Britannica Sources used in this answer

Where do X-rays fit within the electromagnetic spectrum?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Diagram of the electromagnetic spectrum showing different types of waves arranged by wavelength and frequency, from gamma rays and X-rays to ultraviolet, visible light, infrared, microwave, TV/FM radio, shortwave radio, AM radio, and longwave radio. — X-ray The relationship of X-rays to other electromagnetic radiation within the electromagnetic spectrum.

X-rays occupy a specific high-energy region of the electromagnetic spectrum, situated between ultraviolet radiation and gamma rays.1

They are characterized by extremely short wavelengths, typically ranging from $10^{- 8}$ to $10^{- 12}$ metres, and high frequencies, spanning approximately $10^{16}$ to $10^{20}$ hertz. Because of these properties, X-rays possess significant energy, allowing them to penetrate various materials and ionize atoms, which distinguishes them from lower-energy forms of radiation like visible light. While they are a form of electromagnetic radiation, their high energy levels and short wavelengths place them far outside the range of human vision.234