1. Carbon-14 Dating One of two or more atoms of the same element that have the same number of protons in their nucleus but different numbers of neutrons. carbon14 dating http://www.ndt-ed.org/EducationResources/CommunityCollege/Radiography/Physics/ca

Home Education Resources NDT Course Material Radiography Radiography Introduction History Present State Future Direction Physics of Radiography Nature of Penetrating Radiation X-rays Gamma Rays Activity ... Radiograph Interp - Castings Advanced Techniques Real-time Radiography Computed Tomography XRSIM References ... Quizzes Tracer: A substance, usually a labeled element, used to follow a complex sequence of biochemical reactions, as in an animal body, to locate diseased cells and tissues, to determine physical properties, etc. Half-life: The time required to for half the original nuclides to decay. Metabolic Processes: The chemical and physical processes continuously going on in living organisms and cells. Isotopes: One of two or more atoms of the same element that have the same number of protons in their nucleus but different numbers of neutrons.

2. How Accurate Are Carbon-14 And Other Radioactive Dating Methods? - ChristianAnsw Discussion on the inaccuracies found using the carbon14 dating method, and the various other radioactive dating methods. Plus evidence for a much younger http://www.christiananswers.net/q-aig/aig-c007.html

How accurate are Carbon-14 and other radioactive dating methods? See this page in: Hungarian Russian Spanish P eople who ask about carbon-14 ( C) dating usually want to know about the radiometric dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years. People wonder how millions of years could be squeezed into the biblical account of history. Clearly, such huge time periods cannot be fitted into the Bible without compromising what the Bible says about the goodness of God and the origin of sin, death and suffering —the reason Jesus came into the world (See Six Days? Honestly! Christians, by definition, take the statements of Jesus Christ seriously. He said, “But from the beginning of the creation God made them male and female” ( Mark 10:6 This only makes sense with a time-line beginning with the creation week thousands of years ago. It makes no sense at all if man appeared at the end of billions of years. We will deal with carbon dating first and then with the other dating methods. How the Carbon Clock Works Carbon has unique properties that are essential for life on earth. Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes. One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or

3. Howstuffworks "How Carbon-14 Dating Works" carbon14 dating is something that you hear about in the news all the time. Find out how carbon-14 dating works and why carbon-14 dating is so accurate! http://science.howstuffworks.com/carbon-14.htm

HowStuffWorks.com RSS Make HowStuffWorks your homepage Get Newsletter Search HowStuffWorks and the web: Science Earth Science Geology Geology is the study of the composition and physical properties of rocks, minerals, gems and other related earth materials, including diamonds and crystals. Related Categories: REFERENCE LINKS PRINT EMAIL How Carbon-14 Dating Works by Marshall Brain Inside This Article Introduction to How Carbon-14 Dating Works How Carbon-14 is Made Dating a Fossil Lots More Information See all ... articles 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.

4. Carbon-14 Dating A chemistry tutorial on the use of carbon14 dating suitable for high school students. http://www.ausetute.com.au/carbon14.html

Uses of Radioisotopes: Carbon-14 Dating Carbon has 3 isotopes, 2 of which are stable (carbon-12 and carbon-13) and one which is radioactive (carbon-14). Of these isotopes, the most common in nature is carbon-12. Production of Carbon-14 Carbon-14 is produced in the atmosphere by the interaction of neutrons produced by cosmic rays with the stable isotope of nitrogen, nitrogen-14: n N C H The carbon-14 atoms produced are then incorporated into carbon dioxide (CO ) molecules to produce CO molecules which mix with the most common CO molecules in the atmosphere. The CO enters plant tissue as a result of photosynthesis or absorption through the roots. C enters animal tissue when animals eat plants containing C. The amount of C produced in the atmosphere is balanced by the continual decay of C to produce N and a beta-particle C N e Radiocarbon dating When a plant or animal dies it stops taking in carbon-14 and radioactive decay begins to decrease the amount of carbon-14 in the tissues. The age of the plant or animal specimen containing carbon, such as wood, bones, plant remains, is determined by measuring the ratio of carbon-12 to carbon-14. The half-life of carbon-14 is 5730 years, because of its relatively short half-life, carbon-14 can only be used to date specimens up to about 45,000 years old. After this the amount of carbon-14 present in the sample is too small to be measured precisely. Carbon-14 can not be used to measure the age of very young specimens as the difference between the amount of carbon-12 and carbon-14 will not be sufficient to be detected.

