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    In the presence of naturally radioactive isotopes and fission product...

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  • 因为稀有天然放射性同位素衰变产生所以可以用来测定十万以上岩石年龄采样

    Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope, it can be used to date rocks and samples more than 100,000 years old.

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  • 一种天然放射性同位素原子量4半衰期为5,780用于测定古代生物标本地质标本考古遗迹的标本年代

    A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.

    youdao

  • 一种天然放射性同位素原子量4半衰期为5,780用于测定古代生物标本地质标本考古遗迹的标本年代

    A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.

    youdao

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