Definition

Noun: The process by which an unstable atomic nucleus loses energy by emitting radiation. This spontaneous transformation results in the nucleus changing into a different nuclide or a lower-energy state.

Usage

"Radioactive decay" is a scientific term used primarily in physics and chemistry. It describes a natural, random process at the atomic level. It is typically used as a singular, non-count noun, though types of decay can be pluralized (e.g., different radioactive decays).

Examples

• Scientific Context:
  • The radioactive decay of carbon-14 is used in radiocarbon dating.
  • Geologists study the rate of radioactive decay to determine the age of rocks.
• General Context:
  • The heat generated inside the Earth is partly due to radioactive decay in its core.

Advanced Usage

• "To undergo radioactive decay": This phrase is used to describe the action of a specific atom or isotope.
  • Uranium-238 will slowly undergo radioactive decay into lead-206 over billions of years.

Variants and Related Words

• Decay (noun/verb): The more general term; in physics, it is often used interchangeably with "radioactive decay."
  • The decay constant is a probability measure for this process.
• Radioactivity (noun): The property of substances that undergo radioactive decay.
• Disintegration (noun): A synonym often found in definitions, emphasizing the breaking apart of the nucleus.

Synonyms

• Nuclear disintegration
• Nuclear decay
• Atom disintegration

Related Phrases

• Decay chain/decay series: A sequence of radioactive decays.
  • The decay chain of uranium-238 involves over a dozen steps.
• Decay product/daughter product: The nuclide resulting from radioactive decay.
• Decay rate/half-life: Measurements describing the speed of the decay process.

Noun

1. the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation