1995 Fiscal Year Final Research Report Summary
Isotopic Analysis of Hydrogen Isotopes with Piezoelectric Quartz Crystals
| Project/Area Number |
06558073
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear fusion studies
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
MOMOSHIMA Noriyuki KYUSHU UNIVERSITY,Fac.of Sci., Dep.of Chem., Res.Associate, 理学部, 助手 (80128107)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Masatoshi Shinwadenshi Co., senior Researcher, 主任研究員
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| Project Period (FY) |
1994 – 1995
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| Keywords | Tritium / Hydrogen gas / Isotopes / Piezoelectric Quartz / Palladium |
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| Research Abstract |
An apparatus which can measure isotopic composition of hydrogen gas was constructed in relation to a future fusion reactor system, in which deuterium and tritium are used as a fuel and determination of their isotopic composition is required.
The apparatus developed us uses two piezoelectric quartz crystals of which one is coated with platinum and the other is with platinum and then palladium. Hydrogen gas can be absorbed on palladium at a pressure of higher than certain value. This pressure is called as plateau pressure. The increase in the mass of the quartz resulted in a frequency sift on the piezoelectric quartz crystal. The frequency difference of the two crystals, therefore, Pd coated and non coated, give the number of hydrogen isotopes absorbed. The sift will depend on atom weight of the hydrogen isotopes.
The frequency difference for H and D (deuterium) measured at 760 Torr showed higher affinity of H to Pd, suggesting that the same number of H and D was not absorbed on the Pd even if the same pressure. However, adaptation of working curve method would overcome this problem and isotopic composition of hydrogen would be evaluated.
Hydrogen was released from the Pd at the pressure lower than the plateau pressure. We observed a lower olateau pressure in hydrogen than deuterium, indicating again higher affinity of hydrogen to Pd than deuterium. However, if the plateau pressure was measured at mixture of hydrogen gas and non active gas for Pd such as nitrogen showed the different plateau pressure for pure hydrogen, suggesting that the partial pressure could be determined by the sift of the plateau pressure.
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