Hafnium

The word "Hafnium" should be on the side instead Hf-178m2, which is its power source though Induced Gamma Emission.

It is one of the "X-Trains" found in Radio, the city I am working on. Some of the others are Plutonium-238 Pilot and Sr-90.

http://incompetech.c...ords=018&page=1 I listened to the one named "Cognitive Dissonance" many times while building it.