ago, with a worldwide distribution (, Ed.

It is assumed that the ratio has been constant for a very long time before the industrial revolution. (For on it hangs the whole validity of the system.) Why did W. Libby, the brilliant discoverer of this system, assume this?

Libby knew that C was entering and leaving the atmosphere (and hence the carbon cycle).

C-14 is another radioactive isotope that decays to C-12. Because of its short half-life, the number of C-14 isotopes in a sample is negligible after about 50,000 years, making it impossible to use for dating older samples.

The half-life of C-14, however, is only 5,730 years.

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.

In fact, the whole method is a giant ‘clock’ which seems to put a very young upper limit on the age of the atmosphere.

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).

What methods do they use and how do these methods work?

In this article, we will examine the methods by which scientists use radioactivity to determine the age of objects, most notably carbon-14 dating.

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As soon as it dies, however, the C ratio gets smaller.

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