an isotope of thorium (thorium-227) which is produced by beta decay of actinium and itself decays by alpha emission with a half-life of 18.7 days.
| 单词 | θ79561 |
| 释义 | the world > matter > physics > atomic nucleus > radioactive isotope > specific isotopes > [noun] > thorium (2) radioactinium1906 an isotope of thorium (thorium-227) which is produced by beta decay of actinium and itself decays by alpha emission with a half-life of 18.7 days. ionium1907 A radioactive isotope of thorium with mass number 230, produced by the alpha decay of uranium-234 and decaying in turn to radium-226 with a… |
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