释义 |
meso·thorium \|me]zō, |mē], ]sō+\ noun Etymology: New Latin, from mes- + thorium : either of two radioactive products intermediate between thorium and radiothorium in the thorium series or a mixture of the two products obtained usually from thorium minerals (as monazite sand) and used as a substitute for radium especially in luminous paints: a. : an isotope of radium — called also mesothorium 1; symbol MsTh1 or Ra228 b. : an isotope of actinium — called also mesothorium 2; symbol MsTh2 or Ac228 |