We can profitably harness radioactive uranium for power. Can we do the same with radioactive carbon?
Short answer: No. Long answer: Without doing any math, my intuition says “no, carbon decay probably can’t be harnessed profitably.” As a general rule, if something can be done profitably, then someone is doing it. I call it the argumentum ad economicum, or the ideal gas law of economics. Industry expands to exploit all potential profit available to it. Scientifically