關於 carbon-14 ，我們在網路上蒐集到這些相關的討論、資訊與評價

#11. 博客來-Carbon 14

Carbon 14 is the result, a counterpoint of serious and ironic excavations into the mythic and the personal past of a middle-aged woman. Although these poems ...

#12. 碳-14測試法（Carbon-14 dating）

... 14測試法（Carbon-14 dating）. 碳-14測試法是考古學家用來鑑定一些源自生命體的古物的一個相當可靠方法，它的準繩度大約可達五萬多年之久遠。主要用來對一些物體如骨頭 ...

#13. CHEBI:36927 - carbon-14 atom

Carbon -14, C-14, 14C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its ...

#14. 博客來-Carbon 14

書名：Carbon 14，語言：英文，ISBN：0870231707，作者：Deagon, Ann，出版日期：1975/02/01，類別：文學.

#15. Carbon-14 | CH4 | CID 26873

Carbon -14 | CH4 | CID 26873 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, ...

#16. 'Perhaps the most important isotope': how carbon-14 ...

Carbon -14 has six protons and eight neutrons in its nucleus. By contrast, most of the carbon in our bodies and in the outside world, known as ...

#17. Management of waste containing tritium and carbon-14

Carbon -14 is one of these radionuclides. The major 14C producing neutron activation reactions in nuclear power reactors are: (a) The 14N(n,p)14C ...

#18. carbon 14 - Yahoo奇摩字典搜尋結果

a long-lived naturally occurring radioactive carbon isotope of mass 14, used in carbon dating and as a tracer in biochemistry.

#19. Carbon 14 - an overview

Carbon -14 is a short-lived radioactive nuclide compared to the longer-lived radioactive isotopes described previously (Table I). But, 14 C (radioactive carbon or ...

#20. Carbon 14 - an overview

Traditional 14C dating quantifies the depletion in 14 C since death and is widely used to date bones older than 300 years. Atmospheric testing of nuclear weapons ...

#21. Carbon Cycle Greenhouse Gases

The Basics: 14 C and Fossil Fuels. Tracer for Emissions. Carbon-14 (or 14 C) is also known as radiocarbon, because it is the only carbon isotope that is ...

#22. 碳-14分析可以控管天然來源產品品質

... 14分析。 延伸閱讀: Identifying Fraudulent Natural Products: A Perspective on the Application of Carbon-14 Analysis – Journal of Agricultural and Food ...

#23. ThinkPad X1 Carbon Gen 11 | 14 吋超輕型的強大Intel® ...

ThinkPad X1 Carbon Gen 11 (14″ Intel) ... 成功登記30天內購物滿NT$75,000 可獲ThinkVision C24-40 23.8" 顯示器或Lenovo Go USB-C 筆記型電腦行動電源(20000 mAh) 。 選購 ...

#24. Carbon-14

Carbon -14. Long Lived Radionuclide. Half-life. : 5730 years. Type of Emitter. : Beta. Beta Energy. : 0.156 MeV. Travel Distance in air. : 24.2 cm or 9.54 inches.

#25. Atmospheric carbon-14 measurements reveal natural ...

Carbon -14 is produced in the stratosphere by nuclear reactions of atmospheric nitrogen with thermal neutrons produced naturally by cosmic rays ( ...

#26. Radioactive Decay of Carbon-14 | PBS LearningMedia

Find out what it means for an isotope to be radioactive and how the half-life of carbon - 14 allows scientists to date organic materials. This video is available ...

#27. Carbon-14 | Office of Environmental Health and Safety

Physical Characteristics Half-life: 5730 years Emissions: Beta particles with a maximum energy of 156 keV and an average energy of 49 keV.

#28. carbon-14 - 維基詞典，自由的多語言詞典

carbon -14. 語言; 監視 · 編輯. 目次. 1 英語. 1.1 名詞. 1.1.1 近義詞; 1.1.2 相關詞彙. 英語編輯. 名詞編輯. 英語維基百科有一篇文章關於：. carbon-14.

#29. Carbon 14 dating 1 (video) - Khan Academy

Now the key (and really cool) thing here is that carbon - 14 is continuously produced in the atmosphere by cosmic rays. Neutrons produced by the cosmic rays hit ...

#30. Solving the Carbon-14 Mystery

Solving the Carbon-14 Mystery. Physicists figure out why the anthropological dating tool decays so slowly. 28 Jan 2008; ByPhil Berardelli. Big loss.

#31. Carbon-14

Carbon -14. Atomic No. Radionuclide, Class, Table 1. Occupational Values, Table 2 ... Carbon-14, Monoxide, –, 2E+6, 7E-4, 2E-6, –, –. Dioxide, –, 2E+5, 9E-5, 3E-7 ...

