Which one of the following is not an ionizing radiation?

Ionising radiation is applied to radiation which has the ability to penetrate tissues and deposit its snergy within them.Includes - electro magnetic radiations(X rays ,gamma rays,) -corpuscular radiations (alpha paicles,beta paicles and protons) Non ionising radiation refers to electromagnetic radiations of wavelength longer than ionising.Include UV rays,visible light, IR rays,microwavecradiation. Parks textbook of preventive and social medicine.K Park. Edition 23.page no:744