radioactivity

Alternative forms

radio-activity

Etymology

From radioactive +‎ -ity or radio- +‎ activity.

Pronunciation

IPA^(key): /ˌreɪdɪəʊakˈtɪvɪti/
Audio (Southern England): (file)

Noun

radioactivity (usually uncountable, plural radioactivities)

Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
- 2020 March 8, Jacopo Prisco, “When beauty products were radioactive”, in CNN‎:
  Today, no one would intentionally smear radioactive materials on their face, but in 1933, the dangers of radioactivity were not yet fully understood.
The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.

Hyponyms

(types of radioactive decay):

Related terms

Units of radioactivity:

Translations

emission of ionizing radiation

Afrikaans: radioaktiwiteit
Basque: erradioaktibitate
Bulgarian: радиоактивност f (radioaktivnost)
Catalan: radioactivitat f
Chinese:
Mandarin: 放射性 (zh) (fàngshèxìng)
Czech: radioaktivita (cs) f
Danish: radioaktivitet (da) c
Dutch: radioactiviteit (nl) f
Esperanto: radioaktiveco
Faroese: geislavirkni n
Finnish: radioaktiivisuus (fi)
French: radioactivité (fr) f
Georgian: რადიოაქტიურობა (radioakṭiuroba), რადიაქტივობა (radiakṭivoba)
German: Radioaktivität (de) f
Greek: ραδιενέργεια (el) f (radienérgeia)
Hebrew: רדיואקטיביות (he) f (radioaktíviyut)
Hindi: विकिरणशीलता f (vikirṇaśīltā)
Icelandic: geislavirkni f
Irish: radaighníomhaíocht f
Japanese: 放射能 (ja) (ほうしゃのう, hōshanō)
Kazakh: радиоактивтік (radioaktivtık)
Korean: 방사능(放射能) (ko) (bangsaneung)
Lithuanian: radioaktyvumas m
Norwegian:
Bokmål: radioaktivitet m

Nynorsk: radioaktivitet m
Polish: radioaktywność (pl) f, promieniotwórczość (pl) f
Portuguese: radioatividade (pt) f
Romanian: radioactivitate (ro)
Russian: радиоакти́вность (ru) f (radioaktívnostʹ)
Scottish Gaelic: rèididheachd
Spanish: radioactividad (es) f
Swedish: radioaktivitet (sv) c
Tagalog: karagilapan
Thai: กัมมันตภาพรังสี (th)
Ukrainian: радіоактивність f (radioaktyvnistʹ)
Vietnamese: sự phóng xạ
Welsh: ymbelydredd m

radiation emitted

Afrikaans: radioaktiwiteit
Basque: erradioaktibitate
Belarusian: радыеакты́ўнасць f (radyjeaktýŭnascʹ)
Bulgarian: радиоакти́вност f (radioaktívnost)
Catalan: radioactivitat f
Chinese:
Mandarin: 放射 (zh) (fàngshè), 放射線 / 放射线 (zh) (fàngshèxiàn)
Czech: radioaktivita (cs) f
Dutch: radioactiviteit (nl) f
Finnish: radioaktiivisuus (fi)
French: radioactivité (fr) f
Georgian: რადიოაქტიურობა (radioakṭiuroba), რადიაქტივობა (radiakṭivoba)
German: Radioaktivität (de) f
Greek: ραδιενέργεια (el) f (radienérgeia)
Hebrew: קרינה (he) m (kriná)
Hindi: विकिरण (hi) m (vikiraṇ)
Irish: radaighníomhaíocht f
Italian: please add this translation if you can
Kazakh: радиобелсенділік (radiobelsendılık), радиоактивтік (radioaktivtık)
Korean: please add this translation if you can
Luxembourgish: Radioaktivitéit f
Norwegian:
Bokmål: radioaktivitet m

Nynorsk: radioaktivitet m
Portuguese: radioatividade (pt) f
Russian: радиоакти́вность (ru) f (radioaktívnostʹ)
Scottish Gaelic: rèididheachd f
Slovak: rádioaktivita f
Spanish: radioactividad (es) f
Swedish: radioaktivitet (sv) c
Thai: รังสี (th) (rang-sǐi)
Turkish: please add this translation if you can
Ukrainian: радіоакти́вність f (radioaktývnistʹ)
Urdu: please add this translation if you can
Welsh: ymbelydredd m

The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

Translations to be checked

Italian: ^{(please verify)} radioattività (it) f
Slovene: ^{(please verify)} radioaktivnost m

English