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Topic: Radiocarbon year

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	Articles / Impact / Myths Regarding Radiocarbon Dating - Institute for Creation Research
		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.
		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).
	www.icr.org /index.php?module=articles&action=view&ID=293 (1798 words)

	Radiocarbon year
		Raw radiocarbon measurements are usually reported as years "before present" (BP).
		This is the number of radiocarbon years before 1950, based on the assumption that the level of carbon-14 in the atmosphere has always been at the 1950 level.
		Because this is untrue in practice, radiocarbon years do not correspond exactly to calendar years.
	www.ebroadcast.com.au /lookup/encyclopedia/ra/Radiocarbon_year.html (54 words)

	Radiocarbon Dating
		Radiocarbon, or Carbon-14, dating is probably one of the most widely used and best known absolute dating methods.
		The practical upper limit is about 50,000 years, because so little C-14 remains after almost 9 half-lives that it may be hard to detect and obtain an accurate reading, regardless of the size of the sample.
		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.
	archserve.id.ucsb.edu /Anth3/Courseware/Chronology/08_Radiocarbon_Dating.html (853 words)

	GNS Science Limited
		This is accomplished by comparing the measured CRA with a table of radiocarbon ages measured on samples of wood whose chronological ages are known exactly by tree-ring counting.
		Radiocarbon ages are inferred from the measurements subject to a number of assumptions and qualifications.
		Radiocarbon has a half life of 5730 ± 40 years (Godwin, 1962) and is formed in the atmosphere as a result of cosmic ray collisions with air molecules.
	www.rafterradiocarbon.co.nz /glossary.htm (2620 words)

	Omnipelagos.com ~ article "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 about 60,000 years.
		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.
	www.omnipelagos.com /entry?n=radiocarbon_year (1687 words)

	Memphis Archaeological and Geological SocietyArchaeologyMatching Radiocarbon Dates to Calendar Dates (Site not responding. Last check: 2007-10-10)
		But one radiocarbon year is not the same as one calendar year.
		To match radiocarbon years to calendar years, researchers have turned to independent timescales based on tree rings, ice cores and uranium-thorium dating.
		A report in early 2000 described a 13,000-year-old skeleton found in California and compared it to 12,500-year-old Monte Verde, without mentioning that the former date was in calendar years and the latter, radiocarbon years.
	www.memphisgeology.org /a_radiocarbon.html (400 words)

	C-14 (C14) analysis. Radiocarbon dating services: price and cost. (Site not responding. Last check: 2007-10-10)
		The radiocarbon is oxidised to carbon dioxide (or CO) and is instantantly mixed throughout the atmosphere.
		At radiocarbon dating laboratory could be measured the amount of remaining radiocarbon relative to the stable one which don’t change in concentration.
		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/c14cost.htm (385 words)

	Radiocarbon year -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-10)
		This is the number of radiocarbon years before 1950, based on the assumption that the level of (Click link for more info and facts about carbon-14) carbon-14 in the (The envelope of gases surrounding any celestial body) atmosphere has always been at the 1950 level.
		Because this is untrue in practice, radiocarbon years do not correspond exactly to calendar years.
		See (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) radiocarbon dating for more information.
	www.absoluteastronomy.com /encyclopedia/r/ra/radiocarbon_year.htm (128 words)

	Are tree-ring chronologies reliable?
		Because radiocarbon is everywhere the same in the atmosphere at any given time, tree rings which grew in the same year should have the same amount of radiocarbon.
		Furthermore, radiocarbon in the atmosphere fluctuates from year to year in a somewhat erratic fashion.
		Second, radiocarbon dates on objects of known age have confirmed the reliability of radiocarbon dating, and hence dendrochronology, when applied to the last 2,000 years, at least.
	www.biblicalchronologist.org /answers/c14_treerings.php (1474 words)

	NPS Archeology Program: The Earliest Americans
		Radiocarbon dating has revolutionized archeology, but discrepancies can occur when calendar dates and radiocarbon dates are compared.
		Radiocarbon years are based on the rate at which the carbon 14 isotope decays.
		Radiocarbon dates are calibrated because there is progressively less agreement between them and calendar dates as we go back in time.
	www.cr.nps.gov /archeology/eam/dating.htm (317 words)

