Cannot be used dating Carbon-14

Gentry has researched radiohalos for many years, and published his results in leading scientific journals. Replies 27 Views 2K. The strength of the Earth's magnetic field affects the amount of cosmic rays entering the atmosphere. Some of the intermediate decay products—such as the polonium isotopes—have very short half-lives they decay quickly. A specimen older than 50, years should have too little 14 C to measure. Thorium has a long half-life decays very slowly and is not easily moved out of the rock, so if the lead came from thorium decay, some thorium should still be there. Is carbon harmful to humans?

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