1999 Fiscal Year Final Research Report Summary
Fundamental research for rare gas MRI
| Project/Area Number |
09559017
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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 | High Energy Accelerator Research Organization |
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Principal Investigator |
ADACHI Toshikazu Accelerator Laboratory, High Energy Accelerator Research Organization, Associate Professor, 加速器研究施設, 助教授 (80141977)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIMOTO Shigeru Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Research Associate, 素粒子原子核研究所, 助手 (50141974)
MORIMOTO Kimio Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Professor, 素粒子原子核研究所, 教授 (10011579)
MASUDA Yasuhiro Institute of Materials Structure Science, High Energy Accelerator Research Organization, Associate Professor, 物質構造科学研究所, 助教授 (60150009)
INO Takashi Institute of Materials Structure Science, High Energy Accelerator Research Organization, Research Associate, 物質構造科学研究所, 助手 (10301722)
MUTO Takeshi Institute of Materials Structure Science, High Energy Accelerator Research Organization, Research Associate, 物質構造科学研究所, 助手 (90249904)
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| Project Period (FY) |
1997 – 1999
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| Keywords | MRI / nuclear polarization / laser / optical pumping / NMR |
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| Research Abstract |
A cylindrical sapphire single crystal cell has been developed for 3He nuclear polarization for a MRI study. The cell was filled with 4-atm 3He gas, a small amount of rubidium droplet and 100 Torr nitrogen gas. The c axis of the single crystal was parallel to the disk of the cylinder. The disk worked as a widow for a laser beam for and optical pumping of rubidium atomic polarization. The sapphire single crystal has birefringence. The refractive index depends on the direction of the wave oscillation. The phase shift upon passage through the birefringence window depends on the oscillation direction. The circular polarization of incident laser is depolarized because of the phase shift. A same size of sapphire plate compensated for the phase shift. The rubidium polarization is transferred to 3He nuclear polarization upon atomic collision via a hyperfine interaction. The 3He nuclear polarization was monitored by a NMR detection. After the buid-up of the 3He nuclear polarization, the laser was switched off for an observation of 3He polarization relaxation. The relaxation time of the 3He polarization was 40 h. In the case of glass cell, we usually obtained one such cell from 10 cells. The result shows the sapphire is good material for 3He polarization. This is the first test of 3He polarization in sapphire cell
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