单词 | uranium lead |
释义 | uranium leadnoun 1The isotope lead-206; = radium G. 2Attributive (uranium-lead) designating a method of isotopic dating of rock based on measurement of the relative amounts of uranium-238 and -235 and of their ultimate decay products lead-206 and -207; (of dates, ages, etc.) obtained using this method. OriginEarly 20th century. |
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