Ultraviolet radiation is the highest energy non-ionizing radiation.

• A. False
• B. Ultraviolet radiation is ionizing
• C. It is non-ionizing but not the highest energy
• D. Ultraviolet radiation is the highest energy non-ionizing radiation

Answer: (D)

Ultraviolet radiation sits at the high-energy end of the non-ionizing part of the electromagnetic spectrum. Photon energy increases as wavelength shortens, so ultraviolet light carries more energy than visible or infrared light. Ionizing radiation, which can remove electrons from atoms, includes X-rays and gamma rays; ultraviolet photons, though energetic, are not generally classified as ionizing in typical occupational hygiene contexts. That’s why the statement that ultraviolet is non-ionizing but the highest energy within that non-ionizing group is correct. Saying it’s ionizing or that there’s a higher-energy non-ionizing category would not fit how these terms are typically used.