But the slow decay in radiation intensity from a tabletop pulsar would make possible extremely long-range transmitters, giving far-off space probes an energy-efficient way to beam information back to earth.

ECONOMIST: Physics

Tritium would not be very dangerous just sitting in a tank somewhere -it would decay to very low levels of radiation in time.

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Radiation has to come from decay of radionuclides.

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And doctors may need to look into adjusting radiation doses for cancer therapies, as they are, in part, based on radioactive decay rates.

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