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    Cosmic radiation dating

    Dedicated at the University of Chicago on October 10, 2016.In 1946, Willard Libby proposed an innovative method for dating organic materials by measuring their content of carbon-14, a newly discovered radioactive isotope of carbon.As a result, there is a changing ratio of carbon-14 to the more atomically stable carbon-12 involves actually counting individual carbon-14 atoms.

    The following was developed by the National Council on Radiation Protection and Measurement (NCRP 93) and is a breakdown of the sources of radiation for the population of the United States.Everything in our world contains small amounts of radioactive atoms like Potassium 40, Radium 226 and Radon 222.These are either left over from the creation of the world (like Uranium and Radium) or made by interactions with cosmic radiation (like Carbon 14 and Tritium).Long-term changes in the geomagnetic field and the galactic cosmic ray intensity could affect the dose rate.The effects are shown to be small over the past 500 ka in most circumstances.

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