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  • 1 The University of Tokyo Graduate School of Agricultural and Life Sciences Tokyo Japan
  • 2 Japan Atomic Energy Research Institute Tokai Establishment 319-1195 Japan
  • 3 The University of Tokyo Graduate School of Agricultural and Life Sciences Tokyo 113-8657 Japan
  • 4 The University of Tokyo Radioisotope Center Tokyo Japan
  • 5 Sumitomo Forestry Co., Ltd Japan
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Abstract  

We have analyzed 16 elements and the radioactivity of 210Pb in a wood disk, across the annual rings to find out a promising tool for dendrochronology (chronology of wood) both for a Japanese wood, Cryptomeria japonica, and for an Indonesian rain forest wood, Alstonia, which does not form annual rings because of the relatively constant climate of the rain forest. As a result, only Mg concentration showed similar, smooth decreasing tendency in both wood species. The smooth change of the Mg concentration across the annual rings along with the growth suggested the possibility of the Mg concentration determination as a promising dendrochronological tool.