Alpha ray

a stream of alpha particles.
Historical Examples

The alpha ray carries a positive charge of double the ionic amount.
The Birth-Time of the World and Other Scientific Essays J. (John) Joly

Such is a brief summary of the climax of radioactive discovery:—the birth, life and death of the alpha ray.
The Birth-Time of the World and Other Scientific Essays J. (John) Joly

But in point of fact the ionisation due to an alpha ray is sui generis.
The Birth-Time of the World and Other Scientific Essays J. (John) Joly

The fundamental criterion of radioactive change is the expulsion of the alpha ray.
The Birth-Time of the World and Other Scientific Essays J. (John) Joly

This is due to the bombardment of the zinc sulphide by a type of ray called the alpha ray.
A Brief Account of Radio-activity Francis Preston Venable

noun
ionizing radiation consisting of a stream of alpha particles

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

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