14 c dating fiasco shroud turin Radiocarbon 14 dating of the Shroud of Turin
The Cita para medico de cabecera malaga (Turin Shroud), a Citas gandhi cloth that tradition associates with the crucifixion and burial of Consultar cita revista 2016, has undergone numerous scientific tests, the most notable of which is Encontrar pareja gay gratis, in an attempt to determine the Paginas para hacer amigos mexico's authenticity. In 1988, scientists at three separate laboratories dated samples from the Shroud to a range of AD 1260–1390, which coincides with the first certain appearance of the shroud in the 1350s and is much later than the burial of Jesus.Relazioni extraconiugali tra sposati Aspects of the 1988 test continue to be debated.Encontro de crisma sobre namoroSite de namoro na alemanhaSite de relacionamentos internacionais Despite some technical concerns that have been raised about radiocarbon dating of the Shroud,Free online dating mobileбесплатный сайт знакомств mail.ru most experts assert that it is reliable.знакомства артисайт знакомств b
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14 c dating fiasco shroud turin History[Dating and divorce statistics 2016 australia] Radiocarbon 14 dating of the Shroud of Turin - Wikipedia, the free
1978: the creation of S.Tu.R.P.[Dating card new york times article]
The idea of scientifically dating the shroud had first been proposed in the 1960s, but permission had been refused because the procedure at the time would have required the destruction of too much fabric (almost 0.05 sq m ≅ 0.538 sq ft). The development in the 1970s of new techniques for radio-carbon dating, which required much lower quantities of source material,Free dating website for people over 50 prompted the Catholic Church to found the Free professionals dating site in usa 2016 (S.Tu.R.P.), which involved about 30 scientists of various religious faiths, including non-Christians.
The S.Tu.R.P. group initially planned to conduct a range of different studies on the cloth, including radio-carbon dating.Free profile templates for online datingGirl 1rules dating my teenage daughter wikia A commission headed by chemist Harry one direction and caroline flack dating and physicist Hint to online dating message tips for guys consulted numerous laboratories which were able at the time (1982) to carbon-date small fabric samples. The six labs that showed interest in performing the procedure fell into two categories, according to the method they utilised:
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To obtain independent and replicable results, and to avoid conflict between the laboratories, it was decided to let all interested laboratories perform the tests at the same time.
The 1985 rift between S.Tu.R.P. and the candidate labs
In 1982, the S.Tu.R.P. group published the list of tests to be performed on the shroud; these aimed to identify how the image was impressed onto the cloth, to verify the relic's purported origin, and to identify better-suited conservation methods. However, a disagreement between the S.Tu.R.P. group and the candidate laboratories devolved into a P.R. rift: the S.Tu.R.P. group expected to perform the under its own aegis and after the other examinations had been completed, while the laboratories considered radio-carbon dating to be the priority test, which should be completed at the detriment of other tests, if necessary.
The "Turin protocol of 1986"
A meeting with ecclesiastic authorities took place on September 29, 1986 to determine the way forward. In the end, a compromise solution was reached with the so-called "Turin protocol", which stated that:
- carbon-dating would be the only test performed;
- original and control samples, indistinguishable from each other, would be provided ();
- the test would be performed concurrently by seven laboratories, under the joint supervision of the Pontifical Academy of Science, the archbishop of Turin, and the British Museum;
- both dating methods would be adopted;
- the sample offered to each laboratory would weight 28 mg, equivalent to 9 sq. cm. of cloth;
- the British Museum would manage the distribution of the samples;
- laboratories would not communicate with each other during the analysis, nor divulge the results of the tests to anyone but the three supervising authorities.
The Vatican subsequently decided to adopt a different protocol instead.
- On April 27, 1987 a Vatican spokesperson announced to the newspaper that the procedure would likely be performed by two or three laboratories at most;
- On October 10, cardinal officially announced to the seven laboratories that the proportional counter method would not be used because this method would require too much Shroud material (gram quantities rather than milligram quantities). Only three laboratories, namely Oxford, Tucson and Zürich, would be provided with Shroud samples to be tested.
- The sole supervising institution would be the British Museum, headed by Dr Michael Tite;
These deviations were heavily criticized.
