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The belief that radiodating methods give absolute measurements of time is widespread as a result of scientific popularization in journals, conferences, and the media.In fact, due to the difficulties in applying the experimental method to events in the past, all chronometers based on natural or artificial nuclear disintegration need a calibration.In this report, for example, we are told that using one radioactive dating technique, a lunar rock sample is 4,283 million years old, plus or minus 23 million years old.

While the lighter isotopes C has decayed that what remains can no longer be measured. In 5,730 years half of the C in the atmosphere, and therefore in plants and animals, has not always been constant.

How do scientists know the bones are really 68 million years old?

Today's knowledge of fossil ages comes primarily from radiometric dating, also known as radioactive dating.

These assumptions are not demonstrated, only supposed to be true.

To give an example of the complexity of this problem, this paper presents a study of the most popular dating method, potassium/argon.