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A Brief Review of Diffusion When radioactive isotopes decay in rock, various gases are produced as a byproduct.
For example, uranium-238 in the rock decays to lead by alpha decay, producing alpha particles that combine with electrons to form helium.
This team, supported by several creationist organizations, exists to disprove the validity of radiometric dating.
But there is a significant amount of helium still inside the zircons, showing their ages to be 6,000 /- 2,000 years.
That observation is clearly at odds with the belief that world is only around 6000 years old.
To counter the conclusions of radiometric dating creationists have formed the RATE (Radioisotopes and the Age of the Earth) Group.
The argument, presented in a creationist journal goes like this: The rock formation is radiometrically dated at about 1.5 billion years of age.
The zircons contain uranium and thorium which have decayed to their daughter products including helium.