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| a helium atom nucleus, which consists of two neutrons and two protons and is ejected by certain radioactive elements |
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| an electron ejected from an atomic nucleus during the radioactive decay of certain nuclei |
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| the process of estimating the age of once-living material by measuring the amount of a radioactive isotope of carbon present in the material |
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| high-energy radiation emitted by the nuclei of radioactive atoms |
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| the time required for half the atoms in a sample of a radioactive isotope to decay |
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| the tendency of some elements, such as uranium, to emit radiation as a result of changes in the atomic nucleus |
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| the force of interaction between all nucleons, effective only at very, very, very close distances |
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| the conversion of an atomic nucleus of one element to an atomic nucleus of another element through a loss or gain of protons |
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