Nuclides in carbon 14 dating
Radon and its isotopes, parent radionuclides, and decay products all contribute to an average inhaled dose of 1.26 m Sv/a.Radon is unevenly distributed and variable with weather, such that much higher doses occur in certain areas of the world.This is because humans evolved too recently for the difference in activity over a fraction of a half-life to be significant.Put another way, human history is so short in comparison to a half-life of a billion years that the activity of these long-lived isotopes has been effectively constant throughout our time on this planet.This is four times more than the worldwide average artificial radiation exposure, which in the year 2008 amounted to about 0.6 m Sv per year.
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The biggest source of natural background radiation is airborne radon, a radioactive gas that emanates from the ground.Radon is a decay product of uranium, which is relatively common in the Earth’s crust but more concentrated in ore-bearing rocks scattered around the world.
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