The isotope ratio is directly used for comparing oils or gases.
It also bodes ill for the prospect of fusion using helium-3, a rare helium isotope that is missing a neutron.
The highest known magic number for neutrons alone is 126. Lead, with 82 protons and 126 neutrons, is thus "doubly magic" and the heaviest stable isotope in the periodic table.
The isotope does occur in nature but only extremely rarely.
It contains a tiny pellet of fuel made from an isotope of hydrogen called deuterium.
And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.
Although the easier ionization of radon leads one to expect the most extensive chemistry for that element, the high instability of even the most stable isotope has severely limited studies of it.
Is the isotope angular effect the primary or the secondary sputter effect?
Combined with oxygen isotope testing, the analysis suggested that at least one headless millet-eater came from Eastern Europe or somewhere with access to water from high altitudes.
Changes of nuclear mass and nuclear size cause isotope shifts.
So if supersymmetry is true, there should be less of this isotope around than the Standard Model predicts.
The isotope ratios tell you about the bird's diet. And that tells you where they dined.
Whatever caused the ancient fluctuations in isotope ratios, the researchers contend, those variations are a sign that climate back then varied from year to year just as it does today.
a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons.
And this again is the fissile isotope.
However, there is a very attractive reaction between deuterium and a light isotope of helium known as helium-3.
The city's challenge, chiefly, is to dispose of cesium-137, a radioactive isotope with a half-life of 30 years.
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