Thorium
From Memory Alpha, the free Star Trek reference.
| Name: | Thorium |
| Symbol: | Th |
| Atomic Number: | 90 |
Thorium is an element, number 90 on the periodic table, a member of the actinide series. (DS9: "The Siege")
When Benjamin Sisko asked Miles O'Brien to give his son some engineering experience, but not make it too easy, O'Brien replied that he would have Jake "up to his elbows in thorium grease." (DS9: "Paradise")
In 2370, the Maquis Sakonna asked Quark to obtain for her some cobalt-thorium devices, amongst other weapons. (DS9: "The Maquis, Part I")
On the mirror universe Terok Nor in 2370, the mirror Miles O'Brien told Odo that the station's thorium containment cells needed to be upgraded. The Kira Nerys and Julian Bashir from this universe later used a thorium leak as cover from their escape. (DS9: "Crossover")
The technology of the Caatati is dependent on thorium isotopes. When the Borg assimilated their homeworld, they lost the knowledge to synthesize thorium. In 2374, Seven of Nine provided the surviving Caatati with an energy matrix to synthesize thorium, allowing them to become self-sufficient again. (VOY: "Day of Honor")
