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    My weight has fluctuated dramatically throughout my life – I was a fat child, a thin teenager, a chubby sixth former, a skinny student and so on, up and down through my adult life.


    Invented radioactive dating

    The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating.

    These are released as radioactive particles (there are many types).Scientific knowledge of Earth’s geologic history has advanced significantly since the development of radiometric dating, a method of age determination based on the principle that radioactive atoms in geologic materials decay at constant, known rates to daughter atoms.Radiometric dating has provided not only a means of numerically quantifying geologic time but also a tool for determining the...In 1905, shortly after the discovery of radioactivity, the American chemist Bertram Boltwood suggested that lead is one of the disintegration products of uranium, in which case the older a uranium-bearing mineral the greater should be its proportional part of lead.Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase...

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