Radioactive carbon dating video
Tree rings can be counted and their radiocarbon content measured.
As the uranium in rocks decays, it emits subatomic particles and turns into lead at a constant rate.Anything that dies after the 1940s, when Nuclear bombs, nuclear reactors and open-air nuclear tests started changing things, will be harder to date precisely. And that proton that was bumped off just kind of gets emitted. And a proton that's just flying around, you could call that hydrogen 1. If it doesn't gain an electron, it's just a hydrogen ion, a positive ion, either way, or a hydrogen nucleus.For instance, the amount varies according to how many cosmic rays reach Earth.Luckily, we can measure these fluctuations in samples that are dated by other methods.
In addition, samples need to be thoroughly cleaned to remove carbon contamination from glues and soil before dating.