Neptunium-237

That one's my favorite! Neptunium-237 is a radioisotope added by NTM. It is mainly used in making Schrabidium batteries and Schrabidium fuel.

Production
It can be made by breeding U235 in a Breeding Reactor, or it can be found in a Desert Atom structure.

It may also be made by smashing Lithium with natural Uranium in a Cyclotron.

Uses
It is mainly used in Schrabidium fuels and Schrabidium energy storage. It can be turned into Pu238 in the breeding reactor.

It has decent operating power in the Breeding Reactor and Nuclear Furnace, but it itself cannot be used as reactor fuel, only an additive stabilizer to Schrabidium fuel.

It can be made into a pellet and used as fuel (rather weak, but cheap) for the Watz Power Plant.

Medium Enriched and Highly Enriched Neptunium Fuel for the RBMK, which both run on fast neutrons.

It can be used in the Custom Nuke. It contributes an impressive 30 (the highest of any ingot) to its nuclear stage.

Trivia

 * It only has one isotope, which is not specified, but considering it is produced from U235 and is used to make Pu238, it is most likely Neptunium-237.
 * It is fully confirmed to be Neptunium-237.
 * Its tooltip reads: "That one's my favorite!"
 * If you have a Polaroid, it will read: "Woo, scary!"


 * It can only be made in the Breeding Reactor, even though it exists in the earth’s crust (as a trace element).
 * According to its tooltip, it appears to be the "favorite" of the mod's creator. There is no explanation attached.
 * The second tooltip is likely an unknown reference.
 * Its usage in the custom nuke relates to the fact that it actually can be used in nuclear weapons, just nobody uses it for that use IRL.
 * Looks like Neptunium loves Schrabidium even more than Beryllium does.