Fluorescence emitted by the fluorescent material commonly are non-radioactive light on the human body without causing harmful radiation.

The reason why there is the view that the fluorescent substances will harm the human body, because the luminous watches, key chains, signal lights added some glowing vinyl, such as high-end watches in the tritium gas and the use of tritium β lights inside, phosphorus sulfide a mixture of zinc. But the good news is that the release of tritium β decay only fast-moving electrons (ie β particles), penetration is weak, even a thin sheet of plexiglass are not passed, let alone penetrate the human body, so that only a large number of harmful if inhaled. In other words, as long as the regular manufacturers of qualified products, do not do wonderful things, driveway gravels not harm the human body.