Extraction of shell proteins for radiocarbon dating
A marine shell, held by Brazilian scientist Eduardo Queiroz, being processed for dating by radiocarbon using an Accelerator Mass Spectrometer (AMS). Marine shells from various places on the Brazilian coast come from museums in London, Berlin and Vienna collected by explorer ships in the early 19th Century. This particular shell was found near Lagoa Santa. The object of the research project is to develop carbon-14 'offset' standards for that part of the South American coast. These 'offset' effects or deviations from the expected values have been calculated for Europe and the USA but there are few accurate values for the South America. The values that the research is establishing are necessary because the depth of the sea in some places alters the rate of carbon-14 exchange between the atmosphere and the sea-water and this irregularity needs to be taken into account in some dating calculations. Photographed at the Oxford Radiocarbon Accelerator Unit, University of Oxford, UK.
Copyright © James King-Holmes 2016.Copyright © James King-Holmes |PLUS|01-AA-662| 2016
File state: Final
Model Release: Yes
Photo size: 16.7 Mpixels (47.7 MB uncompressed) - 5000x3337 pixels (16.6x11.1 in / 42.3x28.3 cm at 300 ppi)