115 was added when manufactured ages ago and will supply the wisebots with energy for almost an eternity. No further need to refill, and is to be thrown away when batteries are depleted. ^___^ Anyway, less than 1 gramm of radioactive material will probably have little destructive-effect. The radioactivity is turned into energy by the wisebots directly, unlike in nuclear plants where there is heat generated and thus water is turned into steam is used to operate turbines.
As for niobium, it still remains quality conducting material on room temperature. Not superconducting, of course, I only mentioned that they still present one of the best conducting abilities available. Note that in today's electronics niobium is used only in alloys because of its immense production cost and rare availability.
As for niobium, it still remains quality conducting material on room temperature. Not superconducting, of course, I only mentioned that they still present one of the best conducting abilities available. Note that in today's electronics niobium is used only in alloys because of its immense production cost and rare availability.