5. Carbon-14 Dating Glossary of Religion and Philosophy carbon-14 dating. http://atheism.about.com/library/glossary/evolution/bldef_carbon14.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') You are here: About Agnosticism / Atheism Agnosticism / Atheism Atheism ... Help c-decay Back to Last Page Glossary Index Related Terms creationism Definition: A general method used for dating things in the natural world is to measure the level of radioactive isotopes still contained in them. Radioactive isotopes decay over time, so the older something is the less of those isoptopes researchers will be able to find. One of the most common and most well known of these isotopes is Carbon-14. Use of this, however, is limited to relatively young items of only a few thousand years because, when compared to other elements, it decays quickly. A failure to understand this leads some creationists to believe that the method as a whole is flawed. Also Known As: none Alternate Spellings: none Common Misspellings: none Related Resources: Is evolution a science? Is creationism a science? What is science? Is there evidence for either? Religious fundamentalists often attack evolution, but rarely from a positions of really understanding what evolution is and how it works. This FAQ will not only teach you more about the nature of evolution and evolutionary theory, but it will also explain some of the more common complaints and where they go wrong. Back to Last Page Glossary Index From Austin Cline Your Guide to Agnosticism / Atheism FREE Newsletter.

6. Giem, P. --- Carbon-14 Dating Models And Experimental Implications Any model of carbon14 dating must satisfy certain constraints. First, since carbon-14 dating is objective and reproducible, it cannot be ignored. http://www.grisda.org/origins/24050.htm

CARBON-14 DATING MODELS AND EXPERIMENTAL IMPLICATIONS Paul Giem, M.A., M.D. Loma Linda, California Origins WHAT THIS ARTICLE IS ABOUT Eight categories of models for converting carbon-14 dates into real time are discussed. Six of these models are based on a creation as described in Genesis and a short age of life on earth. Differences between the models are specified, especially those that are subject to experimental testing. Such features include (1) differences between ring years and radiocarbon years in trees that should be immediately postdiluvian by creationist theories, (2) the accuracy, or lack thereof, of the dendrochronological radiocarbon calibration curve in the historical era, and (3) the possible existence of carbon-14 in antediluvian fossil material. Suggestions are offered for experimental projects that would resolve these uncertainties. In this paper I will discuss eight categories of carbon-14 models and their experimental implications. Six, or three-quarters of these, are creationist models. The purpose of this paper is to stimulate thinking and to argue for an experimental perspective. CONSTRAINTS Any model of carbon-14 dating must satisfy certain constraints. First, since carbon-14 dating is objective and reproducible, it cannot be ignored. One cannot simply dismiss it out of hand; there should be an explanatory model for the data. Second, it has been validated at least back to 300 B.C. by comparison with many other reliable dating methods.

7. Carbon-14 Dating - Hutchinson Encyclopedia Article About Carbon-14 Dating Hutchinson encyclopedia article about carbon14 dating. carbon-14 dating. Information about carbon-14 dating in the Hutchinson encyclopedia. http://encyclopedia.farlex.com/carbon-14 dating

Domain='thefreedictionary.com' word='radiocarbon dating' Printer Friendly 759,303,446 visitors served. TheFreeDictionary Google Word / Article Starts with Ends with Text subscription: Dictionary/ thesaurus Medical dictionary Legal dictionary Financial dictionary Acronyms Idioms Encyclopedia Wikipedia encyclopedia Hutchinson encyclopedia radiocarbon dating (redirected from carbon-14 dating Also found in: Dictionary/thesaurus Wikipedia 0.06 sec. write_ads(AdsNum, 0) radiocarbon dating Method of dating organic materials (for example, bone or wood), used in archaeology. Plants take up carbon dioxide gas from the atmosphere and incorporate it into their tissues, and some of that carbon dioxide contains the radioactive isotope carbon-14 (see radiocarbon cycle ). As this decays at a known rate (half of it decays every 5,730 years), the time elapsed since the plant died can be measured in a laboratory. Animals take carbon-14 into their bodies from eating plant tissues and their remains can be similarly dated. After 120,000 years so little carbon-14 is left that no measure is possible (see half-life Radiocarbon dating was first developed in 1949 by the US chemist Willard Libby . The method yields reliable ages back to about 50,000 years, but its results require correction since Libby's assumption that the concentration of carbon-14 in the atmosphere was constant through time has subsequently been proved wrong. Discrepancies were noted between carbon-14 dates for Egyptian tomb artefacts and construction dates recorded in early local texts. Radiocarbon dates from tree rings (see

