alfa-čestica

alfa-čestica

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 neutrons bound together.)

3) The nucleus of a 4He atom, consisting of two protons and two neutrons. Mass of α-particle 4.00260 amu.

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Kalbos dalis: noun
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Pramonės šaka / sritis: Astronomy
Category: General astronomy
Company: Caltech
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alfa čestica

Medical devices; Radiology equipment

(image) the nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry ...

alfa čestica

Semiconductors; Semiconductor quality

Helium nuclei emitted as a result of the radioactive decay of trace amounts of naturally occurring uranium and thorium found in semiconductor packaging materials. Alpha particles, ...

čestica

Pharmaceutical; Medical devices;

a tiny mass of material.

čestica

Electrical equipment; Fuel cell

Particulates, alternatively referred to as particulate matter (PM) or fine particles, are tiny particles of solid or liquid suspended in a gas.

aktinijum

Astronomy; General astronomy

soft, silvery-white, radioactive metal which glows in the dark

nuklearna veličina

Astronomy; General astronomy

See definition for m 2 , above.

orbitalni elementi

Astronomy; General astronomy

Parameters (numbers) that determine an object's location and motion in its orbit about another object. In the case of solar-system objects such as comets and planets, one must ...

orbita

Astronomy; General astronomy

The path of one object about another (used here for an object orbiting the sun).

meteori

Astronomy; General astronomy

Small rocky and/or icy particles that are swept up by the earth in its orbit about the sun. Also called "shooting stars", they travel across the sky in a very short time, from ...

m2

Astronomy; General astronomy

The magnitude value measured (or predicted) for a comet's nuclear condensation. Note that the true comet nucleus is rarely, if ever, directly observed from the earth because of ...