Huh, is this an example of the "nuclear battery" mentioned here? https://reactormag.com/a-tall-tail/ https://reactormag.com/a-tall-tail/ (Looking closer, yes,

Huh, is this an example of the "nuclear battery" mentioned here? https://reactormag.com/a-tall-tail/ https://reactormag.com/a-tall-tail/ (Looking closer, yes, they even explicitly mention hafnium, and it being a bust.)