1. Radiocarbon Dating - Wikipedia, The Free Encyclopedia Radiocarbon dating, or carbon dating, is a radiometric dating method that uses the naturally occurring radioisotope carbon14 (14 C) to determine the age of carbonaceous http://en.wikipedia.org/wiki/Radiocarbon_dating

Radiocarbon dating From Wikipedia, the free encyclopedia Jump to: navigation search Radiocarbon dating , or carbon dating , is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 C) to estimate the age of carbonaceous materials up to about 58,000 to 62,000 years. Raw, i.e. uncalibrated, radiocarbon ages are usually reported in radiocarbon years Before Present " (BP), "Present" being defined as 1950 CE . Such raw ages can be calibrated to give calendar dates. One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites. When plants fix atmospheric carbon dioxide (CO ) into organic material during photosynthesis they incorporate a quantity of C that approximately matches the level of this isotope in the atmosphere (a small difference occurs because of isotope fractionation , but this is corrected after laboratory analysis). After plants die or they are consumed by other organisms (for example, by humans or other animals) the C fraction of this organic material declines at a fixed exponential rate due to the radioactive decay of C. Comparing the remaining

2. NS&T : Industry : Radiocarbon Dating Archeologists determine dates of samples, that were once alive (e.g. in bone, charcoal, leather) by a technique called radiocarbon dating , so called because this method of http://www.aboutnuclear.org/view.cgi?fC=Industry,Radiocarbon_Dating

3. Radiocarbon Dating Radiocarbon, or Carbon14, dating is probably one of the most widely used and best known absolute dating methods. It was developed by J. R. Arnold and W. F. Libby in 1949 http://id-archserve.ucsb.edu/Anth3/Courseware/Chronology/08_Radiocarbon_Dating.h

Chronological Methods 8 - Radiocarbon Dating Radiocarbon, or Carbon-14, dating is probably one of the most widely used and best known absolute dating methods. It was developed by J. R. Arnold and W. F. Libby in 1949, and has become an indispensable part of the archaeologist's tool kit since. Its development revolutionized archaeology by providing a means of dating deposits independent of artifacts and local stratigraphic sequences. This allowed for the establishment of world-wide chronologies. Where does C -14 Come From? Radiocarbon dating relies on a simple natural phenomenon. As the Earth's upper atmosphere is bombarded by cosmic radiation, atmospheric nitrogen is broken down into an unstable isotope of carbon - carbon 14 (C-14). Bombardment Reactions The unstable isotope is brought to Earth by atmospheric activity, such as storms, and becomes fixed in the biosphere. Because it reacts identically to C-12 and C-13, C-14 becomes attached to complex organic molecules through photosynthesis in plants and becomes part of their molecular makeup. Animals eating those plants in turn absorb Carbon-14 as well as the stable isotopes. This process of ingesting C-14 continues as long as the plant or animal remains alive. Diffusion Ingestion C-14 Decay Profile The C-14 within an organism is continually decaying into stable carbon isotopes, but since the organism is absorbing more C-14 during its life, the ratio of C-14 to C-12 remains about the same as the ratio in the atmosphere. When the organism dies, the ratio of C-14 within its carcass begins to gradually decrease. The rate of decrease is 1/2 the quantity at death every 5,730 years. That is the half-life of C-14. The animation provides an example of how this logarithmic decay occurs. Click on the "Show Movie" button below to view this animation.

4. Radiocarbon Dating | TripAtlas.com Radiocarbon dating is a radiometric dating method that uses the naturally occurring isotope carbon14 (14C) to determine the age of carbonaceous materials up to about 60,000 years1 http://tripatlas.com/Radiocarbon_dating

5. Radiocarbon Dating - Simple English Wikipedia, The Free Encyclopedia Radiocarbon dating, also known as the C–14 method, is a way of telling how old something is. It is a type of radiometric dating. The method uses the radioactive isotope carbon14. http://simple.wikipedia.org/wiki/Radiocarbon_dating

Radiocarbon dating From Wikipedia, the free encyclopedia Jump to: navigation search The amount of C in the atomsphere varies over time Atmospheric C, New Zealand and Austria The New Zealand curve is representative for the Southern Hemisphere, the Austrian curve is representative for the Northern Hemisphere. Atmospheric nuclear weapon tests almost doubled the concentration of C in the Northern Hemisphere. Radiocarbon dating , also known as the C–14 method , is a way of telling how old something is. It is a type of radiometric dating . The method uses the radioactive isotope carbon -14. Most organic matter contains carbon . Carbon has different isotopes , which are usually not radioactive; C is the radioactive one, its half life is about 5,730 years. This makes it possible to tell the age of substances that contain carbon. The method works to about 60,000 years old. Dates obtained are usually written as before present ('present' is 1950). Plants take up atmospheric carbon dioxide by photosynthesis , and are ingested by animals, so every living thing is constantly exchanging carbon-14 with its environment as long as it lives. Once it dies, however, this exchange stops. In 1958 Hessel de Vries showed that the concentration of carbon-14 in the atmosphere varies with time and locality. The relatively short-lived

6. Radiocarbon Dating - Wikinfo Radiocarbon dating is the use of a naturally occurring isotope of carbon to determine the age of organic materials. Carbon has two stable isotopes carbon12 (12 C), and carbon-13 (13 http://www.wikinfo.org/index.php/Radiocarbon_dating

Radiocarbon dating From Wikinfo Jump to: navigation search Radiocarbon dating is the use of a naturally occurring isotope of carbon to determine the age of organic materials. Carbon has two stable isotopes: carbon-12 ( C), and carbon-13 ( C). In addition, there are tiny amounts of the unstable isotope carbon-14 C) on earth. C has a half life of just under 6000 years, and so would have long ago vanished from the earth, were it not for its constant formation by cosmic ray impacts on nitrogen in the atmosphere. When cosmic rays enter the atmosphere they undergo various transformations, including the production of neutrons . The resulting neutrons participate in the following reaction: n C + H This reaction is relatively common, as nitrogen constitutes nearly 80% of Earth 's atmosphere. The highest rate of carbon-14 production takes place at altitudes of 30,000-50,000 feet, and at higher geomagnetic lattitudes, but the carbon-14 spreads evenly throughout the atmosphere and reacts with oxygen to form carbon dioxide . Carbon dioxide also permeates the oceans , dissolving in the water. Since it is assumed that the cosmic ray flux is constant over long periods of time, carbon-14 is assumed to be continuously produced at a constant rate and therefore that the proportion of radioactive to nonradioactive carbon throughout the Earth's atmosphere and oceans is constant.

7. Radiocarbon Dating: Facts, Discussion Forum, And Encyclopedia Article Radiometric dating is a technique used to date materials such as rocks , usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope http://www.absoluteastronomy.com/topics/Radiocarbon_dating

Home Discussion Topics Dictionary ... Login Radiocarbon dating Radiocarbon dating Topic Home Discussion Definition Overview Radiocarbon dating , or carbon dating , is a radiometric dating Radiometric dating Radiometric dating is a technique used to date materials such as rocks , usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates... method that uses the naturally occurring radioisotope carbon-14 Carbon-14 Carbon-14, C, or radiocarbon, is a radioactive isotope of carbon with a nucleus containing 6 protons and 8 neutrons. Its presence in organic materials is the basis of the radiocarbon dating method to date archaeological, geological, and hydrogeological samples... C) to determine the age of carbonaceous Carbonaceous Carbonaceous is the defining attribute of a substance rich in carbon. Particularly, carbonaceous hydrocarbons are very unsaturated, high-molecular-weight hydrocarbons, having an elevated carbon:hydrogen ratio.... materials up to about 58,000 to 62,000 years. Raw, i.e. uncalibrated, radiocarbon ages are usually reported in

8. Radiocarbon Dating A selection of articles related to Radiocarbon dating Radiocarbon dating Oceanography Dictionary radiocarbon dating . Definition and meaning of radiocarbon dating http://www.experiencefestival.com/radiocarbon_dating

9. Radiocarbon Dating Summary And Analysis Summary | BookRags.com Radiocarbon dating summary with 19 pages of lesson plans, quotes, chapter summaries, analysis, encyclopedia entries, essays, research information, and more. http://www.bookrags.com/Radiocarbon_dating

10. Radiocarbon Dating Radiocarbon dating is a radiometric dating method that uses the naturally occurring isotope carbon14 to determine the age of carbonaceous materials up to ca 60,000 years. http://www.sciencedaily.com/articles/r/radiocarbon_dating.htm

Science Reference Share Blog Print Email Bookmark Radiocarbon dating Radiocarbon dating is a radiometric dating method that uses the naturally occurring isotope carbon-14 to determine the age of carbonaceous materials up to ca 60,000 years. See also: Materials Science Fossils Archaeology Within archaeology it is considered an absolute dating technique. For more information about the topic Radiocarbon dating , read the full article at Wikipedia.org , or see the following related articles: Carbon-14 read more Isotope read more ... read more Note: This page refers to an article that is licensed under the GNU Free Documentation License . It uses material from the article Radiocarbon dating at Wikipedia.org. See the page for more details. Related Stories New Technology For Dating Ancient Rock Paintings (March 16, 2009) read more Archaeological 'Time Machine' Greatly Improves Accuracy of Early Radiocarbon Dating (February 11, 2010) read more New Method Could Revolutionize Dating of Ancient Treasures (March 23, 2010) read more Modern Humans Or Neandertals? New Evidence Sheds Light On Cave Fossils' Age (May 20, 2005) read more The Eyes Have It: Researchers Can Now Determine When A Human Was Born By Looking Into The Eyes Of The Dead (January 30, 2008)

11. InterTran - Translate Between 1,482 Language Pairs Radiocarbon dating, or carbon dating, ice finish radiometric dating method that uses in spite of the fact that naturally occurring radioisotope carbon14 (14 C) dates back to http://www6.tranexp.com:2000/Translate/index.shtml?from=nor&to=eng&type=

12. Waikato Radiocarbon Dating Laboratory A national laboratory for radiocarbon dating http://www.radiocarbondating.com/

13. HowStuffWorks "How Carbon-14 Dating Works" Introductory tutorial. http://www.howstuffworks.com/carbon-14.htm

HSW.sm.loadPageInfo(5985); OAS_AD('TopBanner'); HowStuffWorks Search HowStuffWorks and the web Video Podcasts Blogs Quizzes Games RSS Adventure Animals Auto Culture ... Next Page How Carbon-14 Dating Works by Marshall Brain Print Cite Feedback ... Recommend Cite This! Close Please copy/paste the following text to properly cite this HowStuffWorks article: Inside this Article Introduction to How Carbon-14 Dating Works How Carbon-14 is Made Dating a Fossil Lots More Information ... See all Geologic Processes articles Geological Videos Up Next How Nuclear Radiation Works How Nuclear Power Works ­Discovery.com: Carbon-14 in Trees ­You probably have seen or read news stories about fascinating ancient artifacts. At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,000 years old. A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago. How do scientists know how old an object or human remains are? What methods do they use and how do these methods work? In this article, we will examine the methods by which scientists use radioactivity to determine the age of objects, most notably carbon-14 dating Carbon-14 dating is a way of determining the age of certain archeological artifacts of a biological origin up to about 50,000 years old. It is used in dating things such as bone, cloth, wood and plant fibers that were created in the relatively recent past by human activities.

