and the sum of the protons and neutrons gives the atomic mass, the number of neutrons defines the isotope of that element. For example, most carbon (≈ 99 %) has 6 protons and 6 neutrons and is written ...

Researchers at the Accelerator Laboratory of the University of Jyväskylä, Finland, precisely measured atomic masses of ...

That means the radioactive substance decays by 50 percent every six hours until it vanishes, which makes it impossible to stockpile. Half of the entire U.S. supply of that isotope comes from the ...

Stable isotopes have helped uncover migratory routes, trophic levels, and the geographic origin of migratory animals. They can be used on land as well as in the ocean and have revolutionized how ...

Isotope analysis can significantly increase ... because the geology of western central Africa is so diverse that it makes this a perfect landscape to use this method." To develop the new map ...