Applications of AMS 14C Measurements in Environmental and Economical Problems

Reevaluation of dating results for some 14C - AMS applications on the basis of the new calibration curves available

“…When the date should be corrected for radioactive decay from the year of origin to 1950, the year a tree ring sample was formed in the case of dendrochronological comparison, the physical half-life is to be used and this corresponds to the ∆ 14 C [2]. For an example of this kind of application concerning the isotopic signature of the local waters of an important Brazilian coastal upwelling, refer to [20,21].…”

The Brazilian AMS Radiocarbon Laboratory (LAC-UFF) and the Intercomparison of Results with CENA and UGAMS

“…Multidisciplinary work has been performed in the fields of archaeology, marine biology, and geosciences (Santos et al 2000(Santos et al , 2001Gomes et al 2000Gomes et al , 2004Lima et al 2002Lima et al , 2003Lima et al , 2004Barbosa JA et al 2004;Barbosa M et al 2004;Macario et al 2004Macario et al , 2009Ferraz et al 2004;Anjos et al 2010). Previous studies have addressed the chronology of prehistoric settlements of the centralsouth Brazilian coast (Lima et al 2002(Lima et al , 2003(Lima et al , 2004Barbosa M et al 2004;Macario et al 2009;Anjos et al 2010).…”

“…The material culture recovered at these sites includes artifacts made from shells and bones, and charcoal from hearths. In the region of Cabo Frio, Rio de Janeiro State, we have participated in projects in the fields of oceanography and marine ecology, investigating the isotopic signature of waters from coastal upwelling by measuring seaweed samples (Ferraz et al 2004;Gomes et al 2004) and sedimentation rates in the offshore by dating foraminifera shells (Macario et al 2004). In the Amazon region, charcoal from old fires in the rainforest of the central Amazon were studied (Gomes et al 2000;Santos et al 2000) as well as the correlation between mercury and carbon fluxes with fires by using samples from sediment cores taken from a remote lake in northern Amazonia at the Pico da Neblina National Park (Santos et al 2001;Barbosa JA et al 2004;Gomes et al 2004).…”

The Brazilian AMS Radiocarbon Laboratory (LAC-UFF) and the Intercomparison of Results with CENA and UGAMS

“…Multidisciplinary work has been performed in the fields of archaeology, marine biology, and geosciences (Santos et al 2000(Santos et al , 2001Gomes et al 2000Gomes et al , 2004Lima et al 2002Lima et al , 2003Lima et al , 2004Barbosa JA et al 2004;Barbosa M et al 2004;Macario et al 2004Macario et al , 2009Ferraz et al 2004;Anjos et al 2010). Previous studies have addressed the chronology of prehistoric settlements of the centralsouth Brazilian coast (Lima et al 2002(Lima et al , 2003(Lima et al , 2004Barbosa M et al 2004;Macario et al 2009;Anjos et al 2010).…”

“…The material culture recovered at these sites includes artifacts made from shells and bones, and charcoal from hearths. In the region of Cabo Frio, Rio de Janeiro State, we have participated in projects in the fields of oceanography and marine ecology, investigating the isotopic signature of waters from coastal upwelling by measuring seaweed samples (Ferraz et al 2004;Gomes et al 2004) and sedimentation rates in the offshore by dating foraminifera shells (Macario et al 2004). In the Amazon region, charcoal from old fires in the rainforest of the central Amazon were studied (Gomes et al 2000;Santos et al 2000) as well as the correlation between mercury and carbon fluxes with fires by using samples from sediment cores taken from a remote lake in northern Amazonia at the Pico da Neblina National Park (Santos et al 2001;Barbosa JA et al 2004;Gomes et al 2004).…”