alpha ray


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Related to alpha ray: beta ray

al·pha par·ti·cle (α),

a particle consisting of two neutrons and two protons, with a positive charge (2e+); emitted energetically from the nuclei of unstable isotopes of high atomic number (elements of mass number from 82 up); identical to the helium nucleus.
Synonym(s): alpha ray

alpha ray

A ray composed of positively charged helium particles derived from atomic disintegration of radioactive elements. Its velocity is one tenth the speed of light. Alpha rays are completely absorbed by a thin sheet of paper and possess powerful fluorescent, photographic, and ionizing properties. They penetrate tissues less than beta rays.
See also: ray

al·pha par·ti·cle

(alfă pahrti-kĕl)
A particle consisting of two neutrons and two protons, with a positive charge; emitted energetically from the nuclei of unstable isotopes of mass number 82 and up.
Synonym(s): alpha ray.
References in periodicals archive ?
While bombarding light atoms with alpha rays, he observed outgoing protons whose energy was larger than that of the incoming alpha particles.
b) studying the properties of alpha rays (emitted by radioactive samples) by looking at the proportion that is absorbed by aluminium strips of varying thickness (experimenting on alpha rays and with radioactive atoms?
Radioactive elements such as uranium or thorium emit alpha rays that can cause soft errors.
The team succeeded in photographing alpha rays, emitted when radioactive material disintegrates, appearing in the picture as dark lines radiating from near the nuclei of the cells in bones, kidneys and lungs of the victims.