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Alpha particle   /ˈælfə pˈɑrtəkəl/   Listen
noun
alpha particle  n.  (Physics & Chem.) A particle emitted at high velocity from certain radioactive substances. It is identical to the helium nucleus, consisting of two protons and two neutrons. Rays of such particles are called alpha rays.





Collaborative International Dictionary of English 0.48


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"Alpha particle" Quotes from Famous Books



... by ejecting an Alpha particle, becomes Uranium X. This substance, by ejecting Beta and Gamma rays, becomes Radium. Radium passes through a number of further changes, as shown in the diagram, and finally becomes lead. Some radio-active substances disintegrate much faster than others. Thus Uranium changes very ...
— The Outline of Science, Vol. 1 (of 4) - A Plain Story Simply Told • J. Arthur Thomson


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