#32. Carbon-14 (C-14) - Biotrend

Carbon 14 or Barium carbonate is a radioactive isotope or radioisotope of carbon. Its mass number is 14 and it is noted C-14. Its core contains 6 protons ...

#33. Tracking fossil fuel emissions with carbon-14

The carbon in fossil fuels has been buried for millions of years and therefore is completely devoid of carbon-14. Careful laboratory analysis ...

#34. Carbon 14 Definition & Meaning

The meaning of CARBON 14 is a heavy radioactive isotope of carbon of mass number 14 used especially in tracer studies and in dating old ...

#35. DOE Explains...Isotopes

Carbon occurs naturally in three isotopes: carbon 12, which has 6 neutrons (plus 6 protons equals 12), carbon 13, which has 7 neutrons, and carbon 14, which has ...

#36. 碳-14定年結果 - YouTube

碳-14定年結果. 166 views · 2 years ago ...more. Beta Analytic. 421 ... Carbon - 14 Testing for Natural Products. Beta Analytic•479 views · 2:56.

#37. Carbon-14 Production in Nuclear Reactors

Carbon -14 is formed naturally by reaction of neutrons of cosmic ray origin in the upper atmosphere with nitrogen and, to a lesser extent, with oxygen and carbon ...

#38. Illustrated Glossary of Organic Chemistry - Carbon-14 (14C

Carbon -14 ( 14 C): The carbon isotope whose nucleus contains six protons and eight neutrons. This gives an atomic mass of 14 amu. 14 C is radioactive with a ...

#39. Lenovo Thinkpad X1 Carbon 14" Business Laptop with ...

Amazon.com: Lenovo Thinkpad X1 Carbon 14" Business Laptop with Windows 7 Professional (Windows 8.1 Professional License), 14 Inch Quad HD IPS Touchscreen ...

#40. Radiocarbon Dating

In 1946, Willard Libby proposed an innovative method for dating organic materials by measuring their content of carbon-14, a newly discovered radioactive ...

#41. How Carbon-14 Dating Works

Radiocarbon dating, or carbon dating for short, is a way of determining the age of certain archeological artifacts of a biological origin up to ...

#42. 放射性碳定年法

放射性碳定年法（Radiocarbon dating），又称“碳十四断代法”或者“碳—14年代测定法（Carbon-14 dating）”，是利用自然存在的碳14同位素的放射性定年法，用以确定原先 ...

#43. Lenovo ThinkPad X1 Carbon 14" Ultrabook - 3444-B8U

Amazon.com: Lenovo ThinkPad X1 Carbon 14" Ultrabook - 3444-B8U : 電子.

#44. 研究碳十四（Carbon-14）之放射性測定法及其重要應用

to the Researches in Geophysics and Archaeology. Abstract. Y. K. Tai and S. C. Lu. Radioactive carbon-14 contained in woods, coals, shells and ...

#45. RADIOCARBON DATING

HOW IS CARBON 14 CREATED Cosmic radiation (gamma rays) enter the Earth's atmosphere and bombard atmospheric atoms which they break apart to create free ...

#46. Carbon-14

Carbon -14, 14 C, or radiocarbon, is a radioactive isotope of carbon discovered on February 27, 1940, by Martin Kamen and Sam Ruben.

#47. Carbon dating hampered by rising fossil-fuel emissions

Altered carbon: Line chart showing the proportion of radioactive carbon-14 in atmospheric carbon. Source: Ref 1. The development also means ...

#48. People and Discoveries: Libby introduces radiocarbon dating

In 1940 Martin Kamen discovered radioactive carbon-14 (an isotope of carbon) and found that it had a half-life of about 5,700 years. Scientists had also found ...

#49. How do we know the build-up of carbon dioxide in ...

The record of carbon-14 in the atmosphere is complicated by nuclear bomb testing after 1950, which doubled the amount of radioactive carbon in ...

#50. C14 Dating Techniques – Coastal Systems Group

How do we use 14C dating? Carbon-14 ( 14C) dating is used to determine the age of organic material which we discover in our cores, such as ...

#51. Carbon-14

Carbon - 14 Data Sheet. Page 2 of 4. Revision Date: 09/27/18. Exposure Rates. Dose Rate from a 1.0 millicurie isotropic point source of C-14:.

#52. Applying Carbon-14 Dating to Recent Human Remains

Archaeologists have long used carbon-14 dating (also known as radiocarbon dating) to estimate the age of certain objects.

#53. Carbon-14 Dating - X-Rays

This page descibes what carbon dating is and how it can help determine the age of some objects.

