A naturally occurring beta-emitting radioactive isotope of potassium having a half-life of 1.3 billion years; it is the chief source of natural radioactivity of living tissue.
potassium-42 n. An artificially produced beta-emitting isotope of potassium having a half-life of 12.36 hours; it is used as a radioactive tracer in studies of potassium distribution in bodily fluids.
potassium-43 n. An artificially produced beta-emitting isotope of potassium having a half-life of 22 hours; it is used as a radioactive tracer in myocardial perfusion studies.
noun, Chemistry. 1. a white, crystalline, deliquescent, water-soluble powder, KC 2 H 3 O 2 , used chiefly as a reagent in analytical chemistry.
noun, Chemistry. 1. 1 (def 1). [al-uh m] /ˈæl əm/ noun, Chemistry. 1. Also called potash alum, potassium alum. a crystalline solid, aluminum potassium sulfate, K 2 SO 4 ⋅Al 2 (SO 4) 3 ⋅24H 2 O, used in medicine as an astringent and styptic, in dyeing and tanning, and in many technical processes. 2. […]