radioactivity

3 ENTRIES FOUND:

ra·dio·ac·tiv·i·ty

noun \-ak-ˈti-və-tē\

Definition of RADIOACTIVITY

:  the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei; also :  the rays emitted

Origin of RADIOACTIVITY

International Scientific Vocabulary
First Known Use: 1899

Rhymes with RADIOACTIVITY

ra·dio·ac·tiv·i·ty

noun \-ak-ˈtiv-ət-ē\   (Medical Dictionary)
plural ra·dio·ac·tiv·i·ties

Medical Definition of RADIOACTIVITY

: the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei

radioactivity

noun    (Concise Encyclopedia)

Property exhibited by certain types of matter of emitting radiation spontaneously. The phenomenon was first reported in 1896 by Henri Becquerel for a uranium salt, and it was soon found that all uranium compounds are radioactive due to the uranium's radioactivity. In 1898 Marie Curie and her husband discovered two other naturally occurring, strongly radioactive elements, radium and polonium. The radiation is emitted by unstable atomic nuclei (see nucleus) as they attempt to become more stable. The main processes of radioactivity are alpha decay, beta decay, and gamma decay. In 1934 it was discovered that radioactivity could be induced in ordinary matter by artificial transmutation.

Browse

Next Word in the Dictionary: radioallergosorbent
Previous Word in the Dictionary: radioactive series
All Words Near: radioactivity

Seen & Heard

What made you want to look up radioactivity? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More