#54. 碳-14

碳14（14. C）或放射性碳是碳元素的一種具放射性的同位素，於1940年2月27日由加州大學伯克利分校放射性實驗室（現勞倫斯伯克利國家實驗室）的馬丁·卡門（英語：Martin ...

#55. C-14 Standard Operating Procedures | Radiation Safety ...

C -14 Standard Operating Procedures. Introduction. Carbon-14 is a commonly used radionuclide with a half-life of 5,730 years, emitting only beta particles with ...

#56. Carbon-14 is a low energy beta emitter and even

Carbon -14 ( 14 C) safety information and specific handling precautions. General: Carbon-14 is a low energy beta emitter and even large amounts of this ...

#57. C14 IFAO: the method

Radiocarbon dating : what is Carbon 14? The chemical element carbon is one ... 14 6C >147N + ß - : gets created nitrogen 14, stable, with an energy emission in ...

#58. How do geologists use carbon dating to find the age of ...

Carbon dating is used by archeologists to date trees, plants, and animal remains; as well as human artifacts made from wood and leather; because ...

#59. C-14 lab - AWI

At its C-14 dating laboratory, AWI researchers are using radioactive carbon to determine samples' age. Aiding them in their efforts is one of ...

#60. Carbon-14 Spiked Worldwide Over 1200 Years Ago, And ...

In 774/775, tree rings show a spike in carbon-14 unlike anything else. At last, scientists think they know why.

#61. The Interesting Process To Create Carbon-14

To create carbon-14 alone, scientists must use chemical separation or synthesis to initiate a reaction. Quantities of carbon-14 can be formed in reactors or ...

#62. Radiocarbon helps date ancient objects—but it's not perfect

Over time, carbon-14 decays in predictable ways. And with the help of radiocarbon dating, researchers can use that decay as a kind of clock that ...

#63. Carbon 14 Dating: Complications and Mitigations

Carbon 14 dating is based on the idea that the carbon 14 to carbon 12 ratio in the atmosphere is constant over time. This also turns out to not be true. But, ...

#64. Carbon 14 decay

免費使用Desmos 精美的線上繪圖計算機來探索數學奧妙。功能包含繪製函數圖形和散點圖，視覺化代數方程式、新增滑桿，動畫圖檔等。

#65. C-14 carbon dating process

Historical artefacts like moa bones can be dated using a technique that measures the activity of the radioisotope carbon-14 still present in ...

#66. What is Radiation? The Ionized Atom

... carbon-14 would be abbreviated C-14. Because carbon-14 has six protons, it is still carbon, but the two extra neutrons make the nucleus unstable ...

#67. Carbon dating and analysis | Richard III

Radiocarbon dating is a commonly used technique which relies on the fact that, although 99% of carbon atoms have six protons and six neutrons (carbon-12), about ...

#68. Carbon Dating Gets a Reset

The carbon clock is getting reset. Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could ...

#69. Emissions from fossil fuels may limit carbon dating

But using fossil fuels pumps a type of carbon into the atmosphere that confuses the dating technique. Scientists say that by 2050, new clothes ...

#70. Radiocarbon dating | Laboratory Services

C -14 dating is based on the radioactive isotope of carbon that accumulates in organisms during their life and decays after their death, emitting radioactive ...

#71. The basics of Carbon 14

Radiocarbon, or carbon 14 (14C), is an unstable and slightly radioactive isotope of the element carbon. The stable isotopes are carbon 12 and ...

#72. Why Is Radiocarbon Dating Important To Archaeology?

The time taken for half of the atoms of a radioactive isotope to decay in Carbon-14's case is about 5730 years. Half-lives vary according to the isotope, for ...

#73. Carbon-14 Dating

These atoms have one or two more neutrons in the nucleus than most Carbon atoms. Scientists call the isotope with molar mass around 14, Carbon-14. Carbon-14 is ...

#74. Carbon-14 (14C) - Purdue Physics

Carbon -14 ( 14 C) is a long-lived radio-isotope of Carbon. Carbon-14 is called a cosmogenic nuclide, because it is created by energetic cosmic rays impacting ...

#75. Using carbon-14 and carbon-13 measurements for source ...

Using carbon-14 and carbon-13 measurements for source attribution of atmospheric methane in the Athabasca oil sands region.

#76. Preparation of Compounds Labeled with Tritium and Carbon-14

... carbon-14-labeled compounds. Measures of radioactivity per molar unit can be ... carbon-14 or tritium atoms within compounds depends primarily upon their ...

#77. Hot Carbon

There are few fields of science that carbon-14 has not touched. A radioactive isotope of carbon, it stands out for its unusually long half-life.

