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daft_pink 3 days ago

When can I get a smaller one to power my AirTag?

philipkglass 3 days ago | parent | next [-]

I know that this is a joke, but reactors cannot scale down that far. Unlike an electrical source powered by radioactive decay (like certain pacemakers [1]), the minimum mass for a nuclear reactor includes several kilograms of material. It's possible to shed neutron moderator mass by using high-purity fuel operating on fast fission, but these require more fuel to go critical so they still have multi-kilogram masses.

[1] "Plutonium powered pacemakers (1974) https://www.orau.org/health-physics-museum/collection/miscel...

Havoc 3 days ago | parent | prev | next [-]

That may actually be not that far away:

>first nuclear battery can deliver 100 microwatts of power and a voltage of 3V

>plans to produce a battery with 1 watt of power by 2025

https://www.independent.co.uk/tech/nuclear-battery-betavolt-...

dylan604 3 days ago | parent | prev [-]

I want one to take camping