alpha particle

(redirected from Alpha emitter)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

alpha particle,

one of the three types of radiation resulting from natural radioactivityradioactivity,
spontaneous disintegration or decay of the nucleus of an atom by emission of particles, usually accompanied by electromagnetic radiation. The energy produced by radioactivity has important military and industrial applications.
..... Click the link for more information.
. Alpha radiation (or alpha rays) was distinguished and named by E. R. Rutherford in 1909, who found by measuring the charge and mass of alpha particles that they are the nuclei of ordinary helium atoms. Alpha particles consist of two protons and two neutrons (see nucleusnucleus,
in physics, the extremely dense central core of an atom. The Nature of the Nucleus
Composition

Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons.
..... Click the link for more information.
).

alpha particle

(α particle) The nucleus of a helium atom, i.e. a positively charged particle consisting of two protons and two neutrons. It is thus a fully ionized helium atom. Alpha particles are very stable. They are often ejected in nuclear reactions, including alpha decay in which a parent nucleus disintegrates – or breaks up – into an alpha particle and a lighter daughter nucleus.

alpha particle

[′al·fə ‚pärd·ə·kəl]
(atomic physics)
A positively charged particle consisting of two protons and two neutrons, identical with the nucleus of the helium atom; emitted by several radioactive substances.

alpha particle

a helium-4 nucleus, containing two neutrons and two protons, emitted during some radioactive transformations

alpha particle

References in periodicals archive ?
The therapeutic radiopharmaceuticals market is further segmented into beta emitters, alpha emitters, and brachytherapy.
Radiopharmaceuticals in the diagnostics market are categorized as SPECT and PET, whereas radiopharmaceuticals in the therapeutics market are categorized as beta emitters, brachytherapy isotopes, and alpha emitters.
Algeta is a world leader in the medical application of alpha emitters and in the development of the alpha-pharmaceuticals, an entirely new class of cancer treatment pharmaceuticals which incorporate these, using drug-coupled alpha emitters to target and destroy cancer cells.
Pu], or other alpha emitters were presumed negligible beyond distances of about 100 km from the plant (Fairlie and Sumner 2006; UNSCEAR 2000; WHO 2005a, 2005b).
The goal is to measure and possibly reduce the amount of inherent alpha emitters in the device and surrounding packaging.