radioactivitynoun [ U ]
uk/ˌreɪ.di.əʊ.ækˈtɪv.ə.ti/us/ˌreɪ.di.oʊ.ækˈtɪv.ə.t̬i/the quality that some atoms have of producing a type of energy that can be very harmful to health
the energy produced by atoms in this way:
A dangerous amount of radioactivity was released into the environment last month.
Thesaurus: synonyms and related words
Physics: radiation & radioactivity
- alpha particle
- background radiation
- beta particle
- gamma radiation
- gamma ray
- half-life
- irradiate
- irradiation
- radiation
- radioactive
- radioisotope
- sievert
- tritium
- UVA
- UVB
- weak force