radioactivity

Definitions

General English

• noun energy in the form of radiation from radioactive substances

Astronomy

• Particles and radiation emitted by the fission of unstable atomic nuclei

Electronics

• The spontaneous disintegration of unstable atomic nuclei, such as those of uranium or curium, mainly through the emission of alpha, beta, or gamma rays. Also called decay (2).
• A specific instance of radioactivity (1), such as that occurring when an atom of uranium-238 emits an alpha particle to form an atom of thorium-234. Also called decay (3).
• The reduction over time of the radioactivity of a substance, due to radioactivity (1). Also called decay (4).
• synonymradioactive decay
• synonymradioactive disintegration

Medical

• noun energy in the form of radiation emitted by a radioactive substance

Military

• noun radiation given off by a radioactive substance

General Science

• noun a gradual disintegration of the nucleus of radioactive matter

Nearby Definitions of “radioactivity”

• radiator
• radical
• radio
• radio astronomy
• radio telescope
• radioactivity
• RAID
• rail
• rake
• ram
• Ramlila

Contexts for “radioactivity”

10 definitions in context
• General English
• Astronomy
• Electronics
• Medical
• Military
• General Science