This article is from Creation 24 4: The collision threw many tons of debris into the atmosphere and possibly led to the extinction of the dinosaurs and many other life forms. Davis These processes could influence the distribution of lead in magma chambers. The rate of diffusion of helium from a zircon crustal can be measured.
Carbon, though, is continuously created through collisions of neutrons generated by cosmic rays with nitrogen in the upper atmosphere and thus remains at a near-constant level on Earth.
Everything Worth Knowing About ... Scientific Dating Methods
But we do not have an instrument that directly measures age. Based on astronomical models of how stars work, we also believe the Sun to be about 4. I guess that makes at least two geologists for whom radioactive dating was a big factor in their belief in an old earth. Tim says: This argument was used against creationist work done on a piece of wood found in sandstone near Sydney, Australia, that was supposed to be million years old. The Young Earth.