The blind-test method was abandoned, because the distinctive three-to-one herringbone twill weave of the shroud could not be matched in the controls, and it was therefore still possible for a laboratory to identify the shroud sample. Shredding the samples would not solve the problem, while making it much more difficult and wasteful to clean the samples properly. Professor Harry Gove, director of Rochester's laboratory (one of the four not selected by the Vatican), argued in an open letter published in that discarding the blind-test method would expose the results - whatever they may be - to suspicion of unreliability. However, in a 1990 paper Gove conceded that the "arguments often raised, … that radiocarbon measurements on the shroud should be performed blind seem to the author to be lacking in merit … lack of blindness in the measurements is a rather insubstantial reason for disbelieving the result."
In the heated debate that followed, a Church's spokesperson declared that
(t)he Church must respond to the challenge of those who want it to stop the process, who would want us to show that the Church fears the science.
We are faced with actual blackmail: unless we accept the conditions imposed by the laboratories, they will start a marketing campaign of accusations against the Church, which they will portray as scared of the truth and enemy of science. [...]
The pressure on the ecclesiastic authorities to accept the Turin protocol have almost approached illegality.— Luigi Gonella
The final protocol
The proposed changes to the Turin protocol sparked another heated debate among scientists, and the sampling procedure was postponed.
On April 17, 1988, ten years after the S.Tu.R.P. project had been initiated, British Museum scientific director Michael Tite published in Nature the "final" protocol:
- the laboratories at Oxford, Zürich and Tucson would perform the test;
- they would each receive one sample weighing 40 mg., sampled from a single portion of weave;
- the laboratories would each receive two control samples, clearly distinguishable from the shroud sample;
- samples would be delivered to the laboratories' representatives in Turin;
- each test would be filmed;
- there would be no comparison of results (nor communication) between laboratories until the results be certified as definitive, univocal and complete;
- the proportional counter method would not be used because it required gram quantities rather than milligram quantities of shroud material.
Among the most obvious differences between the final version of the protocol and the previous ones stands the decision to sample from a single location on the cloth. This is significant because, should the chosen portion be in any way not representative of the remainder of the shroud, the results would only be applicable to that portion of the cloth.
A further, relevant difference was the deletion of the blind test, considered by some scholars as the very foundation of the scientific method. The blind-test method was abandoned because the distinctive three-to-one herringbone twill weave of the shroud could not be matched in the controls, and a laboratory could thus identify the shroud sample. Shredding the samples would not solve the problem, while making it much more difficult and wasteful to clean the samples properly.
14 c dating fiasco shroud turin Account of the testing process Radiocarbon 14 dating of the Shroud of Turin - Wikipedia, the free
Sampling (April 1988)
Samples were taken on April 21, 1988 in the by , an expert on weaves and fabrics, and by Giovanni Riggi, a representative of the maker of bio-equipment "Numana". Testore performed the weighting operations, while Riggi made the actual cut. Also present were Cardinal Ballestrero, four priests, archdiocese spokesperson Luigi Gonella, photographers, a camera operator, Michael Tite of the British Museum and the labs' representatives.
As a precautionary measure, a piece twice as big as the one required by the protocol was cut from the Shroud; it measured 81 mm × 21 mm (3.19 in × 0.83 in). A strip showing coloured filaments of uncertain origin was discarded. The remaining sample, measuring 81 mm × 16 mm (3.19 in × 0.63 in) and weighing 300 mg, was first divided in two equal parts, one of which was preserved in a sealed container, in the custody of the Vatican, in case of future need. The other half was cut into three segments, and packaged for the labs in a separate room by Dr Tite and the archbishop. The lab representatives were not present at this packaging process, in accordance with the protocol.
The labs were also each given three control samples (one more than originally intended), that were:
- a fragment of weave coming from an Egyptian burial, discovered in 1964 and already carbon-dated to 1100 A.D.;
- a piece of mummy bandage carbon-dated to 200 A.D.;
- a sample of the cloak having belonged to and preserved in , , France, which had a verifiable provenance and was woven between 1240 and 1270.
Tucson performed the tests in May, Zürich in June, and Oxford in August, and communicated their results to the British Museum.
On September 28, 1988, British Museum director and coordinator of the study Michael Tite communicated the official results to the Diocese of Turin and to the .
In a well-attended press conference on October 13, Cardinal Ballestrero announced the official results, i.e. that radio-carbon testing dated the shroud to a date of 1260-1390 CE, with 95% confidence. The official and complete report on the experiment was published in Nature. The uncalibrated dates from the individual laboratories, with 1-sigma errors (68% confidence), were as follows:
- Tucson: 646 ± 31 years;
- Oxford: 750 ± 30 years;
- Zürich: 676 ± 24 years old;
- the unweighted mean was "691 ± 31 years", which corresponds to calibrated ages of "AD 1273 - 1288" with 68% confidence, and "AD 1262 - 1312, 1353 - 1384 cal" with 95% confidence.
