Glossary Terms

An exposure to radiation that occurred in a matter of minutes rather than in longer, continuing exposure over a period of time.

As low as is reasonably achievable: According to the NRC Regulations Title 10, Code of Federal Regulations, ALARA means making every reasonable effort to maintain exposures to radiation as far below the dose limits in this part as is practical consistent with the purpose for which the licensed activity is undertaken, taking into account the

The nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry more energy than gamma or beta particles, and deposit that energy very quickly while passing through tissue. Alpha particles can be stopped by a thin layer

To subject metal to high heat with a subsequent cooling to make it more malleable.

A statistical method of sampling by which a predetermined percentage of parts can be accepted as a process average.

Dosimeter used to monitor an area. Dose not assigned to a person.

Radiation from cosmic sources; naturally occurring radioactive materials, including radon (except as a decay product of source or special nuclear material), and global fallout as it exists in the environment from the testing of nuclear explosive devices. It does not include radiation from source, byproduct, or special nuclear materials regulated by the Nuclear Regulatory Commission.

Electrons ejected from the nucleus of a decaying atom. Although they can be stopped by a thin sheet of aluminum, beta particles can penetrate the dead skin layer, potentially causing burns. They can pose a serious direct or external radiation threat and can be lethal depending on the amount received. They also pose a serious

Deflection of the point, perceptible to feel.

A thin, flexible wires inserted into a vein, typically in the groin or neck. Used in procedures such as catheter ablation.