Christian dating after 50
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Overall, the energy of the Earth's magnetic field has been decreasing, so more C is being produced now than in the past.
There are various other radiometric dating methods used today to give ages of millions or billions of years for rocks.
These techniques, unlike carbon dating, mostly use the relative concentrations of parent and daughter products in radioactive decay chains.
The rate of decay of N in 5,730 years (plus or minus 40 years).
This is the “half-life.” So, in two half-lives, or 11,460 years, only one-quarter of that in living organisms at present, then it has a theoretical age of 11,460 years.