When uranium in surface rocks decays, it naturally turns into radium, which moves into the underground water supply, as happened in New Jersey.
2.
Since Rasmussen found the fossils, however, he and his colleagues have dated the minerals in the rocks, using a technique based on the known rates at which the radioactive elements uranium and thorium in rock decay to the inert element lead.
3.
The helium is in the natural gas because the low levels of radioactive isotopes in the surrounding rocks decay over millions of years, producing helium which cannot escape because of the geology of the rocks ( the helium can't escape for the same reasons the natural gas cannot escape ).
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