Gamma rays are the most energetic of all the em waves.

There is not really a clear division between X-rays and Gamma rays. Usually it is just a matter of the source determining if the wave is called an X-ray or a gamma ray.

Sources:

• • Decay of atomic nuclei.
  • Nuclear reactors
  • Cosmic rays – from outer space

Uses:

• • Radiotherapy

 

Greek symbol for gamma is γ

Ionising radiation that is also easily able to penetrate the body. Exposure can therefore be very dangerous.

Can be stopped by shielding with thickness of concrete or lead.

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Electromagnetic Spectrum

Links
https://en.wikipedia.org/wiki/Gamma_ray