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• Alpha_particle abstract "Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α. The symbol for the alpha particle is α or α2+. Because they are identical to helium nuclei, they are also sometimes written as He2+ or 42He2+ indicating a Helium ion with a +2 charge (missing its two electrons). If the ion gains electrons from its environment, the alpha particle can be written as a normal (electrically neutral) Helium atom 42He.The nomenclature is not well defined, and thus not all high-velocity helium nuclei are considered by all authors as alpha particles. As with beta and gamma rays/particles, the name used for the particle carries some mild connotations about its production process and energy, but these are not rigorously applied. Some science authors may use doubly ionized helium nuclei (He2+) and alpha particles as interchangeable terms. Thus, alpha particles may be loosely used as a term when referring to stellar helium nuclei reactions (for example the alpha processes), and even when they occur as components of cosmic rays. A higher energy version of alphas than produced in alpha decay is a common product of an uncommon nuclear fission result called ternary fission. However, helium nuclei produced by particle accelerators (cyclotrons, synchrotrons, and the like) are less likely to be referred to as "alpha particles".Alpha particles, like helium nuclei, have a net spin of zero. Due to the mechanism of their production in standard alpha radioactive decay, alpha particles generally have a kinetic energy of about 5 MeV, and a velocity in the vicinity of 5% the speed of light (see discussion below for the limits of these figures in alpha decay). They are a highly ionizing form of particle radiation, and (when resulting from radioactive alpha decay) have low penetration depth. They are able to be stopped by a few centimeters of air, or by the skin. However, so-called long range alpha particles from ternary fission are three times as energetic, and penetrate three times as far. As noted, the helium nuclei that form 10-12% of cosmic rays are also usually of much higher energy than those produced by nuclear decay processes, and are thus capable of being highly penetrating and able to traverse the human body and also many meters of dense solid shielding, depending on their energy. To a lesser extent, this is also true of very high-energy helium nuclei produced by particle accelerators.When alpha particle emitting isotopes are ingested, they are far more dangerous than their half-life or decay rate would suggest, due to the high relative biological effectiveness of alpha radiation to cause biological damage, after alpha-emitting radioisotopes enter living cells. Ingested alpha emitter radioisotopes (such as transuranics or actinides) are an average of about 20 times more dangerous, and in some experiments up to 1000 times more dangerous, than an equivalent activity of beta emitting or gamma emitting radioisotopes.".
• Alpha_particle thumbnail Alpha_Decay.svg?width=300.
• Alpha_particle wikiPageID "21787470".
• Alpha_particle wikiPageRevisionID "603910913".
• Alpha_particle caption Alpha_decay.
• Alpha_particle composition "2".
• Alpha_particle electricCharge "2".
• Alpha_particle hasPhotoCollection Alpha_particle.
• Alpha_particle name "Alpha particle".
• Alpha_particle spin "0".
• Alpha_particle statistics "Bosonic".
• Alpha_particle symbol "α, α2+, He2+".
• Alpha_particle subject Category:Helium.
• Alpha_particle subject Category:Radiation.
• Alpha_particle subject Category:Radioactivity.
• Alpha_particle comment "Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α. The symbol for the alpha particle is α or α2+.".
• Alpha_particle label "Alfadeeltje".
• Alpha_particle label "Alpha particle".
• Alpha_particle label "Alphastrahlung".
• Alpha_particle label "Particella α".
• Alpha_particle label "Particule α".
• Alpha_particle label "Partícula alfa".
• Alpha_particle label "Partícula alfa".
• Alpha_particle label "Promieniowanie alfa".
• Alpha_particle label "Α粒子".
• Alpha_particle label "Альфа-частица".
• Alpha_particle label "جسيم ألفا".
• Alpha_particle label "アルファ粒子".
• Alpha_particle sameAs Částice_alfa.
• Alpha_particle sameAs Alphastrahlung.
• Alpha_particle sameAs Σωματίδιο_άλφα.
• Alpha_particle sameAs Partícula_alfa.
• Alpha_particle sameAs Alfa_partikula.
• Alpha_particle sameAs Particule_α.
• Alpha_particle sameAs Partikel_Alfa.
• Alpha_particle sameAs Particella_α.
• Alpha_particle sameAs アルファ粒子.
• Alpha_particle sameAs 알파_입자.
• Alpha_particle sameAs Alfadeeltje.
• Alpha_particle sameAs Promieniowanie_alfa.
• Alpha_particle sameAs Partícula_alfa.
• Alpha_particle sameAs m.09ffm.
• Alpha_particle sameAs Q103517.
• Alpha_particle sameAs Q103517.
• Alpha_particle wasDerivedFrom Alpha_particle?oldid=603910913.
• Alpha_particle depiction Alpha_Decay.svg.
• Alpha_particle isPrimaryTopicOf Alpha_particle.