alpha particle


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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.
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. 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.
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).

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 ?
this is done by special filters for absorbing radon inside the counter machine and the alpha particles emitted from it are counted by ionization chamber in counter machine.
210]Po accumulates in reproductive and embryonic and fetal tissues where a single alpha particle can kill or damage critical cells.
This makes the tower example look much more like the alpha particle examples: in the tower example, just as in those examples, we can distinguish the futures once we are willing to appeal to haecceitistic properties of points and particles.
Those who directly inhale tobacco smoke receive alpha particle bombardment totalling many reds over many years of smoking.
Rutherford decided (correctly) that the alpha particles occasionally struck a hydrogen nucleus (consisting of a single proton) and hurled it forward.
During the planning stages, the radiation dose rates to tissue within range of the alpha particles emitted by either the uranium- or thorium-series isotopes were estimated as follows.
Soft error rate testing (SERTEST) enables integrated device manufacturers (IDMs) and fabless vendors to determine the impact of cosmic rays and alpha particles on the reliability of their next-generation memory and system-on-chip (SoC) semiconductor devices.
Oxygen is produced by the combination of another alpha particle and carbon.
Instead of sending energy from a magnet to a subatomic particle, the particle (an alpha particle in this case) is pumping energy into the magnets.
He energized the national and international fusion communities to focus their attention on stability and transport issues associated with fast particles, and to develop techniques to observe alpha particle related phenomena in present experiments.
Each of those putative atoms of element 115 disintegrated within fractions of a second by spontaneously ejecting an alpha particle, which contains two protons and two neutrons.