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Topic: Radiocarbon

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	c. Radiocarbon. 2001. The Encyclopedia of World History
		Developed by Willard F. Libby of the University of Chicago, radiocarbon dating is based on the fact that carbon isotope carbon-14 enters the carbon dioxide of the atmosphere with carbon-12, ordinary carbon (c).
		As soon as an organism dies, no further radiocarbon is incorporated into it and the carbon-14 left therein disintegrates at a known rate, only half remaining after 5,730 years.
		The C-14 atoms in radiocarbon samples taken from tiny samples of bone, charcoal, shell, wood, and other organic substances found in archaeological sites are counted by accelerator mass spectrometry, resulting in age determinations that are statistical approximations of the date of the sample.
	www.bartleby.com /67/6.html (261 words)

	Radiocarbon Dating
		Radiocarbon dating was the first chronometric technique widely available to archaeologists and was especially useful because it allowed researchers to directly date the panoply of organic remains often found in archaeological sites including artifacts made from bone, shell, wood, and other carbon based materials.
		Radiocarbon dating is especially good for determining the age of sites occupied within the last 26,000 years or so (but has the potential for sites over 50,000), can be used on carbon-based materials (organic or inorganic), and can be accurate to within ±30-50 years.
		Radiocarbon analyses are carried out at specialized laboratories around the world (see a list of labs at: http://www.radiocarbon.org/Info/index.html#labs).
	www.ncsu.edu /project/archae/enviro_radio/overview.html (741 words)

	The 1988 Shroud of Turin Radiocarbon Tests Reconsidered
		In practice, radiocarbon dates are always accompanied by confidence intervals that are mathematical expressions of the range of statistical certainty for the date itself.
		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.
		It should be noted that the head of one of the labs that originally conducted the radiocarbon tests on the Shroud subsamples agrees with the determination that the Oxford lab results were statistically significantly different from the others.
	members.aol.com /turin99/radiocarbon-a.htm (2438 words)

	Radiocarbon dating services. Commercial lab in Ukraine.
		C (or Radiocarbon) is the radioactive isotope of the common element carbon.
		The radiocarbon is oxidised to carbon dioxide (or CO) and is instantantly mixed throughout the atmosphere.
		Radiocarbon content in the earth atmosphere is varying in time due to past changes in the strength of the earth’s magnetic field, the strength of the sun and changes in the carbon cycle.
	users.ldc.net /~mbuz/c14.htm (723 words)

	Beta Analytic - World's Largest Radiocarbon Dating Service; AMS, Mass Spectrometry, C14, and more... (Site not responding. Last check: 2007-10-13)
		Radiocarbon age dating is best known for its applications in archaeology and quaternary geology.
		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.
		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 is a reasonably reliable method for dating objects between 300 and 30,000 years old.
		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)

	Radiocarbon dating Summary
		Radiocarbon dating is a technique for determining the age of very old objects consisting of organic (carbon-based) materials, such as wood, paper, cloth, and bone.
		Radiocarbon dating can be used for objects up to 30,000 years of age, but it is highly reliable only for objects less than 7,000 years old.
		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.
	www.bookrags.com /Radiocarbon_dating (3734 words)

	Radiocarbon dating - Wikipedia, the free encyclopedia
		The technique of radiocarbon dating was discovered by Willard Frank Libby and his colleagues in 1949 during his tenure as a professor at the University of Chicago.
		Radiocarbon labs generally report an uncertainty, e.g., 3000±30BP indicates a standard deviation of 30 radiocarbon years.
		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).
	en.wikipedia.org /wiki/Radiocarbon_dating (1768 words)

	Why Is Radiocarbon Dating Important To Archaeology?
		His radiocarbon dating technique is the most important development in absolute dating in archaeology and remains the main tool for dating the past 50,000 years.
		Radiocarbon is produced in the upper atmosphere after Nitrogen-14 isotopes have been impacted by cosmic radiation.
		Radiocarbon is then taken in by plants through photosynthesis, and these plants in turn are consumed by all the organisms on the planet.
	www.parks.ca.gov /?page_id=24000 (981 words)

