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Topic: Radiocarbon dating


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In the News (Thu 21 Mar 19)

  
  Radiocarbon Dating (via CobWeb/3.1 planetlab1.netlab.uky.edu)   (Site not responding. Last check: 2007-11-03)
Finally, although radiocarbon dating is the most common and widely used chronometric technique in archaeology today, it is not infallible.
That is the true benefit of radiocarbon dating, that it can be employed anywhere in the world, and does have a 50,000 year range.
Using radiocarbon dating, archaeologists during the past 30 years have been able to obtain a much needed global perspective on the timing of major prehistoric events such as the development of agriculture in various parts of the world.
id-archserve.ucsb.edu.cob-web.org:8888 /Anth3/Courseware/Chronology/08_Radiocarbon_Dating.html   (853 words)

  
 Britain.tv Wikipedia - 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.
This is the number of radiocarbon years before 1950, based on a nominal (and assumed constant - see "calibration"?title=below) level of carbon-14 in the atmosphere equal to the 1950 level.
Standard calibration curves are available, based on comparison of radiocarbon dates of samples that can be independently dated by other methods such as examination of tree growth rings (dendrochronology), ice cores, deep ocean sediment cores, lake sediment varves, coral samples, and speleothems (cave deposits).
www.britain.tv /wikipedia.php?title=Radiocarbon_dating   (1726 words)

  
 The 1988 Shroud of Turin Radiocarbon Tests Reconsidered   (Site not responding. Last check: 2007-11-03)
In practice, radiocarbon dates are always accompanied by confidence intervals that are mathematical expressions of the range of statistical certainty for the date itself.
The radiocarbon date measurements themselves, as reported in Nature on Table 1, were evaluated utilizing the same series of statistical tests as were employed to evaluate the error terms.
By this measure, the radiocarbon dates incorporating the quoted error as part of the measurement, shows a statistically significant likelihood, at the 97% confidence level, that the sample date measurements from the three labs are actually different and should not be combined into one date.
members.aol.com /turin99/radiocarbon-a.htm   (2438 words)

  
 Beta Analytic - World's Largest Radiocarbon Dating Service; AMS, Mass Spectrometry, C14, and more...   (Site not responding. Last check: 2007-11-03)
Whereas other dating methods involve assumptions based on indeterminate factors, radiocarbon dating only requires the direct measurement of the natural radiocarbon content of the sample and that of an associated reference standard; both of which are quantifiable.
Radiocarbon dating of the water provides a mechanism to monitor, understand and control exploitation of the aquifer.
Since radiocarbon dates are easily understood, communication between the hydrologist and the layman is greatly enhanced.
www.radiocarbon.com /groundwater.htm   (932 words)

  
 BBC - h2g2 - Radiocarbon Dating
As radiocarbon dating allowed chronologies to be established relatively easily, archaeologists started to spend their time developing theories about the culture and society of early people.
Radiocarbon dating was quickly established as an invaluable tool to researchers studying the Quaternary period.
Radiocarbon dating is now over 50 years old, yet it remains the single most useful dating technique available to archaeologists and it still produces fascinating and sometimes startling results.
www.bbc.co.uk /dna/h2g2/A637418   (1553 words)

  
 CEN - Radiocarbon Dating Laboratory
Radiocarbon dating is based on the continuous decay of the radioactive isotope of carbon, C-14.
Radiocarbon is incorporated into all living organisms in proportion to its concentration in the environment.
Conventional radiocarbon dating is largely used at the CEN, however, samples containing small quantities of organic material are common.
www.cen.ulaval.ca /english/labradio.html   (371 words)

  
 Dating Exhibit
Radiocarbon determinations can be obtained on wood; charcoal; marine and fresh-water shell; bone and antler; peat and organic-bearing sediments, carbonate deposits such as tufa, caliche, and marl; and dissolved carbon dioxide and carbonates in ocean, lake and ground-water sources.
In addition, the half-life of radiocarbon must be known with sufficient accuracy, and it must be possible to measure natural levels of radiocarbon to appropriate levels of accuracy and precision.
To measure the age (that is, the abundance of radiocarbon), the sample can be placed into a mass spectrometer and that atom counted, or the sample can be placed into a Geiger counter and counted, requiring a wait on the average of 8000 years (the mean life of radiocarbon) for the decay.
www.mnsu.edu /emuseum/archaeology/dating/radio_carbon.html   (700 words)

  
 The Testimony of Radiocarbon Dating
The perplexing Egyptian dates were discussed at the conference of the workers in radiocarbon that took place in Cambridge July 1962, and two laboratories, of Groeningen in Holland and of the University of Pennsylvania, were entrusted with the task of clarifying the issue.
C 14 dating was being discussed at a symposium on the prehistory of the Nile Valley.
Libby, in his Radiocarbon Dating, stressed that the method is good only on the condition that the influx of cosmic rays has not changed during the last 25 or 30 thousand years, and also that the quantity of water in the oceans has not changed in the same period of time.
www.varchive.org /ce/tc14.htm   (4725 words)