#78. Preparation of Water Sample for Carbon-14 Dating

A field procedure for isolating total dissolved-carbonate species is described. Carbon dioxide gas is evolved by add- ing sulfuric acid to the water sample; the ...

#79. Fossil Fuels May Bring Major Changes to Carbon Dating

Radiocarbon dating relies on the amount of radiocarbon, or carbon-14, remaining in an object to determine its approximate age. Radiocarbon is a ...

#80. Carbon Dating | Its importance & the physics behind it

This method is based on the idea of radiative decay of Carbon-14 isotopes over thousands of years. Through physics, scientists have discovered that radioactive ...

#81. Carbon Dating

Carbon dating is a widely-used method to establish the age of organic materials, things that were once living. · Living things have carbon in ...

#82. Recommendations for the Disposal of Carbon-14 Wastes

... Carbon - 14 - containing material may be buried provided it is covered with at least 4 ft of well compacted earth and does not exceed the following limits ...

#83. Radiocarbon dating

1: Formation of Carbon-14. 2: Decay of Carbon-14. 3: The “equal” equation is for living organisms, and the unequal one is for non-living ones, in which the C-14 ...

#84. Carbon-14 Measurements in the Atmosphere

... carbon - 14 content of the carbon dioxide sample and the carbon dioxide content of the aliquot of unprocessed air are The carbon dioxide is separated from ...

#85. Carbon-14 (T3D4997)

Carbon -14, 14C, or radiocarbon, is a radioactive isotope of carbon with a nucleus containing 6 protons and 8 neutrons.

#86. Radiocarbon dating

We will pre-treat the samples, isolate the carbon dioxide and convert it to graphite prior to AMS measurement; C-14 AMS analysis + target preparation from ...

#87. Carbon 14 Definition & Meaning

A naturally occurring radioactive isotope of carbon having six protons and eight neutrons in the nucleus. Carbon 14 is important in dating archaeological and ...

#88. Cosmogenic Carbon-14 In Glacial Firn and Ice

Carbon -14 is produced in the atmosphere from nitrogen-14, and is responsible for the 14 C content of atmospheric carbon dioxide (CO2), carbon monoxide (CO) and ...

#89. Dating Iron by the Carbon-14 Method

When iron is reduced from its ores in a blast furnace-at temperatures of ca. 1,4000 C-molten cast iron is pro- duced. The carbon content of this iron alloy may ...

#90. Carbon-14

Carbon -14 dating is a method, based on unprovable assumptions about the past, used to date things that contain carbon (e.g. fossils).

#91. Some interesting and exotic applications of carbon-14 ...

carbon -14 dating by accelerator mass spectrometry. To cite this article: A J T Jull 2013 J. Phys.: Conf. Ser. 436 012083. View the article online for updates ...

#92. Carbon-14 - laradioactivite.com - Radioactivity

Carbon gases formed with carbon 14 are chemically indistinguishable from gases with the ordinary carbon, carbon 12. The radioactive atom is absorbed by plants ...

#93. Answers to Creationist Attacks on Carbon-14 Dating

Question: How does carbon-14 dating work? Answer: Cosmic rays in the upper atmosphere are constantly converting the isotope nitrogen-14 (N-14) into carbon-14 (C ...

#94. Environmental Impact of Atmospheric Carbon-14 ...

During reactor running, 14C is produced in the fuel, moderator, coolant and structural materials. A small amount (estimated at only a few percent of the total) ...

#95. Radiocarbon Dating

It uses the naturally occurring radioisotope carbon-14 ( 14 C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years ...

#96. Uncovering modern paint forgeries by radiocarbon dating

A time lag of 2–5 y between the radiocarbon date and the date noted on the work of art is not uncommon (15). When the 14C age of the canvas ...

#97. Measurement of carbon 14 (C 14) - RISE

We can offer C 14 / Carbon 14 analysis of various materials such as fuels, plastics and chemicals. Purpose. As the only commercial laboratory in Europe, we have ...

#98. Regional Differences in Carbon-14 Data of the 993 CE ...

Cosmogenic nuclides such as 14C from tree rings and 10 Be and 36 Cl from ice cores are excellent proxies for the past extremely large solar ...

#99. The half-life of Carbon 14

The process of standardization consists of three parts: (1) A collaborative deter- mination by mass spectrograph of the isotopic ratio of C14 in carbon dioxide ...

#100. Chinese cave holds carbon dating 'Holy Grail' | Research

Chinese cave holds carbon dating 'Holy Grail' ... Stalagmites in a Chinese cave have given scientists all they need to reconstruct the historical ...