| 单词 | strontium 90 |
| 释义 | > as lemmasstrontium 90 strontium 90 n. a radioactive isotope of strontium which is one of the chief products of the fission of uranium 235, can pass from fall-out into plants and animals and hence into human tissue (where it is concentrated in bones and teeth), and has been used in radiotherapy. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > specific isotopes > [noun] > strontium strontium 901955 the world > matter > chemistry > elements and compounds > metals > specific elements > strontium > [noun] > radioactive isotope of strontium 901955 1955 Sci. News Let. 28 May 345/1 Strontium 90 is of particular interest because, being chemically similar to calcium, it may be deposited in human bone. 1961 Lancet 12 Aug. 366/1 Measurements of strontium 90 in human bone in the United Kingdom. 1978 Jrnl. Royal Soc. Arts 126 257/1 Two fission products, Strontium 90 and Caesium 137 have particularly awkward half-lives of about 30 years. < as lemmas |
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