  
 Carbon Dating
Carbon dating is a variety of radioactive dating which is applicable only to matter which was once living and presumed to be in equilibrium with the atmosphere, taking in carbon dioxide from the air for photosynthesis.
Carbon dating of ancient bristlecone pine trees of ages around 6000 years have provided general corroboration of carbon dating and have provided some corrections to the data.
From the dating of ancient bristlecone pine trees from the western U.S., a correction curve for the carbon dating over the range back to 5000 BC has been developed.
hyperphysics.phy-astr.gsu.edu /hbase/nuclear/cardat.html   (691 words)

  
 Radiocarbon Dating Dinosaurs? | CRSEF Research   (Site not responding. Last check: 2007-11-03)
There are no magical dating machines generate a report which reads 70 million year old; rather most dating of fossils is done by dating nearby lava flows or other igneous or metamorphic rock assumed to have lost all daughter products and been "set" at the time of the dinosaur or other fossil formation.
Because the AMS appears to be the choice of radiocarbon dating experts today and, because the AMS is assigned very low +/-deviations we tend to believe the lower dates as true values for the radiocarbon dating process.
Although there is little or no collagen in the bones as observed by radiocarbon dating labs the organic matter present in the bones are obviously biogenic in nature; that is: the source of the carbon is the dinosaur tissue and other organic matter buried with it.
www.worldbydesign.org /research/c14dating/datingdinosaurs.html   (1896 words)

  
 How does the radiocarbon dating method work?
Thus, the ratio of radiocarbon to stable carbon in a living plant is the same as the ratio of radiocarbon to stable carbon in the atmosphere at any given time.
Radiocarbon dating works by precisely measuring the ratio of radiocarbon to stable carbon in a sample.
This is necessary to remove errors in raw radiocarbon dates caused by fluctuations in the amount of radiocarbon in the atmosphere in the past.
www.biblicalchronologist.org /answers/c14_method.php   (706 words)

  
 Radiocarbon Dating Laboratory   (Site not responding. Last check: 2007-11-03)
C can be used in numerous applications, of which radiocarbon dating, with the possibility for dating back to about 50 000 years, is among the best-known and most practised applications.
During 1965-1998 Radiocarbon dating in Lund was performed in a conventional laboratory at the department of Quaternary Geology using two CO proportional counters for detecion of the
The dating capacity was ca 140 samples/year and around 4200 Radiocarbon datings were made during the lifetime of the laboratory.
www.geol.lu.se /personal/gns/ec14lab.htm   (643 words)

  
 Radiocarbon Dating--Authentication of The Lost Gospel of Judas--National Geographic   (Site not responding. Last check: 2007-11-03)
Radiocarbon, or C-14, testing establishes the age of codex to be nearly 1,700 years old.
Since its first use in the 1940s radiocarbon dating has been the most accurate method of dating ancient objects and artifacts.
Radiocarbon, present in living organisms, decays at a constant rate in dead tissue.
www.nationalgeographic.com /lostgospel/auth_dating.html   (218 words)

  
 SCIENTISTS SPEAK ABOUT RADIOCARBON DATING   (Site not responding. Last check: 2007-11-03)
Unfortunately, Radiocarbon Dating Lengthens Dates too Far into the Past - But only the scientific community is told that fact.
Wood fragments from the gravel in which the remains were buried have a radiocarbon age of approximately 5,000 years.
Radiocarbon in the atmosphere was markedly different prior to 1600 B.C. "It was found that the activity of radiocarbon in the atmosphere was going up and down even before the Industrial Revolution [when additional smoke began polluting the air]."—*H. deVries and *H.T. Waterbolk, "Groningen Radiocarbon Dates III," in Science, December 19, 1958, p.
www.pathlights.com /ce_encyclopedia/06dat5.htm   (1660 words)

  
 Radiocarbon Dating and Questions
Radiocarbon dating of an organism that lived in the vicinity of a volcano gives inaccurate results.
Consequently, the ages determined by the radiocarbon method are not taken seriously by archeologists because of the problems in the basic assumptions upon which the method was established.
Occasionally, the radiocarbon method is used to roughly determine whether an object is modern or of considerable antiquity; in essence, it is used as an authenticity test.
www.s8int.com /baddating2.html   (1641 words)

  
 Apologetics Press - Dating in Archaeology: Radiocarbon & Tree-Ring Dating
Perhaps the most critical assumption of radiocarbon dating is that the rates of carbon-14 production and decay are in a state of balance or equilibrium, and have been so for millions of years.
Modern radiocarbon dating assumes that the carbon-14/carbon-12 ratio in living organisms is the same now as it was in ancient organisms before they died.
Radiocarbon dating assumes that the carbon-12/carbon-14 ratio has stayed the same for at least the last hundred thousand years or so.
www.apologeticspress.org /articles/2019   (3070 words)

