| slovo | definícia |
alpha particle
(encz) | alpha particle,alfa částice |
alpha particle
(gcide) | alpha particle \alpha particle\ (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.
[Webster 1913 Suppl. +PJC] |
alpha particle
(wn) | alpha particle
n 1: a positively charged particle that is the nucleus of the
helium atom; emitted from natural or radioactive isotopes |
alpha particle
(foldoc) | alpha particle
Particles consisting of two protons and two neutrons
bound
together that can cause bit rot when they pass through an
integrated circuit.
One hypothesis to explain random bit drops in early Intel chips
was cosmic rays, so Intel created the World's
Largest Lead Safe, using 25 tons of the stuff, and tested one board
in the safe and an identical one outside.
They saw no difference. Further investigation demonstrated
conclusively that the bit drops were due to alpha
particle emissions from thorium (and to a much lesser degree uranium)
in the encapsulation material. Since it
is impossible to eliminate these, it became obvious that one has to
design memories to withstand these hits.
[Jargon File]
(2023-10-29)
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