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Alpha decay is one type of radioactive decay, in which an atomic nucleus emits an alpha particle, and thereby transforms (or "decays") into an atom with a mass number decreased by 4 and atomic number decreased by 2. A radioactive nucleus with zero spin can have no defined orientation, and hence emits the total momentum of its decay products isotropically (all directions and without bias).

However, for a collection of atoms, the collection's expected decay rate is characterized in terms of their measured decay constants or half-lives. The half-lives of radioactive atoms have no known upper limit, spanning a time range of over 55 orders of magnitude, from nearly instantaneous to far longer than the age of the universe.

When the nuclei of isotopes that are not naturally radioactive are bombarded with high-energy particles, the result is artificial radioisotopes that decay in the same manner as natural isotopes.

Each element remains radioactive for a characteristic length of time, ranging from mere microseconds to billions of years.

Some of the intermediate stages include the heavier elements thorium, radium, radon, and polonium.

The primary intent is to demonstrate how the half-life of a radionuclide can be used in practical ways to “fingerprint” radioactive materials, to “date” organic materials, to estimate the age of the earth, and to optimize the medical benefits of radionuclide usage. Remember that a radionuclide represents an element with a particular combination of protons and neutrons (nucleons) in the nucleus of the atom.

Except for gamma decay or internal conversion from a nuclear excited state, the decay is a nuclear transmutation resulting in a daughter containing a different number of protons or neutrons (or both).

When the number of protons changes, an atom of a different chemical element is created.

Alpha decay typically occurs in nuclei that are so big that they can’t be stable.

In alpha decay, the nucleus ejects a helium nucleus (alpha particle) composed of two neutrons and two protons, dropping the mass of the original nucleus by four mass units.

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