isotope

The minerals in the water contain trace amounts of uranium, which gradually decays into different uranium isotopes and eventually into a completely different element, thorium.

The thousands of meteorites in NASA collections can be divided into two main classes, based on their isotopes—the relative amounts of the same elements with different numbers of neutrons.

The isotopes in the Bom Jesus tusks revealed that these elephants lived in a mix of forests and savannas.

The researchers gave the critters a cocktail of chemicals labeled with isotopes, forms of elements having different masses.

Next, the researchers used the oxygen isotopes in the peat to track the waxing and waning of the region’s sea ice over thousands of years.

Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.

After eight years, traces of the isotope are expected to be extremely low.

The next step was to test whether Arafat had actually ingested or inhaled a quantity of the suspect isotope.

One of the isotopes of fission products, when fuel melts, is an iodine isotope, and it goes in your body through your thyroid.

All we've been able to find is some strange isotope but we don't know how to reproduce it or synthesize it.

Well, heavy water is made of one atom of oxygen plus two atoms of deuterium, which is the first isotope of hydrogen.

Why nail the "power metal" down to an isotope of gold with an atomic weight of 197?

There must be another one in either wing, for the isotope plant and the cartridge-case plant.

An isotope is just a different variety of the ordinary kind of atom in each element.