алфа честица

алфа честица

A particle that is commonly ejected from radioactive nuclei, consisting of two protons and two neutrons. Alpha particles are helium nuclei. Alpha particles have a mass of 6.644 655 98 × 10-27 kg or 4.001 506 1747 atomic mass units . (1998 CODATA values)

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Industry/Domain: Chemistry
Category: General chemistry
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алфа-честица

Astronomy; General astronomy

1) Nucleus formed by the α-process (q.v.) (see even-even nuclei.) 2) Particle first discovered in radioactive α decay, and later identified as helium nuclei (two protons and two ...

честица

Semiconductors; Silicon wafer

A small,discrete piece of foreign material or silicon not connected crystallography to the wafer.

честица

Pharmaceutical; Medical devices;

a tiny mass of material.

алфа

Software; Computer; Operating systems

The graphics state parameter that Quartz uses to determine how to composite newly painted objects to the existing page. At full intensity (alpha =1.0 ), newly painted objects are ...