| strontium | <chemistry> A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to colour pyrotechnic flames red. Symbol Sr. Atomic weight 87.3. Origin: NL. See Strontia. Source: Websters Dictionary (01 Mar 1998) |
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| strontium-85 | A radioactive strontium isotope with a half-life of 64.84 days; used in bone imaging. (05 Mar 2000) |
| strontium-87m | A radioactive strontium isotope with a half-life of 2.80 hours; used in bone imaging. (05 Mar 2000) |
| strontium-89 | A radioactive strontium isotope; a beta emitter with half-life of 50.52 days; used as a tracer in studies of strontium absorption by the body, strontium incorporation in bone, etc. (05 Mar 2000) |
| strontium-90 | A radioactive strontium isotope; a beta emitter with half-life of 29.1 years; a major component (about 5%) of the uranium fission products; it is incorporated into bone tissue where turnover is slow; used in the therapy of certain eye conditions (e.g., pterygia, traumatic corneal ulceration, etc.). (05 Mar 2000) |
| strontium isotopes | Stable strontium atoms that have the same atomic number as the element strontium, but differ in the atomic weight. Sr-84, 86, 87, and 88 are the stable strontium isotopes. (12 Dec 1998) |
| strontium radioisotopes | Unstable isotopes of strontium that decay or disintegrate spontaneously emitting radiation. Sr 80-83, 85, and 89-95 are radioactive strontium isotopes. (12 Dec 1998) |