NIH MeSH · D000512Phenomena and Processes

Alpha Particles

Also known asAlpha Particle · Particle, Alpha · Particles, Alpha · Alpha Rays · Alpha Ray · Ray, Alpha · Rays, Alpha · Alpha Radiation · Radiation, Alpha

Definition

Positively charged particles composed of two protons and two NEUTRONS, i.e. equivalent to HELIUM nuclei, which are emitted during disintegration of heavy ISOTOPES. Alpha rays have very strong ionizing power, but weak penetrability.

MeSH classification

G01.750.750.055

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Related concepts

Background Radiation

Radiation from sources other than the source of interest. It is due to cosmic rays and natural radioactivity in the environment.

Beta Particles

High energy POSITRONS or ELECTRONS ejected from a disintegrating atomic nucleus.

Source: NIH MeSH 2026 (D000512) — National Library of Medicine, public domain. View official MeSH record ↗