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| Technetium |
A metallic element obtained in the fission of uranium and by bombarding molybdenum with deuterons or neutrons. |
| Threshold Limit Value (TLVā) |
The maximum concentration of a substance to which most workers can be exposed without adverse effects. TLV is a term used exclusively by the American Conference of Governmental Industrial Hygienists (ACGIH). Other terms used to express the same concept are the MAC (maximum allowable concentration) and the OSHA equivalent PEL (permissible exposure limits). |
| Transuranic (TRU) |
An element with an atomic number greater than that of uranium (92). Neptunium (Np) has an atomic number of 93, plutonium (Pu) has an atomic number of 94, and americium (Am) has an atomic number of 95. All transuranics are man-made. Transuranics are found in DU as low-level contaminants from recycled nuclear fuel or waste material. |
| Tritium |
An isotope of hydrogen with one proton and two neutrons in the nucleus. Tritium is radioactive with a half-life of about 12 years and emits beta particles. It occurs naturally and is also man-made. |
