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Updated: Jun 24, 2026

Obtaining Specimens with Slowed, Accelerated and Reversed Aging in the Honey Bee Model
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Obtaining Specimens with Slowed, Accelerated and Reversed Aging in the Honey Bee Model

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阿贡-40-阿贡-39 阿波罗样本的年代 15555

E C Alexander, P K Davis, R S Lewis

    Science (New York, N.Y.)
    |January 28, 1972
    PubMed
    概括

    阿波罗15号基岩测年显示月球年龄为33亿年. 这一发现表明马基岩是由岩火活动造成的,而不仅仅是冲击融化.

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    Radioactive Decay and Radiometric Dating02:48

    Radioactive Decay and Radiometric Dating

    Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.