1900 12 Oct. 551/1 The change from the enol to the keto form being promoted by ionizing solvents like water and alcohol, while non-ionizing solvents prevent or hinder it.
1939 55 24 These non-ionizing particles must be much more penetrating than photons.
1991 Jan. 14/1 Microwaves and radio waves are called non-ionizing radiation.