	Radiocarbon Calibration
		Of practical importance to a wide range of scientific disciplines is the radiocarbon calibration, which is used for converting radiocarbon ages to calendar years; essential for measuring time and rates of change for numerous scientific fields.
		The tree ring atmospheric radiocarbon calibration data set spanning 0 to 12,410 years BP is superior to all other atmospheric radiocarbon calibration data due to the number and quality of the radiocarbon measurements and the accuracy and precision of the tree dendrochronology (Stuiver et al., 1998; Reimer et al., 2004).
		From 14,000 to 26,000 years BP, 80% of the data in the IntCal04 were provided by our laboratory and we have subsequently doubled the amount of data in the 14,000 to 26,000 year BP time interval (Cao et al., 2006; Fairbanks et al., 2005; 2006).
	radiocarbon.ldeo.columbia.edu /research/radiocarbon.htm (1950 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		It was soon apparent that the meaning of BP would change every year and that one would need to know the date of the analysis in order to understand the age of the sample.
		Thus, BP means years before A.D. Some people continue to express radiocarbon dates in relation to the calendar by subtracting 1950 from the reported age.
		To express a radiocarbon date in calendar years it must be normalized, corrected as needed for reservoir effects, and calibrated.
	www.canadianarchaeology.ca /radiocarbon/card/bp.htm (139 words)

	[No title]
		If the ratio of carbon-14 to carbon-12 doubled and we did not know it, radiocarbon ages of things living then would appear to us to be one half-life (or 5730 years) older than their true ages.
		Radiocarbon ages do not increase steadily as we go down into layers of old (but postflood) organic matter, as one might expect.
		A radiocarbon year would also not equal a calendar year if, for example, the half-life of carbon-14 has changed, if carbon-12 or carbon-14 was added to, or leached from, the specimen being dated, or if the global rates of formation or decay of carbon-14 differed.
	www.hope-of-israel.org /radiocar.htm (1564 words)

	Brown, R. H. --- Can Tree Rings Be Used to Calibrate Radiocarbon Dates?
		Scientists correct the raw data from radiocarbon dating determinations so as to give what they consider to be a more accurate real-time age.
		In order to determine what real-time age should be associated with a radiocarbon age, the radiocarbon data are often compared to historical and tree-ring data that are considered to be more reliable indicators of time.
		Radiocarbon corrections beyond that are often based on attempts to match the thickness variations of tree rings in old wood samples.
	www.grisda.org /origins/22047.htm (1847 words)

	Radiocarbon Date calculation
		The radiocarbon age of a sample is obtained by measurement of the residual radioactivity.
		Thus 1950, is year 0 BP by convention in radiocarbon dating and is deemed to be the 'present'.
		A radiocarbon measurement, termed a conventional radiocarbon age (or CRA) is obtained using a set of parameters outlined by Stuiver and Polach (1977), in the journal Radiocarbon.
	www.c14dating.com /agecalc.html (1984 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)

	Interview with Paul Damon
		Damon: One of the basic assumptions of radiocarbon dating was that the concentration of radiocarbon in atmospheric carbon dioxide had been constant in the past (see review by Damon, 1987 and Damon et al., 1978 for discussion and references).
		Suess (1955) first demonstrated a decrease in atmospheric radiocarbon concentration resulting from the combustion of fossil fuels and by 1957 it became apparent that the atmospheric 14C concentration was increasing as the result of atomic bomb tests (Rafter and Fergusson, 1957).
		In that year the annual production rate increased to 4.5 14C atoms/cm2esec and fell to 2.2 14C atoms/cm2esec during 1957 and 1958 and increased to 2.4 14C atoms/cm2esec during the year of the deVries publication, 1959 (Lingenfelter and Ramaty, 1970).
	www.agu.org /history/sv/proxies/damon_interview.html (2115 words)

	Radiocarbon Dating Dinosaurs? \| CRSEF Research (Site not responding. Last check: 2007-10-10)
		Radiocarbon dating is not possible beyond 50,000 years, yet these dates were within that limit.
		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)

	Radiocarbon Dating by Dr. Elisabetta Boaretto
		C age in year BP (Before Present) is calculated and calibrated to historical years.
		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)

