There are two types of radiation. One is what you think of as being associated with nuclear energy and bombs, and emits particles as a byproduct of atoms decaying. Diode lasers certainly do not emit this form of radiation. The other type is electromagnetic radiation, and everything that produces radio waves and light emits this. Your lamp, your computer monitor, even your body (this is how FLIR cameras can see your body heat in the dark because heat is radiated as infrared light). In this way, diode lasers do emit radiation. Besides the laser, this scanner has a 2.4Ghz radio built in that also emits electromagnetic radiation.