Scientists injected two radioactive chips into a live rhino's horns at ... is led by researchers in the radiation and health physics unit at South Africa's University of the Witwatersrand.

James Larkin, director of the University of the Witwatersrand's radiation and health physics unit who spearheaded the initiative, told AFP he had put "two tiny little radioactive chips in the horn ...

Researchers in Johannesburg hope radioactive chips injected into rhino horns ... in the radiation and health physics unit at South Africa's University of the Witwatersrand. They told AFP that ...