関連する実験動画

Updated: Jul 12, 2026

High Precision Zinc Isotopic Measurements Applied to Mouse Organs
07:04

High Precision Zinc Isotopic Measurements Applied to Mouse Organs

Published on: May 22, 2015

月面のサンプルでの年齢測定と同位体豊富度測定

R K Wanless, W D Loveridge, R D Stevens

    Science (New York, N.Y.)
    |January 30, 1970
    PubMed
    まとめ

    岩石の試料の放射線年代測定により,結晶岩のK-Ar年齢は23億年,細岩のU-Th-Pb年齢は476億年であることが明らかになった. 同位体組成は,地上の値と一致する.

    さらに関連する動画

    Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research09:41

    Isolation of Quartz Grains for Optically Stimulated Luminescence (OSL) Dating of Quaternary Sediments for Paleoenvironmental Research

    Published on: August 2, 2021

    Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides08:43

    Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides

    Published on: May 20, 2019

    関連する概念動画

    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.
    Atomic Absorption Spectroscopy: Lab01:21

    Atomic Absorption Spectroscopy: Lab

    For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
     Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
    Isotopes01:12

    Isotopes

    Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.An element's atomic mass, or weight, is a...
    Atomic Mass01:52

    Atomic Mass

    Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are...