Re-Evaluation of British Museum Radiocarbon Dates Issued Between 1980 and 1984

Bowman, Sheridan; Ambers, Janet; Leese, Morven

doi:10.1017/s0033822200039953

Cited by 57 publications

(45 citation statements)

References 17 publications

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“…Another 1914C dates were measured in 1981, but only 1 (BM-1790) relates to the MBA (Burleigh 1983). Unfortunately, these 19 dates are among those measured in the British Museum laboratory during a period for which a systematic uncertainty has been identified, which affects their reliability (Tite et a1.1987;Bowman, Ambers and Leese 1990).…”

Section: Introductionmentioning

confidence: 99%

Tell Es-Sultan (Jericho): Radiocarbon Results of Short-Lived Cereal and Multiyear Charcoal Samples from the End of the Middle Bronze Age

Bruins

Plicht

1995

Radiocarbon

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.) (1995). Tell es-Sultan (Jericho): Radiocarbon results of short-lived cereal and multiyear charcoal samples from the end of the Middle Bronze Age. Radiocarbon, 37(2), 213-220. CopyrightOther than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. The multiyear charcoal yielded, as expected, a somewhat older average: 3370 ± 6 BP. Both dates are more precise than the standard deviation (Q) of the calibration curves and the absolute standard of oxalic acid. Calibration of the above Jericho dates is a bit premature, because several groups are currently testing the accuracy of both the 1986 and 1993 calibration curves. Nevertheless, preliminary calibration results are presented for comparison, based on 4 different calibration curves and 3 different computer programs. Wiggles in the calibration curves translate the precise BP dates into rather wide ranges in historical years.The final destruction of MBA Jericho occurred during the late 17th or the 16th century BC. More definite statements about the calibrated ages cannot be made until the accuracy of available calibration curves has been tested. Development of calibration curves for the Eastern Mediterranean region would be important.

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Section: Introductionmentioning

confidence: 99%

Tell Es-Sultan (Jericho): Radiocarbon Results of Short-Lived Cereal and Multiyear Charcoal Samples from the End of the Middle Bronze Age

Bruins

Plicht

1995

Radiocarbon

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“…Evidencias de las dificultades de mantener un sistema de medición de C 14 confiable, las suministra el laboratorio British Museum (Bowman et al 1990; Ambers l998), que debió recalcular las edades C 14 informadas entre los años 1980 y 1984, con diferencias de 200 a 300 años más "jóvenes". La reacción de los laboratorios fue instituir un sistema de control de calidad por intercomparación de resultados C 14 que se realizan aproximadamente cada cuatro años (Figini 1994a(Figini , 1994bFigini et al 1999).…”

Section: Intercomparación De Los Resultados Del Latyr Beta Analytic unclassified

Primer análisis de la cronología obtenida en el sitio Choya 68 (Depto. de Capayán, Provincia de Catamarca, Argentina)

et al. 2002

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RESUMEN IntroducciónEl Laboratorio de C 14 instalado en el Museo de La Plata (LATYR) procesó un conjunto de 13 muestras de carbón. Diez de ellas fueron obtenidas del interior del montículo, procedentes de un corte longitudinal E-O en uno de sus radios y seleccionadas de manera tal que quedaran aproximadamente encolumnadas, desde la superficie hasta el nivel más profundo, abarcando toda la secuencia. De las restantes, dos muestras proceden de las estructuras excavadas en el espacio este, y la última del nivel del piso de ocupación de las estructuras del sector sur. Debido a que, en conjunto, las edades radiocarbónicas obtenidas eran más tardías de lo que el conocimiento arqueológico estimaba, posteriormente, el equipo encargado de la investigación arqueológica decidió realizar una contrastación de esos fechados enviando parte de las mismas muestras a otros laboratorios, seleccionando cinco para procesar en Beta Analytic y seis en Arizona (Lab. of Isotope Geochemistry).Para explicar las diferencias observadas de los resultados interlaboratorios, e intentar establecer una cronología absoluta de este sitio arqueológi-co, analizaremos los siguientes aspectos: 1) Estrategias de excavación y aspectos estratigráficos. 2) Asociación muestra-evento arqueológico. 3) Edades radiocarbónicas obtenidas en el LATYR. 4) Conjunto de las edades obtenidas en los tres laboratorios.

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“…It is now generally acknowledged that, before the widespread introduction of full quality control measures, laboratories tended to overestimate both the accuracy and precision of 14C results-an inference supported by several intercomparison studies (e.g., Aitchison et a1.1990). Further evidence of the difficulty of maintaining a reliable 14C measurement system is provided by the decision by the British Museum to withdraw and reissue all analyses issued by the laboratory between 1980and 1984(Bowman, Ambers and Leese 1990. While this is perhaps the most spectacular example of a laboratory recognizing and attempting to correct for a flaw in its methods, it is by no means unique.…”

Section: Methodsmentioning

confidence: 99%

Dating Grimes Graves

Ambers

1997

Radiocarbon

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ABSTRACT. More radiocarbon analyses have been produced for the Neolithic flint mines of Grimes Graves than for any other site with which the British Museum's Radiocarbon Laboratory has been involved. Despite this heavy concentration of effort, a recent review of these figures concluded that poor sample selection, combined with a lack of sufficient quality assurance procedures, severely limit the use that can be made of this database. To overcome these difficulties, a redating program has been undertaken using a carefully selected subset of the original material. In this paper I discuss the flaws in the original data set, due to both technical and sampling problems; set out ways to avoid similar problems in the future, with particular ref erence to quality assurance; and discuss the new results and their archaeological implications.

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Re-Evaluation of British Museum Radiocarbon Dates Issued Between 1980 and 1984

Cited by 57 publications

References 17 publications

Tell Es-Sultan (Jericho): Radiocarbon Results of Short-Lived Cereal and Multiyear Charcoal Samples from the End of the Middle Bronze Age

Tell Es-Sultan (Jericho): Radiocarbon Results of Short-Lived Cereal and Multiyear Charcoal Samples from the End of the Middle Bronze Age

Primer análisis de la cronología obtenida en el sitio Choya 68 (Depto. de Capayán, Provincia de Catamarca, Argentina)

Dating Grimes Graves

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