Carbon dating formula math

­ ­As soon as a living organism dies, it stops taking in new carbon.

The ratio of carbon-12 to carbon-14 at the moment of death is the same as every other living thing, but the carbon-14 decays and is not replaced.

(Whatever you're being treated for is the greater danger.) The half-life is just long enough for the doctors to have time to take their pictures.

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A fossil found in an archaeological dig was found to contain 20% of the original amount of 14C. I do not get the $-0.693$ value, but perhaps my answer will help anyway.However, the principle of carbon-14 dating applies to other isotopes as well.Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years. However, I note that there is no beginning or ending amount given.How am I supposed to figure out what the decay constant is?

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