| tritium | <physics, radiobiology> Long lived radioactive isotope of hydrogen (half life 12.26 years). Weak emitter, very suitable for autoradiography and relatively easy to incorporate into complex molecules. (18 Nov 1997) |
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| tritium inventory | <radiobiology> Total quantity of tritium stored in a facility. Minimising this radioactive inventory is a key reactor design issue. (09 Oct 1997) |
| tritium-breeding ratio | <radiobiology> The amount of tritium generated by the breeding blanket of a D-T fusion reactor, divided by the amount of tritium burned in the reactor. A tritium breeding ration greater than unity is necessary for self-sufficient fueling. (09 Oct 1997) |