Carbon 14 bomb pulse dating
On average, cap fragments were the youngest (average age 5.54 ± 2.6 years), core fragments were older (average age 7.79 ± 3.7 years) and interface to media fragments were the oldest (average age 9.74 ± 2.4 years).A comparison between atherosclerotic plaque samples and blood serum samples was also performed, confirming the potential influence of the sort of tissue in bomb-pulse dating.A literature investigation was carried out of the 14C/ 12C ratio in the atmosphere and oceans at different geographical locations showing that ordinary intake of marine foodstuffs can lead to age alteration (atmospheric predicted age - diet predicted age) from -2.4 to 1.4 years.14C/ 12C measurements were also conducted on blood serum from Swedish subjects and atherosclerotic plaque samples from Swedish and Portuguese patients.Once the 14C uptake ceases (e.g., at the death of an animal or when wood cellulose is formed), the 14C content of the organism starts to decrease at a rate determined by its half-life of 5730 years.This is the basis for traditional radiocarbon dating for samples older than 1950, which in favourable cases can be as precise as ±20 calendar years.The kind of tissue analysed also plays an important role, since carbon turnover times vary in different tissues and organs.Study of atherosclerotic plaque samples from different plaque regions was performed.
The tree rings used in our study included three-leaf pine (Pinus kesiya) from Doi Inthanon, Thailand (Fig.
During the growing season of northern hemisphere tree rings (May-August), Dakar and the latter sites are on different sides of the ITCZ (Fig. Dakar is located north of the summer ITCZ and receives air masses from northern mid-latitudes. 3) and strongly influenced by northern hemisphere air masses carried by the winter Asian monsoon .
Meanwhile Armidale and Tasmania remain covered by southern hemisphere air masses containing much less Figure 3: Mean positions of the Inter-Tropical Convergence Zone (ITCZ) for January and July and global atmospheric circulation together with locations of atmospheric stations (squares) and tree ring sites (circles).
The results appeared to be eligible but confirmed that many factors, except for the diet, are potentially affecting the carbon content of samples from the human body.
C analysis from cores taken from living trees of five different Callitris species [C. Ecological Modelling 211, 11–24.| Searson MJ (2000) The dendroclimatological potential of Callitris glaucophylla in the Paroo, north-western New South Wales, Honours Thesis, Department of Geography and Environmental Sciences, University of Newcastle.