  
 Radiocarbon Dating - It's Limitations and Usefulness
Radiocarbon dating compares the amount of normal carbon with the amount of radioactive carbon in a sample.
Radiocarbon Dating is useful to compare the relative ages of equivalent samples where it is likely the samples have all been exposed to similar environmental conditions.
In long-term dating, isotopes of heavy metals such as uranium are usually involved, with decay half lives normally being in the millions of years.
www.chcpublications.net /radcarbn.htm   (4120 words)

  
 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.
The raw BP date cannot be used directly as a calendar date, because the assumption that the level of
Standard calibration curves are available, based on comparison of radiocarbon dates with other methods such as examination of tree growth rings (dendrochronology), ice cores, deep ocean sediment cores, lake sediment varves, coral samples, and speleothems (cave deposits).
www.mrsci.com /Radiobiology/Radiocarbon_dating.php   (1597 words)

  
 Beta Analytic - World's Largest Radiocarbon Dating Service; AMS, Mass Spectrometry, C14, and more...   (Site not responding. Last check: 2007-11-03)
The AMS technique for radiocarbon dating accounts for a substantial number of the analysis requests we receive each day.
There can be considerable advantages to using the AMS technique in many dating applications, making possible the extension of radiocarbon dating into many new areas of research.
More researchers are using a mix of both AMS and Radiometric dating in order to properlyanswer the complex questions posed by their research.
www.radiocarbon.com /international.htm   (823 words)

  
 Land Use History of the Colorado Plateau-Radiocarbon Dating
Radiocarbon (also called 14C) dating was invented in the late 1940s by Walter Libby, who was awarded the 1960 Nobel Prize for his discovery.
AMS dating uses a particle accelerator to count the number of 14C atoms remaining, and can be successful with samples the size of the head of a pin.
Webb, R. and Betancourt, J. The spatial and temporal distribution of radiocarbon ages from packrat middens.
www.cpluhna.nau.edu /Tools/radiocarbon_dating.htm   (465 words)

  
 The Biggest Radiocarbon Dating Mistake Ever
The results of radiocarbon measurements at Arizona, Oxford and Zurich yield a calibrated calendar age range with at least 95% confidence for the linen of the Shroud of Turin of AD 1260 - 1390 (rounded down/up to nearest 10 yr).
In radiocarbon dating, whatever is being dated is incinerated until all that remains is carbon or carbon dioxide gas.
The sample used for the radiocarbon dating is chemically unlike the shroud.
www.innoval.com /C14   (4192 words)

  
 Radiocarbon Dating by Dr. Elisabetta Boaretto
The date obtained was 2250±40 year BP which calibrated (±2σ, 95% probability) corresponds to the interval 390-200 BC.
A general conclusion is that radiocarbon dating of the patina on the Jeohash tablet does not give a conclusive proof to the authenticity of the inscription.
In the case of the James Ossuary the task for radiocarbon would be to try to date the varnish or the patina on the Ossuary and inside the letters.
www.bibleinterp.com /articles/Boaretto_report.htm   (716 words)

  
 Radiocarbon dating - Wikipedia, the free encyclopedia
He has been called "the unsung hero of radiocarbon dating" (cf Willis).
Raw radiocarbon ages (i.e., those not calibrated) are usually reported in years "before present" (BP).
This is the number of radiocarbon years before 1950, based on a nominal (and assumed constant - see "calibration" below) level of carbon-14 in the atmosphere equal to the 1950 level.
en.wikipedia.org /wiki/Radiocarbon_dating   (1737 words)

  
 dating: Absolute Dating
Absolute dating can be achieved through the use of historical records and through the analysis of biological and geological patterns resulting from annual climatic variations, such as tree rings (dendrochronology) and varve analysis.
Fission track dating is based on the fact that when uranium-238 atoms fission within a solid medium such as a mineral or a glass, they expel charged particles that leave a trail of damage (known as fission tracks) preserved in the medium.
Thermoluminescence, used in dating archaeological material such as pottery, is based on the luminescence produced when a solid is heated; that is, electrons freed during radioactive decay and trapped in the crystal lattice are released by heating, resulting in luminescence.
www.factmonster.com /ce6/sci/A0857691.html   (1414 words)

  
 EARTH SCIENCE: ON RADIOCARBON DATING
In many circumstances, radiocarbon dates on a series of carefully chosen samples will allow considerable refinement of the derived calendar ages through constraints imposed by a priori information (such as stratigraphy) or by the pattern of the radiocarbon dates relative to calibration curve variations (an approach that is sometimes referred to as "wiggle-matching").
Libby and his co-workers tested their dating technique on wood and charcoal found in Egyptian graves, whose age was already well known to archaeologists from historical analysis, and on very old redwood trees that could be independently dated by counting tree rings.
Note #2: The accelerator mass spectrometry dating method makes use of smaller quantities of material than required for conventional radiocarbon dating and extends the radiocarbon dating range to beyond 50,000 years from the approximately 0 to 25,000 years for conventional radiocarbon dating.
scienceweek.com /2005/sc050218-2.htm   (1888 words)

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