Radiocarbon dating of a very large grandidier baobab, the giant of Bevoay
Studia Universitatis Babe?-Bolyai Chemia
The article presents the AMS (accelerator mass spectrometry) radiocarbon dating results of the Giant of Bevoay, which is a very large Grandidier baobab (Adansonia grandidieri Baill.) of Madagascar. The investigation of this baobab shows that it has a cluster structure, which consists of 3 perfectly fused stems. The calculated wood volume of the tree is 520 m 3 , which makes it the third largest Grandidier baobab and also the third largest individual of all Adansonia species. Two samples were
... lected from the outer part of the stems. The oldest dated sample segment had a radiocarbon date of 525 ± 23 BP, which corresponds to a calibrated age of 585 ± 10 years. According to this value, the Giant of Bevoay is 825 ± 50 years old. 157 EXPERIMENTAL SECTION Sample collection. The investigated wood sample was collected with a Haglöf CH 800 increment borer (0.80 m long, 0.0108 m inner diametre). A number of four tiny pieces/segments, of the length of 10 -3 m, were extracted from predetermined positions along the sample. The segments were processed and investigated by AMS radiocarbon dating. Sample preparation. The α-cellulose pretreatment method was used for removing soluble and mobile organic components  . The resulting samples were combusted to CO 2, which was next reduced to graphite on iron catalyst [25, 26] . The resulting graphite samples were analysed by AMS. AMS measurements. The radiocarbon measurements were done at the AMS Facility of the iThemba LABS, Johannesburg, Gauteng, South Africa, using the 6 MV Tandem AMS system  . In all cases, the obtained fraction modern values were finally converted to a radiocarbon date. The radiocarbon dates and errors were rounded to the nearest year. Calibration. Radiocarbon dates were calibrated and converted into calendar ages with the OxCal v4.4 for Windows  , by using the SHCal20 atmospheric data set  .