A naturally-occurring radioactive element. The minimum dose of radiation that will produce a detectable effect. All known transuranic elements are radioactive. Examples are neptunium, plutonium, americium, and curium.
Transuranic waste is long-lived, but only moderately radioactive.
A Type A package along with its limited radioactive contents which are limited to A 1 or A 2 value. A Type B package together with its radioactive contents.