Uranium 235 decay to lead has a half-life of 713 million years, so it is well suited to dating the universe.
other isotope pairs cover intermediate time periods between the spans for carbon 14 and uranium.
We thank you in advance for partnering with us in this small but significant way. All methods of radioactive dating rely on three assumptions that may not necessarily be true: It is assumed that the rate of decay has remained constant over time.
This assumption is backed by numerous scientific studies and is relatively sound.
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After a long enough time the minority isotope is in an amount too small to be measured.