alpha decay

noun

Pronunciation: /ˈælfə dɪˈkeɪ/

Definition

A type of radioactive decay in which an atomic nucleus emits an alpha particle, consisting of two protons and two neutrons, thereby decreasing its atomic number by two and its mass number by four.

Examples

• Uranium-238 undergoes alpha decay to transform into thorium-234.

• The heat generated inside the Earth is partly due to the alpha decay of radioactive isotopes in the mantle.

• Scientists use alpha decay as a reliable power source for deep-space probes.

Synonyms of alpha decay

Words with a similar meaning to alpha decay:

• alpha emission
• radioactive decay
• alpha disintegration
• nuclear transmutation

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