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After another 5,600 years, there is still one quarter left, and after an equally long period of time one eighth, etc.

Carbon-14 is thus said to have a half-life of 5,600 years.

If it is assumed that the intensity of the cosmic radiation has been constant during the last few tens of thousands of years, then the average lifetime of carbon-14 - which is approximately 8,000 years - should be sufficiently long to allow for the formation of a stationary state in the concentration of this isotope not only with reference to the atmosphere, but also to the hydrosphere and biosphere as well.

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Westgren, Chairman of the Nobel Committee for Chemistry of the Royal Swedish Academy of Sciences Your Majesty, Your Royal Highnesses, Ladies and Gentlemen.The Royal Swedish Academy of Sciences this year has decided to award with the Nobel Prize for Chemistry a scientific feat which is less a direct improvement of our material living standards, but more a means of widening and deepening our knowledge in different scientific fields.

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