Radioactivity was discovered in 1896 by French physicist Henri Becquerel.
By 1907 study of the decay products of uranium (lead and intermediate radioactive elements that decay to lead) demonstrated to B. Boltwood that the lead/uranium ratio in uranium minerals increased with geologic age and might provide a geological dating tool.
As radioactive Parent atoms decay to stable daughter atoms (as uranium decays to lead) each disintegration results in one more atom of the daughter than was initially present and one less atom of the parent.
It's a whole new flavor of disconcert and disbelief. They've got something wrong - their expectations are off. And right now, when you look at how dating in America and dating in much of the West plays out, you're seeing this wide-eyed, confused disbelief from a large segment of both the male and the female dating populations. You don't hear women over 40 complaining much how there are "no men to date" - even though women at that age have far fewer options than their younger, louder counterparts.
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All rocks and minerals contain long-lived radioactive elements that were incorporated into Earth when the Solar System formed.
These radioactive elements constitute independent clocks that allow geologists to determine the age of the rocks in which they occur.