8. THE PROBLEMS WITH CARBON-14 DATING carbon14 dating is an inaccurate method due to its reliance on faulty assumptions. http://contenderministries.org/evolution/carbon14.php

Home Apologetics Apologetics False Religions ... CSS based JavaScript menu / DHTML Drop Down Menu by OpenCube Web Contender Ministries APOLOGETICS Christian Apologetics A Course in Miracles Bahai Buddhism ... Wicca Our Ads are automatically placed based on the content of the page in which they appear. We do not have the option of choosing which ads appear on the site. This can result in the appearance of Ads we do not endorse and with which we seriously disagree. We filter these ads as we find them, but this takes time. Your patience is appreciated. BIBLE PROPHECY A Beginning of Global Governance - #1 in a series Prophetic Signs that we are in the End Times The Earth Charter's Spiritual Agenda - #2 in a Series The New Age Influence at the United Nations - #3 in a Series ... Contact Us THE PROBLEMS WITH CARBON-14 DATING Carbon-14 dating is the standard method used by scientists to determine the age of certain fossilized remains. As scientists will often claim something to be millions or billions of years old (ages that do not conform to the Biblical account of the age of the earth), Christians are often left wondering about the accuracy of the carbon-14 method. The truth is, carbon-14 dating (or radiocarbon dating, as it’s also called) is not a precise dating method in many cases, due to faulty assumptions and other limitations on this method.

9. Carbon-14 Dating carbon14 dating is important in archeology. Archeologists use counts of the radioactive isotope C-14 to date organic remains such as wood, bone, http://lilt.ics.hawaii.edu/belvedere/materials/Mass-Extinctions/C14date.htm

Carbon-14 Dating Parent Daughter Half-Life Carbon-14 Nitrogen-14 5730 years Carbon-14 dating is important in archeology. Archeologists use counts of the radioactive isotope C-14 to date organic remains such as wood, bone, and charcoal. It's usable in the range of about 50,000 years to the present. Here's why it works: Living animals (and people!) absorb all the isotopes of carbon. They absorb the unstable isotope Carbon-14, as well as the stable isotopes C-13 and C-12. Carbon-14 decays into N-14 continuously. After an organism's death, C-14 continues to decay but no new C-14 is added. So measuring the amount of C-14 left tells you how long ago the organism lived and died. Since the half-life of C-14 is relatively short, ancient remains have very little C-14. Carbon-14 dating isn't so useful for geologists and paleontologists, because the objects they're interested in are usually much, much older than 50,000 years. Dating with other radioisotopes is very useful for geologists and paleontologists.

10. AlphaNOVA | Carbon-14 Dating Fact And Fiction Today many people believe carbon14 dating is solid, irrefutable evidence for long ages. Is this true? In carbon-14 dating Fact and Fiction, http://www.worldbydesign.org/alphanova/programs/c14dating.html

CRSEF Home Events Research Articles ... Purchase Program Carbon-14 Dating Fact and Fiction Today many people believe Carbon-14 dating is solid, irrefutable evidence for long ages. Is this true? In Carbon-14 Dating: Fact and Fiction, AlphaNOVA takes you behind the scenes of Carbon-14 dating to reveal the truth. It just may surprise you. Watch the Program Online RealMedia Windows Media RealMedia Windows Media RealMedia Windows Media RealMedia Windows Media Home About AlphaNOVA TV Schedule Programs ... Contact Us

11. Problems With Radiometric And Carbon-14 Dating Problems with Radiometric and carbon14 dating. Are the findings of evolution research and its chronology any better than those of the chronology of ancient http://www.specialtyinterests.net/carbon14.html

The Dating Game Helping fight evolution Problems with Radiometric and Carbon-14 Dating Are the findings of evolution research and its chronology any better than those of the chronology of ancient Egypt and its neighbors? Carbon-14 Dating Methods Radiocarbon dating is still a young science and even though there has been done a lot of research we must understand that each individual tends to accept those data which fit his expectations. What I am attempting to do now is point out some areas of cautions or possible pitfalls in relying too heavily on such dating methods. We all realize that parent radioactive material is transformed into stable daughter products, i.e. > C-14 -> C-13 and/or C-12 To illustrate: If we have 1 gram of C-14 decaying at a steady, previously determined rate, after about 5730 years there is according to its half-life only ½ gram of this C-14 left.[See BAR , May 1997, p. 17.] Radiometric dating and real time may be assumed to be equivalent only if the following criteria are met: For C-14 dating the conditions are: 1. The material to be dated must be organic

12. Carbon-14 Dating --  Britannica Online Encyclopedia Britannica online encyclopedia article on carbon14 dating method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14). http://www.britannica.com/eb/article-9020245/carbon-14-dating

var britAdCategory = "other"; Already a member? LOGIN Encyclopædia Britannica - the Online Encyclopedia Home Blog Advocacy Board ... Free Trial Britannica Online Content Related to this Topic This Article's Table of Contents carbon-14 dating Print this Table of Contents Linked Articles Carbon carbon cycle Willard F. Libby Shopping New! Britannica Book of the Year The Ultimate Review of 2007. 2007 Britannica Encyclopedia Set (32-Volume Set) Revised, updated, and still unrivaled. New! Britannica 2008 Ultimate DVD/CD-ROM The world's premier software reference source. carbon-14 dating Page 1 of 1 also called radiocarbon dating, method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14). Carbon -14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth's atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere. carbon-14 dating... (75 of 238 words) To read the full article, activate your FREE Trial Close Enable free complete viewings of Britannica premium articles when linked from your website or blog-post.

13. Move Over Carbon-14 Dating–Argonne Develops An Ultrasensitive Trace Analysis Te One of the first applications for ATTA may be dating ancient Greenland ice cores. While carbon14 dating has been used to date ice up to about 50000 years http://www.anl.gov/Media_Center/Frontiers/2002/b6excell.html

Click on image for larger view. The method uses six laser beams to slow, trap and count atoms. Click on image for larger view. Called Atom Trap Trace Analysis , or ATTA for short, the technology holds promise for advancing the state of the art in many fields, from groundwater studies to environmental monitoring. One of the first applications for ATTA may be dating ancient Greenland ice cores. While carbon-14 dating has been used to date ice up to about 50,000 years old, ages of older samples have to be inferred from circumstantial evidence, such as their depth. Trace analysis of krypton-81, which lasts 40 times longer than carbon-14, can be used to date samples up to 1 million years old. An Argonne team has counted individual atoms of krypton-85 and krypton-81 isotopes in a sample of natural krypton gas. Krypton-85 atoms have one more, and krypton-81 three fewer, neutrons than the common krypton-84 atoms. The two isotopes are extremely rare: in a natural sample of the gas, every krypton-81 atom is mixed in with a trillion krypton-84 atoms that are chemically similar. Until this development, ultrasensitive techniques capable of detecting trace isotopes at the parts-per-trillion level required either a particle accelerator or detectors that had to be shielded from cosmic rays and other "noise."

14. Carbon-14 Dating - Definition Of Carbon-14 Dating By The Free Online Dictionary, Definition of carbon14 dating in the Online Dictionary. Meaning of carbon-14 dating. What does carbon-14 dating mean? carbon-14 dating synonyms, carbon-14 http://www.thefreedictionary.com/carbon-14 dating

Domain='thefreedictionary.com' word='carbon-14 dating' Printer Friendly 759,303,630 visitors served. TheFreeDictionary Google Word / Article Starts with Ends with Text subscription: Dictionary/ thesaurus Medical dictionary Legal dictionary Financial dictionary Acronyms Idioms Encyclopedia Wikipedia encyclopedia Hutchinson encyclopedia carbon-14 dating Also found in: Wikipedia Hutchinson 0.15 sec. write_ads(AdsNum, 0) car·bon-14 dating (kär b n-fôr-t n , -f r-) n. See radiocarbon dating carbon-14 dating See radiocarbon dating Thesaurus Legend: Synonyms Related Words Antonyms Noun carbon-14 dating - a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years carbon dating radiocarbon dating dating geological dating - use of chemical analysis to estimate the age of geological specimens write_ads(AdsNum, 0) Page tools Printer friendly Cite / link Email Feedback Add definition Charity('US') Mentioned in References in periodicals archive carbon dating dating geological dating radiocarbon dating Inside the Scrolls" provides a unique illustrated catalog of the contents of all 11 caves, including detailed analysis of every major scroll, and considers the methods of interpretation employed, including carbon-14 dating , paleography, and computer reconstruction.

15. Carbon-14 Dating - Dead Sea Scrolls News Story - WSOC Charlotte Once the age of the scrolls was determined through carbon14 dating and paleography, questions about content still existed. To answer these questions, http://www.wsoctv.com/deadseascrolls/6045492/detail.html

GoCarolinas Just Pay 1/2 Events Movies ... WAXN 64 Related To Story SCIENCE OF THE DEAD SEA SCROLLS Carbon-14 Dating DNA Analysis Digitization Narrow-band Infrared Imaging (IR) ... Additional Resources And Web Links Carbon-14 Dating POSTED: 2:03 am EST January 13, 2006 UPDATED: 3:11 am EST January 13, 2006 What is Carbon-14? Carbon is element 6 on the periodic table. It has an atomic mass of 12 and is found in our atmosphere and in every living thing on Earth. Nitrogen is element 7 on the periodic table. It has an atomic mass of 14. Carbon and Nitrogen are both found in our atmosphere. When sunlight (radiation) hits Nitrogen atoms, it converts it into a radioactive isotope called Carbon-14. Carbon-14 functions (bonds) more like Carbon atoms than Nitrogen atoms. This means Carbon-14 can be bonded into CO (carbon dioxide) just like regular Carbon. Carbon-14 gets bound into CO in the atmosphere. It is not in all CO . The ratio of of Carbon-14 to Carbon-12 (regular carbon) remains stable at one (1) Carbon-14 atom for every 10 atoms of Carbon-12.

16. Carbon Dating Background carbon14 dating has been used successfully on the Dead Sea Scrolls, . Although the half-life of carbon-14 makes it unreliable for dating fossils over http://www.acad.carleton.edu/curricular/BIOL/classes/bio302/Pages/CarbonDatingBa

Carbon-14 Dating: Background Information Carbon dating is used to determine the age of biological artifacts up to 50,000 years old. This technique is widely used on recent artifacts, but teachers should note that this technique will not work on older fossils (like those of the dinosaurs which are over 65 million years old). This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers. Carbon-14 dating has been used successfully on the Dead Sea Scrolls, Minoan ruins and tombs of the pharohs among other things. What is Carbon-14? Carbon-14 is a radioactive isotope of carbon. Its has a half-life of about 5,730 years. The short half-life of carbon-14 means its cannot be used to date extremely old fossils. Levels of carbon-14 become difficult to measure and compare after about 50,000 years (between 8 and 9 half lives; where 1% of the original carbon-14 remains undecayed). How is Carbon-14 formed? Carbon-14 is created from nitrogen-14 in the upper atmosphere of the earth. Radiation from the sun collides with atoms in the atmosphere. These collisions create secondary cosmic rays in the form of energentic neutrons. When these neutrons collide with nitrogen-14 in the atmosphere carbon-14 can be created. Nitrogen normally occurs in a seven proton, seven nuetron, nitrogen-14 state. When it collides with an energetic neutron it becomes carbon-14, with six protons and eight neutrons and gives off a hydrogen atom with one proton and zero neutrons.

17. Lost City Expedition: Carbon 14 Dating If the sample contains carbon, and is not older than ~40000 years, it can be dated very accurately using a technique known as “carbon14 dating” or http://www.lostcity.washington.edu/science/instruments/shorebasedanalyses/howold

How Old Is Lost City?- Carbon 14 Dating The attached picture shows the accelerator (the huge brown tube) in the foreground, and the source in the background (inside the fence). The carbon ion beam moves toward the camera. Radiocarbon dating is based on measurements of the number of C atoms, a rare and special isotope of carbon. While most carbon atoms are the stable isotope C, meaning that they have six protons and six neutrons and are stable over time, C begins to radioactively decay at well-known and constant rate (half of the remaining carbon-14 disappears every 5700 years). Thus, if we can count the number of C atoms compared to the number of C atoms, we can use algebra to back calculate the age of the sample. Of course, the trick is actually counting the atoms; as only one out of every trillion, 1x1012, carbon atoms is a C atom, in some cases we must accurately count only 1000 atoms! Radiocarbon dating is only accurate for samples younger than about 40,000 years, why? One method to accurately count carbon-14 atoms is called accelerator mass spectrometry C and C) get directed towards different detectors. Furthermore, high energies are required for the detector that counts the carbon-14 atoms to work properly. Every sample requires a few hours of preparation, about 10 minutes for the instrument to measure, and $300+ in instrument costs.

18. WikiAnswers - How Does Radiocarbon Dating Or Carbon-14 Dating Work Are beyonce and j still dating? Describe How is carbon14 used to date materials? Example problems of carbon dating? How does carbon 14 dating tool work? http://wiki.answers.com/Q/How_does_radiocarbon_dating_or_carbon-14_dating_work

About Browse Advanced Search How to Contribute ... Most-recent questions For Example: How do you call a girl for a date? Is there a cure for migraines? ANSW.Init(10,""); Optional Login/ Register Username Password Remember me Why Register Lost Password? Optional Login /Register Username Password Retype Password E-mail Address Send me the monthly WikiAnswers newsletter with funky questions, helpful new features and announcements. Remember me Why Register Lost Password? Related Categories Chemistry Paleontology Advertisement How does radiocarbon dating or carbon-14 dating work? You asked for an easy explanation The original question asked for an easy way to explain it, so I'm going to try. Here goes . . . . All organic matter contains carbon, which is an element. But there are different types of carbon, called isotopes. The most common isotope is carbon-12 (or C), which (according the article) makes up 98.89 percent of the naturally occurring carbon. There's carbon-13, or C, which is much rarer, accounting for only 1.11 percent, and then there's carbon-14, or C, which makes up a ridiculously tiny fraction of existing carbon. (The periodic table of the elements also reflects the existence of isotopes by showing a weighted average for the atomic weight of each element, but I digress.) The first two isotopes

19. Suigetsu In 1998 I ran across an article on the internet talking about a Japanese lake which had calibrated carbon14 dating back to 43000 years ago. http://home.entouch.net/dmd/suigetsu.htm

The Pathway Papers are here Why Radiocarbon Dating WorksLake Suigetsu http://home.entouch.net/dmd/suigetsu.htm Free Hit Counter Visitors to these pages since 12-29-97 Related Pages: 600,000 years of not sweeping the floor-The Soils of Beijing Carbonate Hardgrounds Disprove Global Flood Time Sequence in Pebbles-Conglomerates in Conglomerates Time in the FloodSeismic and the Great Stone Dome ... Theology articles Why Radiocarbon dating worksLake Suigetsu In 1998 I ran across an article on the internet talking about a Japanese lake which had calibrated Carbon-14 dating back to 43,000 years ago. The article said Bottom of Lake Refines Carbon Dating Technique By Kenneth Chang ABCNEWS.com Feb. 23 - Each spring, tiny plants bloom in Lake Suigetsu, a small body of water in Japan. When these one?cell algae die, they drift down, shrouding the lake floor with a thin, white layer. The rest of the year, dark clay sediments settle on the bottom. The alternating layers of dark and light count the years like tree rings. That has allowed scientists to fine?tune a technique called carbon-14 dating, which is used to pin down dates for artifacts tens of thousands of years old. " http://more.abcnews.go.com/sections/science/dailynews/carbon0220.html

20. Uses Of Radiocarbon Dating As for still earlier periods, carbon14 dating excited scientists (including some climate scientists) largely because it might shed light on human evolution http://www.aip.org/history/climate/Radioc.htm

The Discovery of Global Warming Spencer Weart July 2004 [ HOME ] Table of Contents for printer Uses of Radiocarbon Dating Climate science required the invention and mastery of many difficult techniques. These had pitfalls, which could lead to controversy. An example of the ingenious technical work and hard-fought debates underlying the main story is the use of radioactive carbon-14 to assign dates to the distant past. For other examples, see the essays on Temperatures from Fossil Shells and Arakawa's Computation Device. The prodigious - LINKS - More discussion at Government External input Revelle's result It was especially fascinating to discover that our particular species of humans arose something like 100,000 years ago, no doubt deeply influenced by the ice ages. A few scientists noticed that the techniques might also be helpful for the study of climate itself. From its Ways were found to use carbon dioxide instead. Frustrating uncertainties prevailed until workers understood that their results had to be adjusted for the room's temperature and even the barometric pressure.

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