Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

The Fossil Record02:56

The Fossil Record

23.0K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
23.0K
Nuclear Stability03:18

Nuclear Stability

20.5K
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...
20.5K
Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

34.6K
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.
34.6K
Nuclear Transmutation03:20

Nuclear Transmutation

12.9K
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...
12.9K
Diversity of Protists III01:27

Diversity of Protists III

2.1K
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
2.1K
Microbial Bioremediation of Uranium01:25

Microbial Bioremediation of Uranium

103
Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella,...
103

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Oxidized Hadean magmas and Archean mobile-lid tectonics revealed by Jack Hills zircon.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Late Cenozoic river reorganization related to tectonic extrusion formed the modern drainage system in southeastern Tibet.

Proceedings of the National Academy of Sciences of the United States of America·2025
Same author

Reply to: Reassessing gas generation from oil thermal cracking associated with the Emeishan Large Igneous Province.

Nature communications·2025
Same author

High temperature methane emissions from Large Igneous Provinces as contributors to late Permian mass extinctions.

Nature communications·2022
Same author

First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu.

Science advances·2022
Same author

Catalytic Synthesis of Polyribonucleic Acid on Prebiotic Rock Glasses.

Astrobiology·2022

関連する実験動画

Updated: May 2, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
12:22

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Published on: November 9, 2015

13.5K

絶滅した244Puは古代ジルコンで発見された.

Grenville Turner1, T Mark Harrison, Greg Holland

  • 1Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK. grenville.turner@man.ac.uk

Science (New York, N.Y.)
|October 2, 2004
PubMed
まとめ
この要約は機械生成です。

古代のジルコンはプルトニウム-244の腐敗の証拠を含み,初期の地球状態の洞察を提供します. この発見は,変形現象の年代測定を助け,惑星のプルトニウムとウランの比率を比較するのに役立ちます.

さらに関連する動画

Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
08:43

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

Published on: May 20, 2019

6.2K
Isolation of Quartz Grains for Optically Stimulated Luminescence OSL Dating of Quaternary Sediments for Paleoenvironmental Research
09:41

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

Published on: August 2, 2021

4.3K

関連する実験動画

Last Updated: May 2, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
12:22

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Published on: November 9, 2015

13.5K
Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
08:43

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

Published on: May 20, 2019

6.2K
Isolation of Quartz Grains for Optically Stimulated Luminescence OSL Dating of Quaternary Sediments for Paleoenvironmental Research
09:41

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

Published on: August 2, 2021

4.3K

科学分野:

  • 地質化学 地質化学
  • イソトープ地球化学 イソトープ地球化学
  • 惑星科学は惑星科学である.

背景:

  • 西オーストラリアのジャックヒルズのデトリタルジルコンは,古代の地質学的なサンプルです.
  • プルトニウム244 (Pu) は半減期が短く (8200万年) 地球の歴史の初期に絶滅していたはずである.
  • 分裂性クセノン同位体は,絶滅した放射性核素の崩壊の証拠として役立つ.

研究 の 目的:

  • 古代ジルコンのプルトニウム-244の"in situ"分解の証拠を見つけるために.
  • これらの発見を用いて,古代の変形現象の年代を決定する.
  • 太陽系値と比較するために,地上のプルトニウム/ウラン (Pu/U) の比率を決定する.

主な方法:

  • 41~42億年前の個々のジルコンの分析.
  • プルトニウム分解の指標として,分裂性クセノン同位体の検出.

主要な成果:

  • プルトニウム-244の in situ 腐敗の証拠は,古代のジルコンで発見されました.
  • 分析されたジルコンは41~42億年前のものである.
  • プルトニウム244は,地球が形成されてから6億年以内に絶滅していただろう.

結論:

  • 古代のジルコンは,絶滅した放射性核素を研究するための貴重なアーカイブです.
  • プルトニウム-244の崩壊産物の存在は,初期の地球の変形現象の年代測定を可能にします.
  • この研究は,初期の地上のPu/U比率を決定する方法を提供し,地外の値との比較を可能にします.