Gamma emission (γ emission)

Definition

Gamma emission ($\gamma$ emission) is a type of radioactive decay where an unstable nucleus releases excess energy in the form of gamma rays. Gamma rays are high-energy photons with no mass and no charge.

5 Must Know Facts For Your Next Test

1. Gamma emission often occurs after other types of decay, such as alpha or beta decay, to release excess energy.
2. Gamma rays have very high penetrating power and require dense materials like lead or concrete for shielding.
3. The nucleus undergoing gamma emission does not change its atomic number or mass number.
4. Gamma radiation is used in medical treatments, such as cancer radiotherapy, and in imaging techniques like PET scans.
5. The energy levels released during gamma emission are quantized, meaning they correspond to specific changes in the energy states of the nucleus.

Related terms

Alpha Decay:

A type of radioactive decay where an unstable nucleus emits an alpha particle (2 protons and 2 neutrons), decreasing its atomic number by 2 and mass number by 4.

Beta Decay:

A radioactive decay process where a neutron transforms into a proton with the emission of an electron (beta minus) or a proton transforms into a neutron with the emission of a positron (beta plus).

Photon: A quantum of light or other electromagnetic radiation carrying energy proportional to its frequency but having zero rest mass.