Arthur Holmes

Arthur Holmes and the Age of the Earth

Arthur Holmes and the Age of the Earth

On January 14, 1890, British geologist Arthur Holmes was born. Holmes pioneered the use of radiometric dating of minerals and was the first earth scientist to grasp the mechanical and thermal implications of mantle convection, which led eventually to the acceptance of plate tectonics. “There are few problems more fascinating than those that are bound up with the bold question: How old is the Earth? With insatiable curiosity men have been trying…
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Alfred Nier – a Pioneer in Mass Spectroscopy

Alfred Nier – a Pioneer in Mass Spectroscopy

On May 28, 1911, American physicist Alfred Otto Carl Nier was born. Nier pioneered the development of mass spectrometry. He was the first to use mass spectrometry to isolate uranium-235 which was used to demonstrate that 235U could undergo fission and developed the sector mass spectrometer configuration now known as Nier-Johnson geometry. “…You try to untangle all of these processes to get at the primordial ratio of the heliums in the cosmic…
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