Determination of Trace Elements in Wood by Means of Tandem Van de Graaff Accelerator

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  • タンデム型パンデグラーフ加速器を用いた樹木中の微量元素分析
  • タンデム型バンデグラーフ加速器を用いた樹木中の微量元素分析
  • タンデムガタ バンデグラーフ カソクキ オ モチイタ ジュモクチュウ ノ ビリ

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Abstract

Since tree is long-lived plant and its annual rings contain many important informations about the environmental history, it has been used as biomonitor. We have been determined the amount of trace elements along the annual rings by means of instrumental thermal neutron activation analysis (INAA). In this method the elements, Na, K, Rb, Cs, Mg, Ca, Sc, Ti, V, Mn, Fe, Co, La, Ce, Sm, Al, Sb, Cl, and Br, can be analyzed with sufficient sensitivity. Unfortunately, the elements such as Pb, Cu, As, Ni, and Cd, which are closely associated with environmental pollutions, cannot be detected, or even if they can, the sensitivity of analysis is not still satisfactory. In this study, particle induced X-ray emission (PIXE) method was applied to the wood samples, and especially bombardment conditions suitable for those samples were established. The proton beam of 3.0 Mev was obtained by a Tandem Van de Graaff accelerator. The results are as follows. The damage of the sample and the volatilization of elements from the sample were not observed up to 20 nA of beam current. Addition of 10% of graphite to wood meal decreased effectively the bremsstrahlung background, and consequently increased the sensitivity of detection. Similar effect was achieved by ashing the meal at low temperature. The elements such as K, Ca, Mn, Fe, Cu, Zn, As, Pb, Rb, and Sr could be determined quantitatively.

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