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The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating.Many isotopes have been studied, probing a wide range of time scales.The older the sample, the more carbon 14 will have decayed and the emptier the hourglass will be.
Eventually, the salt water will eat through the steel and release the Plutonium (which, as you know, is quite lethal.) They usually talk about either trying to raise the sub or encase it in concrete where it rests. That's why we are called "Carbon-based life forms." Man, I've really watched too much Star Trek.)Scientists use Carbon-14 to make a guess at how old some things are -- things that used to be alive like people, animals, wood and natural cloths. Anyway, they make an estimate of how much Carbon-14 would have been in the thing when it died...
Our ancestors measured the passing of time with water clocks or hourglasses. It measures time -like our ancestors - by using hourglasses provided by radioactivity.
In the radioactivity hourglass upper part, that gradually empties, are decaying nuclei.
Then, half of that amount in turn decays in the following half-life.
Therefore, the number of radioactive nuclei decreases from A more precise definition of half-life is that each nucleus has a 50 percent chance of surviving for a time equal to one half-life.
Centre des Faibles Radioactivités (Laboratoire mixte CNRS-CEA) Dating with carbon 14 is the best-known technique for measuring the age of archaeological or prehistoric artefacts.