Alpha particle
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English: 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.
Deutsch: Alphastrahlung oder α-Strahlung ist eine Art von ionisierender Strahlung, die bei einem radioaktiven Zerfall, dem Alphazerfall, auftritt.
Photos
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PU238
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Alpha Particle X-ray Spectrometer
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An alpha partcle emitter
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The trace of a single alpha particle obtained by Wolfhart Willimczik
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cloud chamber