| Project/Area Number |
11559011
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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 | 展開研究 |
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| Research Field |
広領域
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| Research Institution | Osaka University |
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Principal Investigator |
NOMACHI Masaharu Osaka University, Graduate School of Science Professor, 大学院・理学研究科, 教授 (90208299)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Hiroko Osaka University, Research Assistant, 歯学部・附属病院, 医員
IWAMI Yukiaki Osaka University, Graduate School of Dentistry Assistant Professor, 大学院・歯学研究科, 助手 (90303982)
EBISU Shigeyuki Osaka University, Graduate School of Dentistry Professor, 大学院・歯学研究科, 教授 (50116000)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 2000: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1999: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | micro-beam / Fluoride distribution / Fluoride concentration / フッ素分布 |
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| Research Abstract |
Investigating the optimum fluoride concentration for the inhibition of caries may be one of key steps to know the fluoride distribution in such a micro domain as acid-resistant layer. Methods as PIGE, EPMA and SIMS can be used. Here the micro-beam PIGE was applied to obtain high position resolution.
The 1.7 MeV proton beam accelerated by the TIARA single-ended accelerator at JAERI Takasaki was delivered to a micro-beam facility. The beam spot size was about 1μm with a beam current of about 100pA.
A nuclear reaction ^<19>F(p, aγ)^<16>O was used for measuring fluorine density. Gamma rays of this reaction were detected with a 2" BGO detector. Proton induced X-rays were detected with a Si(Li) detector for measuring calcium density. Beam intensity was monitored with X-ray yield from a copper foil for quantitative analysis. The fluorine distribution was measured for etched and non-etched teeth. Observed fluorine concentration in the narrow area can be seen with sub-micron beam line at TIARA.It might contribute a new tool in dentistry.
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