RADIOACTIVITY

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does radioactivity mean? 

• RADIOACTIVITY (noun)
  The noun RADIOACTIVITY has 1 sense:

1. the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

  Familiarity information: RADIOACTIVITY used as a noun is very rare.

 Dictionary entry details 

• RADIOACTIVITY (noun)

Sense 1

Meaning:

The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

Classified under:

Nouns denoting natural processes

Synonyms:

radiation; radioactivity

Hypernyms ("radioactivity" is a kind of...):

emission (the release of electrons from parent atoms)

Hyponyms (each of the following is a kind of "radioactivity"):

corpuscular radiation; particulate radiation (a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons))

Derivation:

radioactive (exhibiting or caused by radioactivity)

 Context examples 

A unit of volumetric radioactivity concentration defined as a concentration of a radionuclide with an activity equal to one curie per unit volume equal to one liter.

(Curie per Liter, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one Curie of the sample with total mass of one kilogram.

(Curie per Kilogram, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one Curie of the sample with total mass of one gram.

(Curie per Gram, NCI Thesaurus)

The amount of radioactivity in a unit.

(Concentration of Radioactive Activity, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one becquerel of the sample with total mass of one milligram.

(Becquerel per Milligram, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one gigabecquerel of the sample with total mass of one milligram.

(Gigabecquerel per Milligram, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one gigabecquerel of the sample with total mass of one gram.

(Gigabecquerel per Gram, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one gigabecquerel of the sample with total mass of one microgram.

(Gigabecquerel per Microgram, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one becquerel of the sample with total mass of one microgram.

(Becquerel per Microgram, NCI Thesaurus)

A unit of specific radioactivity (massic activity) equal to activity of one becquerel of the sample with total mass of one gram.

(Becquerel per Gram, NCI Thesaurus)