 The idea is that radiation detectors are already in place at national borders, and now they will pick up on these isotopes and help authorities arrest poachers and traffickers. The professor who heads up the project says this will make it significantly easier to intercept torrents being taken over the border. He says they're just piggybacking off the technology that is already in place to prevent nuclear terrorism. Researchers also want to make clear that the dose of radiation is very low.