	Radiocarbon Reservoir Age
		These coastal radiocarbon reservoir age data don't satisfy our need for the open ocean because of their limited geographic distribution and they are often influenced by organism diets, sediment pore waters or river mixing among other factors.
		Their radiocarbon reservoir age estimates are based on output from a three-dimensional global ocean circulation model described in Butzin et al., (2005).
		Radiocarbon simulations for the glacial ocean: the effects of wind stress, Southern Ocean sea ice and Heinrich events.
	radiocarbon.ldeo.columbia.edu /research/resage.htm (650 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 (3060 words)

	[No title]
		Radiocarbon dating was one peaceful by-product of accelerated wartime research into atomic physics and radioactivity in the 1940s.
		It has long been recognized that if the radiocarbon atoms could be detected directly, rather than by waiting for their decay, smaller samples could be used for dating and older dates could be measured.
		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.lycos.com /info/radiocarbon-dating--samples.html (679 words)

	K-12
		Radiocarbon dating enabled archaeologists and other scientists to verify the ages of carbon-bearing materials ndependently and almost overnight revolutionised the approach of dating the past.
		Radiocarbon dating is one of the critical discoveries in 20th century science and it provided one of the most important tools for archaeologists in their quest to uncover the past.
		Radiocarbon dating is limited to the period 0 - 60 000 years, because the 'half-life' of radiocarbon is about 5700 years, so to date rocks scientists must use other methods.
	www.c14dating.com /k12.html (2794 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.
		Thus the ratio of radiocarbon to stable carbon in living animal tissue is also virtually the same as the ratio of radiocarbon to stable carbon in the atmosphere at any given time.
		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)

	Southeast Alaska: Radiocarbon Dates
		Radiocarbon dating has provided an age framework for the fossils collected in the caves of Southeast Alaska.
		Radiocarbon dates on bone beyond 40,000-45,000 years BP are considered limitless dates (no measurable Carbon-14), so it is difficult to work out a chronology beyond 40,000 years ago.
		All radiocarbon dates obtained thus far from parts of Southeast Alaska other than Prince of Wales Island are postglacial in age.
	www.usd.edu /esci/alaska/dates.html (701 words)

	Has radiocarbon dating been invalidated by unreasonable results?
		In this example, old radiocarbon dates from living clams or snails are given as evidence which discredits the reliability of radiocarbon dating.
		This problem, known as the "reservoir effect", is not of very great practical importance for radiocarbon dating since most of the artifacts which are useful for radiocarbon dating purposes and are of interest to archaeology derive from terrestrial organisms which ultimately obtain their carbon atoms from the air, not the water.
		In actual practice, it is the amassed evidence of multiple radiocarbon dates, generally on different materials by different investigators using different measurement apparatus, which is applied to a given chronological question.
	www.biblicalchronologist.org /answers/c14_results.php (930 words)

	Radiocarbon Dating--Authentication of The Lost Gospel of Judas--National Geographic (Site not responding. Last check: 2007-10-13)
		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)

	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).
		There is no explanation, however, of how the ‘repaired’ threads used in the radiocarbon dating were woven into the old cloth so cunningly that the textile experts who selected the area for analysis failed to notice the substitution.
		In radiocarbon dating, whatever is being dated is incinerated until all that remains is carbon or carbon dioxide gas.
	www.innoval.com /C14 (4192 words)

	Radiocarbon Dating and Questions
		Libby’s discovery, now known as the carbon-14 (or radiocarbon) technique, was a method that could be used to determine the age of organic remains.
		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)

	SCIENTISTS SPEAK ABOUT RADIOCARBON DATING (Site not responding. Last check: 2007-10-13)
		Wood fragments from the gravel in which the remains were buried have a radiocarbon age of approximately 5,000 years.
		The bones would not have survived 6,000 solar years of exposure, nor could they be expected to remain in an articulate relationship during erosion and reburial by natural processes.
		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)

