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单词 uranium lead
释义

uranium lead

noun
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.

Origin

Early 20th century.

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更新时间:2024/11/12 7:55:21