Reduced Thorium Production Output to 0.1 (from 1) (90% reduction)
Reduced Thorium Production Input with 90% as well.
Increased production time to 1 (from 5) (80% reduction)

This is done so Thorium can still be produced when playing with "Realistic" inventory settings (x1), where before you would need more gravel than the assembler could contain.
With these changes, the amount of Thorium you get from X amount of gravel is identical, but you'll get it in smaller steps.

(Thanks to TokMor for letting me know about this issue)

Changed texture from no texture to default reactor texture. I'm still figuring out how to edit the texture, but until then I felt this would be better than having a grey clay model.