Deuterium is not radioactive, and does not represent a significant toxicity hazard.

So we're actually measuring each isotope as a different one.

Even though the nickel isotope, , is more stable, the iron isotope is an order of magnitude more common.

The principal natural isotope of aluminium is aluminium 27.

Because of this, there are concerns about the safety of thorium mantles.

For 80 of the chemical elements, at least one stable isotope exists.

For natural uranium, about 49 of its alpha rays are emitted by each of 238U atom, and also 49 by 234U (since the latter is formed from the former) and about 2.0 of them by the 235U.

The radiological toxicity of technetium (per unit of mass) is a function of compound, type of radiation for the isotope in question, and the isotope's half life.

Isotopes 59Co is the only stable cobalt isotope and the only isotope to exist naturally on Earth.

Further separation was carried out by ion exchange, yielding a certain isotope of curium.

Its most stable isotope 271Sg has a half life of 1.9 minutes.

The chemically identical uranium 235 has to be physically separated from the more plentiful isotope.

The shortest lived isotope is 258Sg which also decays through alpha decay and spontaneous fission.

Within a single element, the number of neutrons may vary, determining the isotope of that element.

The term isotope is formed from the Greek roots isos (ἴσος equal ) and topos (τόπος place ), meaning the same place .

In many cases members of the decay chain are far more radioactive than the original nuclide.

Americium is not synthesized directly from uranium the most common reactor material but from the plutonium isotope 239Pu.

Because apparently you can't have this fragile isotope of Lithium 6 in the atmospheres of sun like stars.

The radioactive isotope molybdenum 99 is used to generate technetium 99m, which is used for medical imaging.

The nucleus of the most common isotope of the hydrogen atom (with the chemical symbol H ) is a lone proton.

Hence after two half lives have passed only 25 of the isotope is present, and so forth.

Brown dwarfs are generally considered stars due to their ability to fuse deuterium, a heavier isotope of hydrogen.

Although many false claims of its discovery were made over the years, the element was first synthesized by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940.

The positive muon, in this context, can be considered a pseudo isotope of hydrogen with one ninth of the mass of the proton.

So if you engulf planet or large number of asteroids, you will have this Lithium 6 isotope in the spectrum of the star.

, the other stable hydrogen isotope, is known as deuterium and contains one proton and one neutron in its nucleus.

Rubidium 87 has a half life of years, which is more than three times the age of the universe of years, making it a primordial nuclide.

The primary decay mode before the most abundant isotope, 102Ru, is electron capture and the primary mode after is beta emission.

More recently, Fermionic condensate superfluids have been formed at even lower temperatures by the rare isotope helium 3 and by lithium 6.

Results also indicated that (in general) tritium has decreased over the years (up to 1997) due to the physical decay of bomb tritium in the Indian Ocean.

A relatively simple gun type fission weapon was made using uranium 235, an isotope that makes up only 0.7 percent of natural uranium.

Fission is a form of nuclear transmutation because the resulting fragments are not the same element as the original atom.

The half life of this isotope makes it suitable for geologic dating in the range of 60,000 to 1 million years.

The primary decay modes before the most abundant stable isotope, 142Nd, are electron capture and positron decay, and the primary mode after is beta minus decay.

The most stable isotope is 222Rn, which is a decay product of 226Ra, a decay product of 238U.

The final stage in the stellar nucleosynthesis process is the silicon burning process that results in the production of the stable isotope iron 56.

Twenty six elements have only a single stable isotope, while the largest number of stable isotopes observed for any element is ten, for the element tin.

This is an exponential decay process that steadily decreases the proportion of the remaining isotope by 50 every half life.

Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom.

The primary decay mode before the most abundant stable isotope, 48Ti, is electron capture and the primary mode after is beta emission.

KCl is useful as a beta radiation source for calibration of radiation monitoring equipment, because natural potassium contains 0.0118 of the isotope 40K.

In nuclear physics, a decay product (also known as a daughter product, daughter isotope or daughter nuclide) is the remaining nuclide left over from radioactive decay.

These properties are explained by the theory that the common isotope helium 4 forms a Bose Einstein condensate (see next section) in the superfluid state.

The primary decay mode of ytterbium isotopes lighter than the most abundant stable isotope, 174Yb, is electron capture, and the primary decay mode for those heavier than 174Yb is beta decay.

For example, 238U, the most abundant form of uranium, is fissionable but not fissile it undergoes induced fission when impacted by an energetic neutron with over 1 MeV of kinetic energy.