Word

gamma ray

Meaning

A gamma ray is a form of high-energy electromagnetic radiation, produced in nuclear processes and energetic events in space.

How “gamma ray” is used

Electromagnetic radiation at the high-energy, short-wavelength end of the spectrum, including radiation emitted by atomic nuclei.123

Tone
Neutral; physics and astronomy.
Where you’ll see it
A countable noun, usually used in the plural, gamma rays. Cambridge defines the expression as a beam of gamma radiation. NASA describes gamma rays from radioactive decay, lightning and energetic astronomical sources.

Examples

  • Original illustrative example: The space telescope detected gamma rays from a distant source.
  • Original illustrative example: In the physics lesson, we compared gamma rays with visible light.

Examples are written for this site to show typical use. They are not quotes.

Usage notes

  • Gamma rays are electromagnetic radiation, not a stream of material particles such as alpha particles. OpenStax describes them as electromagnetic waves; NASA places them at the shortest-wavelength, highest-energy end of the spectrum.
  • Gamma rays and X-rays can overlap in frequency and energy. In the nuclear-physics convention explained by OpenStax, their source distinguishes them: gamma radiation comes from nuclear processes, whereas X-rays can come from electronic transitions or fast-electron collisions. There is no single fixed energy cutoff separating every use of the two names.
  • Astronomy also uses gamma rays as a high-energy spectral category. NASA lists sources including neutron stars, supernovae and regions around black holes, so the nuclear-physics description should not be read as excluding all other astronomical production processes.
  • This entry explains the scientific term only; it does not give medical, treatment or radiation-handling advice. All examples are original illustrations, not reports of observations we made.

Origin

Origin not verified.

Sources

  1. gamma ray, Cambridge Dictionary

    dictionary.cambridge.orgAccessed Back to text

    https://dictionary.cambridge.org/dictionary/english/gamma-ray

  2. Gamma Rays, NASA Science

    science.nasa.govAccessed Back to text

    https://science.nasa.gov/ems/12_gammarays/

  3. 24.3 The Electromagnetic Spectrum, College Physics 2e, OpenStax

    openstax.orgAccessed Back to text

    https://openstax.org/books/college-physics-2e/pages/24-3-the-electromagnetic-spectrum