2000 Fiscal Year Final Research Report Summary
Study on Trace Element Analysis in Archaeological Samples by High Sensitivity Activation Analysis
| Project/Area Number |
10680176
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Cultural property science
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| Research Institution | Musashi Institute of Technology |
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Principal Investigator |
SUZUKI Shogo Musashi Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10139412)
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| Co-Investigator(Kenkyū-buntansha) |
ENDO Yukiko Musashi Institute of Technology, Faculty of Engineering, Assistant Professor, 工学部, 講師 (60287860)
HIRAI Shoji Musashi Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (30112981)
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| Project Period (FY) |
1998 – 2000
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| Keywords | neutron activation analysis / trace element / iron remain / coincidence counting method / γ-ray spectrum / spectrum analysis program / multiparameter MCA |
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| Research Abstract |
When γ-rays are counted using a γ-ray spectrometry for neutron activation analysis (NAA), Compton continum from high energy γ-rays often interfers with detection of nuclides with lower energy γ-rays. A coincidence counting of γ-rays in the cascade series with a coaxial Ge detector and a well-type NaI (Tl) detector can reduce this problem.
The coincidence counting method was applied to the determination of Se, Hf, Ba, Cs, Co, Sb, Sc in 4 kinds of certified reference materials (NIES CRM No.16 river sediment, NIES/NIRS typical Japanese diet, NIES/WAMRL fish otolith and JAC0031 river water) and 10 kind of iron remains excavated at the ruins of Kaman-Kalehoyuk in Turkey. These samples and comparative standards were irradiated for 6 h at a thermal neutron flux of 3.7×10^<12> n cm^<-2> s^<-1> in the Rikkyo University Research Reactor (TRIGA Mark-II, 100kW). The irradiated samples were couted by multiparameter MCA (LN-9000, Laboratory Equipment Corporation). A coaxial Ge detector (relative efficiency 21% and FWHM 1.8 keV at 1332 keV) was used for conventional counting method. For coincidence counting method, the coaxial Ge detector and also a well-type NaI (Tl) detector (6 in.φ ×6 in., well 3 in.φ ×4 in.) was used.
Using this method to determine Se, Hf, Ba, Cs, Co, Sb, Sc the lower limit of the determination was improved by 2-4 times compared with the conventional counting method using the coaxial Ge detector.
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