	The Testimony of Radiocarbon Dating
		In one and the same year the University of Pennsylvania tested wood from a royal tomb in Gordion, capital of the short-lived Phrygian Kingdom in Asia Minor, and from the palace of Nestor in Pylos, in S.W. Greece.
		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.
		The other way of using radiocarbon dating to test the correctness of the reconstruction of ancient history is in testing organic material from a period removed by several centuries from the last cosmic catastrophe.
	www.varchive.org /ce/tc14.htm (4725 words)

	In the Beginning: Compelling Evidence for Creation and the Flood - How Accurate Is Radiocarbon Dating?
		Radiocarbon dating requires knowing the ratio of carbon-14 to carbon-12 in the atmosphere when the organic matter being dated was part of a living organism.
		If the atmosphere’s ratio of carbon-14 to carbon-12 has doubled since the flood and we did not know it, radiocarbon ages of things that lived soon after the flood would appear to be one half-life (or 5,730 years) older than their true ages.
		Ages around 40,000 radiocarbon years, which are typical of coal, have much younger true dates—near the time of the flood, roughly 5,000 years ago.
	www.creationscience.com /onlinebook/FAQ2.html (1642 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)

	NPS Archeology Program: Kennewick Man
		A hard-copy is enclosed showing the radiocarbon year/calendar year correlation curve segment associated with the radiocarbon date, along with explanation sheets.
		It is important to quote the original Conventional Radiocarbon Age, 13C/12C ratio and the calibration references in your publications for future reference by other researchers.
		When comparing the statistical agreement between radiocarbon dates, it is best to compare Conventional Radiocarbon Ages, as the calibration results may vary depending on the calculation format and time of calibration (ie calibration tables have changed through the years).
	www.cr.nps.gov /archeology/kennewick/hood1.htm (1123 words)

	In the Beginning: Compelling Evidence for Creation and the Flood - References and Notes
		A radiocarbon year would also not equal a calendar year if, for example, the half-life of carbon-14 has changed, if carbon-12 or carbon-14 was added to or leached from the specimen being dated, or if the formation rate of carbon-14 in the upper atmosphere changed.
		Radiocarbon ages of seeds in ancient caves often span unreasonably long time periods, such as 2,000 years.
		A year before, a worker in this laboratory told a mutual friend that circular reasoning was used in tree-ring chronologies.
	www.creationscience.com /onlinebook/FAQ22.html (1137 words)

	"PP43C-07" in fm06
		Here, we present a surface water radiocarbon reservoir age record of the high latitude western North Atlantic for the deglacial period via the use of fossil cold- water corals, and combine these results with published coexisting marine and terrestrial dated deposits, and Vedde ash radiocarbon dates.
		We are not able to resolve the timing of the transition in increased reservoir age from the mid-Allerod to the YD due to relatively small change and correspondingly large uncertainty in the estimates.
		C record derived from our atmospheric radiocarbon record displays a 40 per mil increase from 12800 to 12700 cal year BP, coincident with the high reservoir age in the early YD cold event.
	www.agu.org /cgi-bin/wais?hh=PP43C-07 (371 words)

	CD011.3: C-14 dates of living snails
		Living snails were carbon-14 dated at 2,300 and 27,000 years old, showing that the dating method is invalid.
		The source of the 2,300-year-old radiocarbon date (Keith and Anderson 1963, discussed by Strahler 1987, 156-157), has been abused and misused to discredit radiocarbon dating.
		In other words, the apparent age of 27,000 years for these snail shells is another example of the reservoir effect.
	www.talkorigins.org /indexcc/CD/CD011_3.html (487 words)

	Ramp Radiocarbon Dating
		The interpretation of radiocarbon dates is not simple, and an archaeologist must obtain an elementary knowledge of aspects of geochemistry to avoid pitfalls.
		Once the radiocarbon date has been corrected, it is then calibrated; that is, it is converted from "radiocarbon" years to "calendar" (or conventional) years.
		This is because the amount of Carbon-14 in the atmosphere and available to living organisms has not been constant, and as a consequence a radiocarbon year has been longer than a calendar year for most of the last 10,000 years.
	www.anth.ucsb.edu /faculty/glassow/RAMP/ramp_rc.date.html (1456 words)

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