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Doctors use so-called radioisotopes to pinpoint the growth of cancer in patients.

Less dramatically, everyday operations of nuclear reactors, mining and processing of uranium into fuel rods, and the disposal of spent nuclear fuel also require monitoring of radioisotope release.

In 1969, a group of South Asian women in Coventry were given chapatis containing a radioisotope.

The probes use three plutonium dioxide radioisotope thermoelectric generators.

Scientists say health impacts from consuming tritium and other radioisotopes through the food chain may be worse than from drinking it in water and further studies are needed.