14. Radiocarbon Dating: How Archaeologists Date Prehistoric Sites The introduction of radiocarbon (C14) dating in the 1950s led to a dramatic change in the way we view prehistory. New developments are providing more surprises. http://www.suite101.com/content/radiocarbon-dating-a71595

15. Informath—Douglas J. Keenan Dating related papers and articles by Douglas J. Keenan. http://www.informath.org/

Informath is a web site of Douglas J. Keenan. Peer-reviewed publications The fraud allegation against some climatic research of Wei-Chyung Wang doi Remarks Defence of planetary conjunctions for early Chinese chronology is unmerited ... East Asian History Short tutorials Basics of radiocarbon dating Disputes in statistical analyses Is a line trending upward? Other stuff Anatolian tree-ring studies are untrustworthy ", manuscript Tree-ring data at Queen's University Belfast " (its importance and inaccessibility). The Gillberg affair ", a medical research scandal in Sweden (working draft). " (for the USA). A cheque for $2.56+$0.32 from D.E. Knuth computer science knick-knack Letters to The Economist About the author: I used to do mathematical research and financial trading on Wall Street and in the City of London; I now study independently. This site was last updated on

16. Radiocarbon Dating: Definition From Answers.com n. The determination of the approximate age of an ancient object, such as an archaeological specimen, by measuring the amount of carbon 14 it contains. Also called carbon http://www.answers.com/topic/radiocarbon-dating

17. Radiocarbon WEB-info Extensive information concerning the radiocarbon dating method from Tom Higham, Radiocarbon Laboratory, University of Waikato, New Zealand. http://www.c14dating.com/

Welcome to radiocarbon WEB-info. Radiocarbon dating is the technique upon which chronologies of the late Pleistocene and Holocene have been built. This resource is designed to provide online information concerning the radiocarbon dating method. We hope it will be of occasional use to radiocarbon users and interested students alike. thomas.higham@archaeology-research.oxford.ac.uk INDEX Introduction Measurement Applications WWW Links ... Email LAST MODIFIED 16 May 2002 HTML DOCUMENT BY T. HIGHAM.

18. RADIOCARBON Home Page Radiocarbon, an international journal of radiocarbon and other isotope dating http://radiocarbon.org/

19. Radiocarbon Dating - Research And Read Books, Journals, Articles Radiocarbon Dating Scholarly books, journals and articles Radiocarbon Dating at Questia, world's largest online library and research service. Subscribe now and do better research http://www.questia.com/library/sociology-and-anthropology/archaeology/radiocarbo

20. Myths Regarding Radiocarbon Dating The field of radiocarbon dating has become a technical one far removed from the naive simplicity which characterized its initial introduction by Libby in the late 1940's. It is http://www.icr.org/article/myths-regarding-radiocarbon-dating/

Articles Bible Store (more options) Articles Send This Send This: by Email by Facebook by Twitter Myths Regarding Radiocarbon Dating by Gerald A. Aardsma, Ph.D. The field of radiocarbon dating has become a technical one far removed from the naive simplicity which characterized its initial introduction by Libby in the late 1940's. It is, therefore, not surprising that many misconceptions about what radiocarbon can or cannot do and what it has or has not shown are prevalent among creationists and evolutionists - lay people as well as scientists not directly involved in this field. In the following article, some of the most common misunderstandings regarding radiocarbon dating are addressed, and corrective, up-to-date scientific creationist thought is provided where appropriate. MYTH #1. Radiocarbon is used to date the age of rocks, which enables scientists to date the age of the earth. Radiocarbon is not used to date the age of rocks or to determine the age of the earth. Other radiometric dating methods such as potassium-argon or rubidium-strontium are used for such purposes by those who believe that the earth is billions of years old. Radiocarbon is not suitable for this purpose because it is only applicable: a) on a time scale of thousands of years and b) to remains of once-living organisms (with minor exceptions, from which rocks are excluded). MYTH #2 Radiocarbon dating has established the date of some organic materials (e.g., some peat deposits) to be well in excess of 50,000 years, thus rendering a recent creation (6 to 10 thousand years ago) impossible.

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

Page 1     1-20 of 74    1  | 2  | 3  | 4  | Next 20