| Project/Area Number |
07454096
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | Nara Women's University |
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Principal Investigator |
SHIOMI-TSUDA Naoko Nara Women's University, Department of Physics, Professor, 理学部・物理科学科, 教授 (40031679)
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| Co-Investigator(Kenkyū-buntansha) |
OGAWA Hidemi Nara Women's University, Department of Physics, Associate Professor, 理学部・物理科学科, 助教授 (90169194)
SAKAMOTO Naoki Nara Women's University, Department of Physics, Professor, 理学部・物理科学科, 教授 (20031718)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1995: ¥5,100,000 (Direct Cost: ¥5,100,000)
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| Keywords | Elemental Analysis / Non-vacuum PIXE method / Stone implement / Presumption of production place / Soil analysis |
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| Research Abstract |
In order to realize non-vacuum PIXE analysis we constructed a new apparatus which could lead a ion beam into the atmosphere. The appratus was installed at down-stream of a existing chamber which was used for usual vacuum PIXE analysis. A special consideration was taken for the protection of the whole accelerator system against vacuum-breaking accidents. A Kapton foil was used for the end window of the apparatus so that the window foil did not produce much background X ray. A high resolution pure germanium detector, the energy resolution of which was 135 eV for Mn K^<alpha> X ray, was used in the present measurement.
Elemental analysis was performed for samples such as obsidian, sanukite, earthenware and soil. Samples of obsidian and sanukite were collected from well-known 7 places and 2 places, respectively. Earthenware were obtained from ancient tombs. Soil samples were collected from the ruins of "Heijokyo" which was a capital city of Japan at Nara era.
From the PIXE analysis of obsidian and sanukite samples, the ratios of X ray yield for certain pairs of elements were found to have characteristic values and to be useful for classification of production places. The fluctuation of X ray yields was often observed when PIXE analysis was performed at different sampling positions. The present analysis shows that ratios of X ray yields for any two elements except Ca are almost constant and safely used for the classification.
As for elemental analysis of soil samples obtained at Heijokyo ruins we were interested in looking for the evidence that ancient people really led their lives there. The trace elements were considered to be phosphorus and sulfur which were contained in protein and lipid. We found PK_<alpha> and S K_<alpha> X ray peaks in several samples and concluded that the presence of these elements implied the existence of human lives.
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