Official radioactive trefoil symbol triangle sticker

The trefoil symbol is used to indicate radioactive material. Radioactive decay is the process by which an atomic nucleus of an unstable atom loses energy by emitting ionising particles (ionising radiation). The emission is spontaneous, in that the atom decays without any interaction with another particle from outside the atom (i.e., without a nuclear reaction). Usually, radioactive decay happens due to a process confined to the nucleus of the unstable atom, but, on occasion (as with the different processes of electron capture and internal conversion), an inner electron of the radioactive atom is also necessary to the process. (source Wikipedia) Lookin for a certain (warning) sign sticker, but can't find it? Contact us, we'll make it for you! The contact button is above this description