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Blech. These are the grossest words.

alpha emitter

a radioactive isotope that emits alpha particles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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  • One such reaction uses alpha particles emitted by polonium-210 (or some other alpha emitter) to bombard the element beryllium.

    The Atomic Fingerprint Bernard Keisch

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