Traditional forms of medicine attribute special powers to rhinoceros horns, which is why that animal is hunted by poachers. A rhino horn is worth a lot of money on the black market, so poachers are highly motivated to kill rhinoceroses and remove their horns.
The Rhisotope Project is an innovative effort by conservationists to right back. Scientists propose to inject radioactive isotopes inside the horns of living rhinoceroses, thus making the horns trackable if removed and smuggled. Hack A Day explains:
The radiation from these would not be enough to cause any harm to the animal. But smuggling the horn through illicit channels becomes immensely more difficult as the tell-tale radioactive signature would be hard to hide.
Presumably the radioisotope that would be picked would be a Gamma or Beta emitter, as these are significantly harder to block than Alpha (large helium atoms) radiation. This radiation would make the horn, and any shipping container it would be placed into, light up light a Christmas tree on any of the radiation detectors used at borders and ports around the world.
Photo: Rhisotope Project