Since [the radioisotope battery]
it's a spacecraft component, it's super-optimized for low weight.
Think so?
It's shielded with tons (figuratively) of graphite, in case the rocket would have failed, the plutonium wouldn't have been set free. It would have fallen into the ocean as one block.
And, they surely haven't used 100% radioactive isotopes. I haven't looked it up, but it may be 30% radioactive plutonium isotopes out of total plutonium.
If you take near 100%, of course, it means less weight per Watt. (Just make sure not to reach the critical mass to create a chain reaction)
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