a timing device in which beta particles from a radium source charge two electroscopic leaves, which discharge at regular intervals each time they…
单词 | θ79416 |
释义 | the world > matter > physics > atomic nucleus > radioactivity > beta radiation > [noun] > device utilizing (1) radium clock1904 a timing device in which beta particles from a radium source charge two electroscopic leaves, which discharge at regular intervals each time they… |
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