Using a radioactive substance / Concerning radioactivity

Exhibiting radioactivity. / (figuratively, rare) Dangerous and disgusting, particularly of people or ideas.

Any radioactive substance.

plural of radioactive

Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.

plural of radioactivity

The process of determining the age of a material by estimating the amount of radioactive decay of one or more radioisotopes present in the material when it was formed.

Waste containing radioactive nuclides.

(physics) Any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more smaller nuclei.

(physics, chemistry, medicine) A radioactive isotope which, when injected into a chemically similar substance, or artificially attached to a biological or physical system, can be traced by radiation detection devices.