different between radiation vs radioactivity

English

Etymology

Borrowed from Latin radiatio, radiationis.Morphologically radiate +? -ion

Pronunciation

• IPA^(key): /??e?.di.?e?.??n/
• (some US dialects) IPA^(key): /?a?.di.?a?.??n/

Noun

radiation (countable and uncountable, plural radiations)

1. The shooting forth of anything from a point or surface, like diverging rays of light.

   heat radiation

   • 2016, Donald R. Prothero, The Princeton Field Guide to Prehistoric Mammals (page 136)

     The second [canid group] is the radiation of dogs in South America that began when the first canids arrived about 3 Ma, after crossing the Panama land bridge (Fig. 5.4).

2. The process of radiating waves or particles.
3. The transfer of energy via radiation (as opposed to convection or conduction).
4. Radioactive energy.

Related terms

• radiate

Derived terms

Translations

See also

• nucleomitophobia

Anagrams

• antiradio

French

Etymology

Borrowed from Latin radiatio, radiationem.

Pronunciation

• IPA^(key): /?a.dja.sj??/

Noun

radiation f (plural radiations)

1. radiation (all meaning)

Related terms

• radier

Further reading

• “radiation” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

English

Etymology

radioactive +? -ity

Alternative forms

• radio-activity

Noun

radioactivity (usually uncountable, plural radioactivities)

1. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
2. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.

Related terms

• radiation

Translations

See also

• half-life

Further reading

• Radioactive decay on Wikipedia.Wikipedia