関連する実験動画

Updated: Jul 12, 2026

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

トリチウムとアルゴンの放射能は,月面の物質に含まれている

E L Fireman, J C D'Amico, J C Defelice

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

    宇宙線相互作用による放射能は,月のサンプルで測定されました. 太陽の宇宙線は,月の土壌と岩石で観測されたトリチウムとアルゴンの放射能に大きく貢献しています.

    さらに関連する動画

    A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer07:52

    A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

    Published on: April 12, 2017

    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.
    Isotopes and Radioisotopes01:28

    Isotopes and Radioisotopes

    In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
    An isotope containing more...
    Nuclear Transmutation03:20

    Nuclear Transmutation

    Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
    Radioactivity and Nuclear Equations03:18

    Radioactivity and Nuclear Equations

    Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and 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 isotopes of the same element.
    A nuclide of an element has a specific number of protons and...
    Types of Radioactivity03:23

    Types of Radioactivity

    The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
    Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
    Nuclear Stability03:18

    Nuclear Stability

    Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
    To hold positively charged protons together in the...