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alpha particle

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
alpha particle
n.
A positively charged nuclear particle, indistinguishable from a helium atom nucleus and consisting of two protons and two neutrons.

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[alpha]] is the propagation direction of the alpha particle, followed by ([alpha], n) reactions, can lead to false asymmetries in the CsI detectors, estimated at the 2 X [10.
Each of those putative atoms of element 115 disintegrated within fractions of a second by spontaneously ejecting an alpha particle, which contains two protons and two neutrons.
2 MeV (an acknowledged overestimate because of the infinitely thick source geometry), we calculated a radiation dose rate averaged over a 50-[micro]m tissue thickness surrounding the implant (adequate to capture all of the alpha particle energy emitted by both uranium- and thorium-series isotopes) to be 4.
 
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