As reported in Nature, Professor Bray of the Instituto di Metrologia 'G. Colonetti', Turin, "confirmed that the results of the three laboratories were mutually compatible, and that, on the evidence submitted, none of the mean results was questionable."
14 c dating fiasco shroud turin Criticisms of the dating results Radiocarbon 14 dating of the Shroud of Turin - Wikipedia, the free
The sample was part of a later repair
Although the quality of the radiocarbon testing itself is unquestioned, criticisms have been raised regarding the choice of the sample taken for testing, with suggestions that the sample may represent a medieval repair fragment rather than the image-bearing cloth. It is hypothesised that the sampled area was a medieval repair which was conducted by "invisible reweaving". Since the C14 dating at least four articles have been published in scholarly sources contending that the samples used for the dating test may not have been representative of the whole shroud.
These included an article by American chemist , who conducted chemical analysis for the and who was involved in work with the Shroud since the STURP project began in 1978. Rogers took 32 documented adhesive-tape samples from all areas of the shroud and associated textiles during the STURP process in 1978. He received 14 yarn segments from Prof. Luigi Gonella (Department of Physics, TurinPolytechnic University) on 14 October 1979, which Gonellla told him were from the Raes sample. On 12 December 2003, Rogers received samples of both warp and weft threads that Prof. Luigi Gonella claimed to have taken from the radiocarbon sample before it was distributed for dating. The actual provenance of these threads is uncertain, as Gonella was not authorized to take or retain genuine shroud material, but Gonella told Rogers that he excised the threads from the center of the radiocarbon sample.
Raymond Rogers stated in a 2005 article that he performed chemical analyses on these undocumented threads, and compared them to the undocumented Raes threads as well as the samples he had kept from his STURP work. He stated that his analysis showed: "The radiocarbon sample contains both a gum/dye/mordant coating and cotton fibers. The main part of the shroud does not contain these materials". He speculated that these products may have been used by medieval weavers to match the colour of the original weave when performing repairs and backing the shroud for additional protection. Based on this comparison Rogers concluded that the undocumented threads received from Gonella did not match the main body of the shroud, and that in his opinion: "The worst possible sample for carbon dating was taken."
As part of the testing process in 1988, Derbyshire laboratory in the UK assisted the Oxford University radiocarbon acceleration unit by identifying foreign material removed from the samples before they were processed. Professor Edward Hall of the Oxford team noticed two or three "minute" fibers which looked "out of place", and those "minute" fibers were identified as cotton by Peter South (textile expert of the Derbyshire laboratory) who said: "It may have been used for repairs at some time in the past, or simply became bound in when the linen fabric was woven. It may not have taken us long to identify the strange material, but it was unique amongst the many and varied jobs we undertake.”
The official report of the dating process, written by the people who performed the sampling, states that the sample "came from a single site on the main body of the shroud away from any patches or charred areas."
Mechthild Flury-Lemberg is an expert in the restoration of textiles, who headed the restoration and conservation of the Turin Shroud in 2002. She has rejected the theory of the "invisible reweaving", pointing out that it would be technically impossible to perform such a repair without leaving traces, and that she found no such traces in her study of the shroud.
Prof H E Gove, former professor emeritus of physics at the University of Rochester and former director of the Nuclear Structure Research Laboratory at the University of Rochester, helped to invent radiocarbon dating and was closely involved in setting up the shroud dating project. He also attended the actual dating process at the University of Arizona. Gove has written (in the respected scientific journal Radiocarbon) that: "Another argument has been made that the part of the shroud from which the sample was cut had possibly become worn and threadbare from countless handlings and had been subjected to medieval textile restoration. If so, the restoration would have had to be done with such incredible virtuosity as to render it microscopically indistinguishable from the real thing. Even modern so-called invisible weaving can readily be detected under a microscope, so this possibility seems unlikely. It seems very convincing that what was measured in the laboratories was genuine cloth from the shroud after it had been subjected to rigorous cleaning procedures. Probably no sample for carbon dating has ever been subjected to such scrupulously careful examination and treatment, nor perhaps ever will again."
In 2010, professors of statistics Marco Riani and Anthony C. Atkinson wrote in a scientific paper that the statistical analysis of the raw dates obtained from the three laboratories for the radiocarbon test suggests the presence of contamination in some of the samples. They conclude that: "The effect is not large over the sampled region … our estimate of the change is about two centuries."
