alpha ray

noun, Physics.
1.
a stream of alpha particles.
Also called alpha radiation.
Origin
1900-05
British Dictionary definitions for alpha radiation

alpha radiation

noun
1.
alpha particles emitted from a radioactive isotope

alpha ray

noun
1.
ionizing radiation consisting of a stream of alpha particles
alpha radiation in Medicine

alpha ray n.
A stream of alpha particles or a single high-speed alpha particle.

alpha radiation in Science
alpha ray  
A stream of alpha particles.
alpha radiation in Culture
alpha radiation [(al-fuh)]

Particles sent out by some radioactive nuclei, each particle consisting of two protons and two neutrons bound together. Alpha particles carry a positive charge. (See beta radiation and gamma radiation.)

Note: Alpha radiation, unlike gamma radiation, has low penetrating power; it can be stopped by clothing.