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Glossary S - T


RadTown Glossary
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Any installation, facility, or discrete, physically separate parcel of land, or any building or structure or portion thereof, that is being considered for survey and investigation.

Solid Waste Landfill

See municipal waste landfill.

Source or Sealed Source

Small, sealed metal cases containing radioactive materials used as references in research and industrial processes. They are often part of specialized industrial devices that measure quantities as the moisture content of soil or the density or thickness of materials. The sources are usually enclosed in a housing that prevents the escape of the radiation. Often referred to as radioactive sources or sealed sources.

Spent Nuclear Fuel

Nuclear reactor fuel that has been used to the extent to that it can no longer effectively sustain a chain reaction

Stable Nucleus

A nucleus in which the forces among its particles are balanced. See unstable nucleus as well.


See radiation protection standards.

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RadTown Glossary
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Terrestrial Radiation

Radiation that is emitted by naturally occurring radioactive materials, such as uranium, thorium, and radon in the earth. (see also naturally occurring radioactive materials)


A naturally occurring radioactive metal found at very low levels in soil, rocks, water, plants and animals. The most common naturally occurring forms of thorium are thorium-232, thorium-230 or thorium-228.


Elements with atomic numbers higher than uranium (92). For example, plutonium and americium are transuranics.


Tritium (chemical symbol H-3) is a radioactive isotope of the element hydrogen (chemical symbol H).

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