In December 2010 Professor , a member of the original 1988 radiocarbon-dating team and editor of the peer-reviewed journal Radiocarbon, coauthored an article in that journal with Rachel A Freer-Waters. They examined a portion of the radiocarbon sample that was left over from the section used by the University of Arizona in 1988 for the carbon dating exercise, and were assisted by the director of the Gloria F Ross Center for Tapestry Studies. They viewed the fragment using a low magnification (~30×) stereomicroscope, as well as under high magnification (320×) viewed through both transmitted light and polarized light, and then with epifluorescence microscopy. They found "only low levels of contamination by a few cotton fibers" and no evidence that the samples actually used for measurements in the C14 dating processes were dyed, treated, or otherwise manipulated. They concluded that the radiocarbon dating had been performed on a sample of the original shroud material.
According to professor Christopher Ramsey of the Oxford Radiocarbon Accelerator Unit in 2011, "There are various hypotheses as to why the dates might not be correct, but none of them stack up."
In March 2013 Giulio Fanti, professor of mechanical and thermal measurement at the University of Padua conducted a battery of experiments on various threads that he believes were cut from the shroud during the 1988 Carbon-14 dating, and concluded that they dated from 300 B.C. to 400 A.D., potentially placing the Shroud within the lifetime of Jesus of Nazareth. Because of the manner in which Fanti obtained the shroud fibers, many are dubious about his findings. The shroud’s official custodian, Archbishop Cesare Nosiglia of Turin, told Vatican Insider: "As there is no degree of safety on the authenticity of the materials on which these experiments were carried out [on] the shroud cloth, the shroud's custodians cannot recognize any serious value to the results of these alleged experiments." Barrie Schwortz, a member of the original STURP investigation team, commented on Fanti’s theory: "But it would be more convincing if the basic research had first been presented in a professional, peer-reviewed journal. If you’re using old techniques in new ways, then you need to submit your approach to other scientists."
The dating contradicts other evidence
Raymond Rogers argued in the scientific journal Thermochimica Acta that the presence of differed markedly between the unprovenanced threads he was looking at, which contained 37% of the original vanillin, while the body of the shroud contained 0% of the original vanillin. He stated that: "The fact that vanillin cannot be detected in the lignin on shroud fibers, Dead Sea scrolls linen, and other very old linens indicate that the shroud is quite old. A determination of the kinetics of vanillin loss suggest the shroud is between 1300 and 3000 years old. Even allowing for errors in the measurements and assumptions about storage conditions, the cloth is unlikely to be as young as 840 years".
It has been stated that Roger’s vanillin-dating process is untested, and the validity thereof is suspect, as the deterioration of vanillin is heavily influenced by the temperature of its environment - heat strips away vanillin rapidly, and the shroud has been subjected to temperatures high enough to melt silver and scorch the cloth. Rogers' analysis is also questioned by skeptics such as , who reasons that the conclusions of the author, , result from "starting with the desired conclusion and working backward to the evidence".
The sample was contaminated by bacteria
Pictorial evidence dating from c. 1690 and 1842 indicates that the corner used for the dating and several similar evenly spaced areas along one edge of the cloth were handled each time the cloth was displayed, the traditional method being for it to be held suspended by a row of five bishops. Others contend that repeated handling of this kind greatly increased the likelihood of contamination by bacteria and bacterial residue compared to the newly discovered archaeological specimens for which carbon-14 dating was developed. Bacteria and associated residue (bacteria by-products and dead bacteria) carry additional carbon-14 that would skew the radiocarbon date toward the present.
Rodger Sparks, a radiocarbon expert from New Zealand, had countered that an error of thirteen centuries stemming from bacterial contamination in the Middle Ages would have required a layer approximately doubling the sample weight. Because such material could be easily detected, fibers from the shroud were examined at the National Science Foundation Mass Spectrometry Center of Excellence at the University of Nebraska. Pyrolysis-mass-spectrometry examination failed to detect any form of bioplastic polymer on fibers from either non-image or image areas of the shroud. Additionally, laser-microprobe analysis at Instruments SA, Inc. in Metuchen, New Jersey, also failed to detect any bioplastic polymer on shroud fibers.
