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... there is a lower limit imposed by the requirement for a critical mass.
About grapefruit sized is right for a fissionable mass. You'd need to add moderator and heat exchanger gubbins as well though, to make it usable.
Many years ago nuclear power could be carried in a backpack....sorry, you cannot view external links. To see them, please
REGISTER or LOGINwould make factory made nuclear energy devices common.
I'm wondering just how small a nuclear reactor can be? Is it possible that in the future we could power our laptops and other mobile devices with our own mini nuclear reactors? Maybe also our homes and cars?Roy P