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Far from being data, these dates are actually interpretations of the data.As discussed before, the assumptions influence the interpretation of the data.
The textbooks speak of the radiometric dating techniques, and the dates themselves, as factual information.
If any of these three conditions is not accurately known, the hourglass will give an inaccurate measure of time.
Radiometric dating is based on the fact that radioactive isotopes decay to form isotopes of different elements.
It is possible to measure the ratio of the different radioactive parent isotopes and their daughter isotopes in a rock, but the ratios are not dates or ages.
The dates must be inferred based on assumptions about the ratios.There are three main assumptions that must be made to accept radiometric dating methods.