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| carbon 14 |
a radioactive isotope of carbon that has a half-life of about 5,700 years and whose presence in rock, fossils, and other archaeological specimens enables them to be dated. |
| deuterium |
an isotope of hydrogen that has one proton and one neutron in each nucleus; heavy hydrogen. (Cf. protium, tritium.) |
| heavy hydrogen |
an isotope of hydrogen with a mass number greater than one; deuterium. |
| ionium |
a naturally occurring radioactive isotope of the chemical element thorium. |
| neutron |
an elementary particle having no charge, spin of one-half, and mass approximately equal to a proton, present in the nucleus of all atoms except the common isotope of hydrogen. |
| protium |
the nonradioactive, most common isotope of hydrogen, having one proton and no neutrons in the nucleus of each atom. (Cf. deuterium, tritium.) |
| radioactive |
of or pertaining to an unstable isotope or instruments used to handle unstable isotopes. [1/2 definitions] |
| radiocarbon |
a radioactive isotope of carbon, esp. the isotope that has a nuclear mass of fourteen daltons and is often used in determining the age of various organic materials; carbon 14. |
| radioisotope |
an unstable isotope that emits subatomic particles or energy in decaying to a more stable state. |
| thoron |
a radioactive isotope of radon produced in the disintegration of thorium. |
| tritium |
a radioactive isotope of hydrogen, usu. produced synthetically and used in nuclear weapons and radiobiology. (Cf. deuterium, protium.) |
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