	Rafter Radiocarbon Laboratory: Measuring 14C
		For example, the radiocarbon age of a piece of wood gives the time since the wood was growing.
		Since in most cases the carbon is only one component of the material, radiocarbon dating using decay counting may require the consumption of many grams of the sample, and in some cases kilograms.
		Radiocarbon dating by AMS is now used by a number of museums and dealers in antiquities to authenticate the age of objects, such as wood carvings and textiles.
	www.gns.cri.nz /rafter/measure.htm (1461 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)

	Laboratorium Aparatury Specjalnej
		Most recently, he was interesting in past variations of radiocarbon concentration in the atmosphere, past variations in the carbon cycle, and reconstruction of climatic variations at the end of the late glacial.
		Radiocarbon chronology of the Late Glacial and Holocene sedimentation and water level changes in the Gościąż Lake basin and its surroundings.
		Radiocarbon calibration by means of varve versus 14C ages of terrestrial macrofossils from Lake Gościąż and Lake Perespilno, Poland.
	www.radiocarbon.pl /staff.htm (840 words)

	TEMPORAL VARIATIONS OF BOMB RADIOCARBON INVENTORY IN THE OCEAN
		Establish a data base for information with regard to evolution of geochemical tracers in the ocean for the purpose of constraining the architecture and circulation dynamics of the ocean general circulation models, especially when such models are used for estimating the uptake of fossil fuel CO by the ocean.
		If we do not separate the bomb-produced radiocarbon from the natural radiocarbon, it will be impossible to determine whether the disagreements between model and observation reflect the deficiencies in the model's simulation of the steady state distribution of natural radiocarbon or in its simulation of the distribution of the bomb radiocarbon transient.
		Hence, the separation of bomb produced radiocarbon from the natural radiocarbon in the overall radiocarbon measurements is essential if radiocarbon distribution is to be used to constrain the ocean models.
	www.aoml.noaa.gov /general/project/ocdthp2.html (683 words)

	Radiocarbon Dating by Dr. Elisabetta Boaretto
		The amount recovered from the letters was considered too small for the radiocarbon determination and more patina was scraped from the side and from the back of the tablet.
		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)

	Carbon-14 - Wikipedia, the free encyclopedia
		C, or radiocarbon, is a radioactive isotope of carbon discovered on February 27, 1940, by Martin Kamen and Sam Ruben.
		Its presence in organic materials is used extensively as basis of the radiocarbon dating method to date archaeological, geological, and hydrogeological samples.
		Carbon-14 is produced in the upper layers of the troposphere and the stratosphere by thermal neutrons absorbed by nitrogen atoms.
	en.wikipedia.org /wiki/Radiocarbon (356 words)

	Radiocarbon Dating
		The radiocarbon dates produced are fundamental to research into glacial history, rates of sea level change, and identification of earthquake and landslide frequencies in Canada.
		The GSC Radiocarbon Dating Laboratory was a National Facility that maintained an archive of radiocarbon information and GSC clientele were provided not only with an age, but with all pertinent field and laboratory data, including wood identification, and macrofossil and fossil arthropod assessments.
		The GSC laboratory was unique amongst radiocarbon laboratories in that it guaranteed that all dates and sample information would be made available to the Quaternary community.
	gsc.nrcan.gc.ca /c14/index_e.php (472 words)

	C-14 Information and Labs
		University of Zurich Dep't of Geography Radiocarbon Laboratory
		Radiocarbon ages of samples formed in the ocean, such as shells, fish, marine mammals etc., are generally several hundred years older than their terrestrial counterparts.
		This regional difference from the average global marine reservoir correction is designated ΔR (Stuiver and Braziunas, 1993) As a first approximation, ΔR is assumed to be a constant for a given region and is calculated from the difference in 14C years of known age marine samples and the marine model age for that calendar age.
	www.radiocarbon.org /Info/index.html (1127 words)

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