| 单词 | mesothorium i |
| 释义 | > as lemmasmesothorium I Either of two radioactive nuclides in the thorium series: mesothorium I (symbol MsThI), the isotope of radium with mass number 228, produced by the alpha decay of thorium 232, or mesothorium II (symbol MsThII), the isotope of actinium with mass number 228, produced by the beta decay of mesothorium I. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > radioactive nuclide > [noun] > in thorium series mesothorium1907 1907 Jrnl. Chem. Soc. 92 359 The suggestion is made that thorium is not directly transformed into radiothorium, but into an intermediate product, ‘Mesothorium’, which then yields radiothorium. 1935 Jrnl. Royal Aeronaut. Soc. 39 857 The mesothorium preparation produces a point source of gamma radiation suitable for the inspection of thick metal objects for which X-ray investigation becomes very expensive. 1969 R. F. Lang tr. F. A. Henglein Chem. Technol. 546 Mesothorium is present in monazite to the extent of 1 mg per t, and serves as a substitute for radium. 1982 Sci. Amer. Nov. 160/3 Mesothorium usage in luminous products did increase, and indeed the paint used by the famous New Jersey dial painters contained a mixture of about 25 percent radium 226 and 75 percent mesothorium. < as lemmas |
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