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Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.
Carbon-14, C-14, 14C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic matter is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples. Carbon-14 was discovered on February 27, 1940, by Martin Kamen and Sam Ruben at the University of California Radiation Laboratory in Berkeley, California. Its existence had been suggested by Franz Kurie in 1934.
The mesopelagiczone, also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones. It is defined by light, and begins at the depth where only 1% of incident light reaches and ends where there is no light; the depths of this zone are between approximately 200 to 1,000 meters below the ocean surface.
The Great Serpent Mound is a 1,348-feet-long (411 m), three-feet-high prehistoric effigy mound located in Peebles, Ohio. It was built on what is known as the Serpent Mound crater plateau, running along the Ohio Brush Creek in Adams County, Ohio. The mound is the largest serpent effigy known in the world.
Before Present (BP) or "years before present (YBP)" is a time scale used mainly in archaeology, geology, and other scientific disciplines to specify when events occurred relative to the origin of practical radiocarbon dating in the 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale, with 1950 being labelled as the "standard year". The abbreviation "BP" has been interpreted retrospectively as "Before Physics", which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, which scientists must account for.
Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy. Absolute dating provides a numerical age or range, in contrast with relative dating, which places events in order without any measure of the age between events.
The Buhl Woman was an Paleoindian Indigenous American woman whose remains were found in a quarry near Buhl, Idaho, United States, in January 1989. The remains are thought to have been deliberately buried. Radiocarbon dating has placed the age of the skeleton at 12,740–12,420 calibrated years before present, making her remains some of the oldest in the Americas, though the quality of the dating has been questioned.
The Suess effect is a change in the ratio of the atmospheric concentrations of heavy isotopes of carbon (13C and 14C) by the admixture of large amounts of fossil-fuel derived CO2, which contains no 14CO2 and is depleted in 13CO2 relative to CO2 in the atmosphere and carbon in the upper ocean and the terrestrial biosphere. It was discovered by and is named for the Austrian chemist Hans Suess, who noted the influence of this effect on the accuracy of radiocarbon dating. More recently, the Suess effect has been used in studies of climate change. The term originally referred only to dilution of atmospheric 14CO2 relative to 12CO2. The concept was later extended to dilution of 13CO2 and to other reservoirs of carbon such as the oceans and soils, again relative to 12C.
The Shroud of Turin, a linen cloth that tradition associates with the crucifixion and burial of Jesus, has undergone numerous scientific tests, the most notable of which is radiocarbon dating, in an attempt to determine the relic's authenticity. In 1988, scientists at three separate laboratories dated samples from the Shroud to a range of 1260–1390 CE, which coincides with the first certain appearance of the shroud in the 1350s and is much later than the burial of Jesus in 30 or 33 CE. Aspects of the 1988 test continue to be debated. Despite some technical concerns that have been raised about radiocarbon dating of the Shroud, no radiocarbon-dating expert has asserted that the dating is substantially unreliable. In 2019, an editor of Nature stated that "Nothing published so far on the shroud [...] offers compelling reason to think that the 1989 study was substantially wrong – but apparently it was not definitive either".
L'Anse aux Meadows is an archaeological site, first excavated in the 1960s, of a Norse settlement dating to approximately 1,000 years ago. The site is located on the northernmost tip of the island of Newfoundland in the Canadian province of Newfoundland and Labrador near St. Anthony.
Carbon dating the Dead Sea Scrolls refers to a series of radiocarbon dating tests performed on the Dead Sea Scrolls, first by the AMS lab of the Zurich Institute of Technology in 1991 and then by the AMS Facility at the University of Arizona in Tucson in 1994–95. There was also a historical test of a piece of linen performed in 1946 by Willard Libby, the inventor of the dating method.
Repton Abbey was an Anglo-Saxon Benedictine abbey in Derbyshire, England. Founded in the 7th century, the abbey was a double monastery, a community of both monks and nuns. The abbey is noted for its connections to various saints and Mercian royalty; two of the thirty-seven Mercian Kings were buried within the abbey's crypt. The abbey was abandoned in 873, when Repton was overrun by the invading Great Heathen Army.
St Wystan's Church is a Church of England parish church in Repton, Derbyshire, that is famous for its Anglo-Saxon crypt which is the burial place of two Mercian kings. The church is recorded in the National Heritage List for England as a Grade I listed building, and is dedicated to the Anglo-Saxon Saint Wystan, who was formerly buried within the church's crypt.
Samples used for radiocarbon dating must be handled carefully to avoid contamination. Not all material can be dated by this method; only samples containing organic matter can be tested: the date found will be the date of death of the plants or animals from which the sample originally came.
Radiocarbon dating measurements produce ages in "radiocarbon years", which must be converted to calendar ages by a process called calibration. Calibration is needed because the atmospheric 14
C/12
C ratio, which is a key element in calculating radiocarbon ages, has not been constant historically.
The variation in the 14
C/12
C ratio in different parts of the carbon exchange reservoir means that a straightforward calculation of the age of a sample based on the amount of 14
C it contains will often give an incorrect result. There are several other possible sources of error that need to be considered. The errors are of four general types:
The bomb pulse is the sudden increase of carbon-14 (14C) in the Earth's atmosphere due to the hundreds of above-ground nuclear bombs tests that started in 1945 and intensified after 1950 until 1963, when the Limited Test Ban Treaty was signed by the United States, the Soviet Union and the United Kingdom. These hundreds of blasts were followed by a doubling of the relative concentration of 14C in the atmosphere.
This page is a glossary of archaeology, the study of the human past from material remains.
The Fisher Mound Group is a group of burial mounds with an associated village site located on the DesPlaines River near its convergence with the Kankakee River where they combine to form the Illinois River, in Will County, Illinois, about 60 miles southwest of Chicago. It is a multi-component stratified site representing several Prehistoric Upper Mississippian occupations as well as minor Late Woodland and Early Historic components.
Isotope analysis has many applications in archaeology, from dating sites and artefacts, determination of past diets and migration patterns and for environmental reconstruction.
References
- 1 2 University of Bristol (February 2, 2018). "Radiocarbon dating reveals mass grave did date to the Viking age". Eurekalert. Retrieved February 4, 2018.
- 1 2 Philippa Ascough; Gordon Cook; Andrew Dugmore (December 1, 2005). "Methodological approaches to determining the marine radiocarbon reservoir effect" (PDF). Progress in Physical Geography: Earth and Environment. 29 (4): 532–547. Bibcode:2005PrPG...29..532A. doi:10.1191/0309133305pp461ra. S2CID 13472555.
- ↑ "Marine Reservoir Effect, Corrections to Radiocarbon Dates". Carbon Dating Service, AMS Miami - Beta Analytic. 2015-04-16. Retrieved 2022-02-19.
- ↑ Neils Ebdrup (14 March 2013). "Fish corrupt Carbon-14 dating". Science Nordic. Retrieved 27 November 2020.
- ↑ Catrine L. Jarman; Martin Biddle; Tom Higham; Christopher Bronk Ramsey (February 2, 2018). "The Viking Great Army in England: new dates from the Repton charnel" (PDF). Antiquity. 92 (361): 183–199. doi: 10.15184/aqy.2017.196 . Retrieved February 2, 2018.
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