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alpha-ray source

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  • Alpha particle — A tiny mass of material composed of two protons and two neutrons. Alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes or even the layer of dead cells which normally protects the …   Medical dictionary

  • Alpha particle — Alpha particles (named after and denoted by the first letter in the Greek alphabet, α) consist of two protons and two neutrons bound together into a particle identical to a helium nucleus; hence, it can be written as He2+ or 42He2+. They are a… …   Wikipedia

  • Alpha Lyr — Alpha Lyrae Pour les articles homonymes, voir Véga (homonymie). α Lyrae Vue infrarouge du disque de débris …   Wikipédia en Français

  • Alpha Lyrae — Pour les articles homonymes, voir Véga (homonymie). α Lyrae Vue infrarouge du disque de débris …   Wikipédia en Français

  • Source (game engine) — Source engine …   Wikipedia

  • Alpha-particle spectroscopy — One method for testing for (and measuring) many alpha emitters is to use alpha particle spectroscopy. For methods for gamma rays and beta particles, please see gamma spectroscopy and liquid scintillation counting respectively. Experimental… …   Wikipedia

  • X-ray photoelectron spectroscopy — [ right|thumb|350px|Basic components of a monochromatic XPS system.] X ray photoelectron spectroscopy (XPS) is a quantitative spectroscopic technique that measures the elemental composition, empirical formula, chemical state and electronic state… …   Wikipedia

  • X-ray crystal truncation rod — scattering is a powerful method in surface science, based on analysis of X ray diffraction patterns from a crystalline surface. For an infinite crystal, the diffracted pattern is concentrated in delta function like Bragg peaks. Presence of… …   Wikipedia

  • X-ray astronomy — X rays start at 0.008 nm and extend across the electromagnetic spectrum to 8 nm, over which the Earth s atmosphere is opaque. X ray astronomy is an observational branch of astronomy which deals with the study of X ray observation and detection… …   Wikipedia

  • List of Alpha Phi Alpha brothers — The list of Alpha Phi Alpha brothers (commonly referred to as Alphas cite web |url=http://www.union.arizona.edu/csil/greek/chapters/view.php?id=39 |title=Arizona Student Unions |work=Fraternity and sorority programs |publisher=University of… …   Wikipedia

  • Beta Ray Bill — Superherobox| caption= The Mighty Thor #337 (Nov. 1983). Art by Walter Simonson. comic color=background:#ff8080 character name=Beta Ray Bill real name=Simon Walters species=Korbinite publisher=Marvel Comics debut= Thor #337 (Nov. 1983)… …   Wikipedia

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