giving off radiation and changing into a different isotope. The rate at which nuclei decay is constant. Half-life describes the interval of time during which half of the original atoms decay.

They do this at a constant rate called an isotope's "half-life". Most carbon comes in the stable forms of carbon-12 (six protons, six neutrons) or carbon-13, but a very small amount (about 0. ...

Stable isotopes are non-radioactive forms of atoms. Although they do not emit radiation, their unique properties enable them to be used in a broad variety of applications, including water and soil ...

0.0625 of the original sample This could then be incorporated into other data. So, if the half-life is two days, four half-lives is 8 days. If a sample has a count rate of 3,200 Bq at the start ...

This is done by choosing isotopes that: The half-life should be long enough to produce useful measurements but short enough for the radioactive sources to decay to safe levels soon after use.

The generated isotopes are difficult to examine because of their short half-life. Thanks to the highly sensitive phase-imaging ion cyclotron resonance technique, masses for six lanthanum isotopes ...

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 ...