Professor Harry Gove, director of Rochester's laboratory (one of the laboratories not selected to conduct the testing), once hypothesised that a "bioplastic" bacterial contamination, which was unknown during the 1988 testing, could have rendered the tests inaccurate. He has however also acknowledged that the samples had been carefully cleaned with strong chemicals before testing. He noted that different cleaning procedures were employed by and within the three laboratories, and that even if some slight contamination remained, about two thirds of the sample would need to consist of modern material to swing the result away from a 1st Century date to a Medieval date. He inspected the Arizona sample material before it was cleaned, and determined that no such gross amount of contamination was present even before the cleaning commenced.
The sample was contaminated by smoke or reactive carbon
Others have suggested that the silver of the molten reliquiary and the water used to douse the flames may have catalysed the airborne carbon into the cloth. The Russian , an archaeological biologist and chemist, claimed in 1994 to have managed to experimentally reproduce this purported enrichment of the cloth in ancient weaves, and published numerous articles on the subject between 1994 and 1996. Kouznetsov's results could not be replicated, and no actual experiments has been able to validate this theory, so far. Professor Gian Marco Rinaldi and others proved that Kouznetsov never performed the experiments described in his papers, citing non-existent fonts and sources, including the museums from which he claimed to have obtained the samples of ancient weaves on which he performed the experiments. The Russian was arrested in 1997 on American soil under allegations of accepting bribes by magazine editors to produce manufactured evidence and false reports.
Jull, Donahue and Damon of the NSF Arizona Accelerator Mass Spectrometer Facility at the University of Arizona attempted to replicate the Kouznetsov experiment, and could find no evidence for the gross changes in age proposed by Kouznetsov et al. They concluded that the proposed carbon-enriching heat treatments were not capable of producing the claimed changes in the measured radiocarbon age of the linen, that the attacks by Kouznetsov et al. on the 1988 radiocarbon dating of the shroud "in general are unsubstantiated and incorrect", and that the "other aspects of the experiment are unverifiable and irreproducible."
In 2008 Dr John Jackson of the Turin Shroud Center of Colorado proposed a new hypothesis – namely the possibility of more recent enrichment if carbon monoxide were to slowly interact with a fabric so as to deposit its enriched carbon into the fabric, interpenetrating into the fibrils that make up the cloth. Jackson proposed to test if this were actually possible. Professor Christopher Ramsey, the director of the Oxford University Radiocarbon Accelerator Unit, took the theory seriously and agreed to collaborate with Jackson in testing a series of linen samples that could determine if the case for the Shroud's authenticity should be re-opened. He told the BBC that "With the radiocarbon measurements and with all of the other evidence which we have about the Shroud, there does seem to be a conflict in the interpretation of the different evidence". Professor Ramsey stressed that he would be surprised if the results of the 1988 tests were shown to be far out - especially "a thousand years wrong" – but he insisted that he was keeping an open mind.
The results of the tests were to form part of a documentary on the Turin Shroud which was to be broadcast on BBC2. The producer of the 2008 documentary, David Rolfe, suggested that the quantity of carbon 14 found on the weave may have been significantly affected by the weather, the conservation methods employed throughout the centuries, as well as the volatile carbon generated by the fire that damaged the shroud while in Savoy custody at . Other similar theories include that candle smoke (rich in carbon dioxide) and the volatile carbon molecules produced during the two fires may have altered the carbon content of the cloth, rendering carbon-dating unreliable as a dating tool.
In March 2008 Professor Ramsey reported back on the testing that: "So far the linen samples have been subjected to normal conditions (but with very high concentrations of carbon monoxide). These initial tests show no significant reaction - even though the sensitivity of the measurements is sufficient to detect contamination that would offset the age by less than a single year. This is to be expected and essentially confirms why this sort of contamination has not been considered a serious issue before." He noted that carbon monoxide does not undergo significant reactions with linen which could result in an incorporation of a significant number of CO molecules into the cellulose structure. He also added that there is as yet no direct evidence to suggest the original radiocarbon dates are not accurate.
The calculations were done incorrectly
In 1994, J. A. Christen applied a strong statistical test to the radiocarbon data and concludes that the given age for the shroud is, from a statistical point of view, correct.
However critics claim to have identified statistical errors in the conclusions published in Nature: including: the actual standard deviation for the Tucson study was 17 years, not 31, as published; the chi-square distribution value is 8.6 rather than 6.4, and the relative significance level (which measures the reliability of the results) is close to 1% - rather than the published 5%, which is the minimum acceptable threshold.
14 c dating fiasco shroud turin See also Radiocarbon 14 dating of the Shroud of Turin - Wikipedia, the free
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