Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 10, Issue 21
Displaying 1-11 of 11 articles from this issue
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  • Mass Spectrometric Study of the Rare Gases in Radioactive Minerals.
    Hitoshi Sakai
    1962 Volume 10 Issue 21 Pages 55-71
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.55
    JOURNAL FREE ACCESS
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  • Pumping Mechanism and Development of a Getter Ion Pump
    Toshio Sugita, Isao Kohno, Jiro Watanabe, Koji Kawasaki
    1962 Volume 10 Issue 21 Pages 72-82
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.72
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    A getter ion pump has been often used for the evacuation of ultra-high vacuum mass spectrometer. However, it had been found previously that diode type getter ion pump exhiblts spontaneous periodic pressure fluctuations for argon. In order to stabilize these fluctuations for inert gases, a new modification of the construction of triode type getter ion pump in some different to the triode pumps already reported elsewhere has been made. Pumping mechanisms of diode pump and our triode pump have been examined by the use of radioactive Xe131m, and some problems in these pumps have been made clear.
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  • Measurement of the Trititium Concentration in Natural Waters
    YASUSHI NISHIWAKI, HIROSHI KAWAI
    1962 Volume 10 Issue 21 Pages 83-90
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.83
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    A method of routine monitoring of tritium in natural waters is described. The water sample to be assayed is electrolyzed from 6 liters a final volume of 5 ml. or less in order to enrich the tritium concentration. The radioactivity of the enriched tritium is measured with the liquid scintillation counter. The degree of tritium enrichment is estimated from the degree of deuterium enrichment, taking into consideration of the relative rate of separation facters of tritium and deuterium by electrolysis.The tritium in the rain and tap water in Osaka city in 1957. and that in the water sampled at the Tamagawa river in Tokyo were assayed with this method, and were found to be in the order of 10-1710-16 as expressed in the atom ratio of tritium to protium(T/H). Although the tritium contents in natural waters may be expected to increase with the repeated nuclear tests, it is found that at least 1000 fold enrichment of tritium is needed for measuring the tritium content in natural waters at the present level with the liquid scintillation counter.
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  • Relative Measurements of Lithium Isotope Ratio by Surface Ionization Source I. Laboratory Standard Lithium Sulfate(Merck)
    SETSUO TANIGUCHI, OSAMU TOYAMA, TERUO HAYAKAWA
    1962 Volume 10 Issue 21 Pages 90-99
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.90
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    Relative measurements of lithium isotope ratio for lithium sulfate(Merck)have been made by using a surface ionization ion source of the triple filament type. The isotope ratio obtained by the measured point method is(7Li/6Li)M.P=12.38±0.03 and fairly coincides with the isotope ratio(7Li/6Li)I.I=12.39±0.01 by the ion current integration method.The distribution of the isotope ratios obtained by the measured point method with time is normal. The measurable isotope fractionation over the lifetime of sample evaporation is not found. The background ions emitted from the tungsten filament are also examined and their behaviours are discussed.
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  • Relative Measurements of Lithium Isotope Ratio by Surface Ionization Source I. Laboratory Standard Lithium Sulfate(Merck)
    SETSUO TANIGUCHI, OSAMU TOYAMA, TERUO HAYAKAWA
    1962 Volume 10 Issue 21 Pages 91-99
    Published: October 25, 1962
    Released on J-STAGE: February 13, 2012
    DOIhttps://doi.org/10.5702/massspec1953.10.91
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    Relative measurements of lithium isotope ratio for lithium sulfate (Merck) have been made by using a surface ionization ion source of the triple filament type. The isotope ratio obtained by the measured point method is(7Li/6Li)M.P=12.38±0.03 and fairly coincides with the isotope ratio(7Li/6Li)I.I=12.39±0.01 by the ion current integration method. The distribution of the isotope ratios obtained by the measured point method with time is normal. The measurable isotope fractionation over the lifetime of sample evaporation is not found. The background ions emitted from the tungsten filament are also examined and their behaviours are discussed.
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  • Relative Measurements of Lithium Isotope Ratio by Surface Ionization Ion Source II. Lithium Carbonate and Lithium Nitrate Prepared from Laboratory Standard Lithium Sulfate(Merck)
    SETSUO TANIGUCHI, OSAMU TOYAMA, TERUO HAYAKAWA
    1962 Volume 10 Issue 21 Pages 100-107
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.100
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    Relative measurements of the lithium isotope ratio for lithium carbonate and lithium nitrate prepared from laboratory standard lithium sulfate (Merck) have been made by using a surface ionization ion source of the triple filament type. For lithium carbonate, the isotope ratios by the measured point method varied systematically with time and the measurable isotope fractionation was observed. The isotope fractionation was discussed from the viewpoint of the isotope effect in the evaporation of lithium oxide which might be formed at the sample filament surface from lithium carbonate. The isotope ratio(7Li/6Li)for this sample moterial by the ion current integration method was measured to be 12.38 ±0.01. For lithium nitrate, the isotope ratio of 12.38 ±0.03 obtained by the measured point method well agrees with the isotope ratio 12.39 ±0.01 measured by the ion current integration method. In the course of sample preparation from laboratory standard lithium sulfate, the measurable isotope fractionation did not take place.
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  • Micro-Analysis of Lithium by Isotope Dilution Method I. Studies on Standard Solutions.
    SETSUO TANIGUCHI, IZUMI SHIONOYA, OSAMU TOYAMA, TERUO HAYAKAWA
    1962 Volume 10 Issue 21 Pages 108-112
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.108
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    The relative errors of the micro-analysis of lithium of known quantities under the condition of different error magnification factors were examined. 10-6-10-7 g order of lithium was determined with satisfactory accuracy. While, for the determination of lithium in 10-7-10-8 g order the isotope contamination seems considerably affects on the relative errors of the micro-analysis.
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  • Production of Ar38, Kr80, Kr82, and Xe128 Tracers by the Neutron Irradiation in JRR-2
    KAORU TANIGUCHI, JUN OKANO, NOBUO TAKAOKA
    1962 Volume 10 Issue 21 Pages 112-118
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.112
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    Preliminary experiments has been carried out in order to produce Xe128, Kr80, Kr82 and Ar38 tracers from the samples of potassium iodide, ammonium bromide and sodium chloride by the neutron irradiation in the reactor(JRR-2). 0.1-5.0grams of the samples were irradiated under the thermal neutron flux of4.3×1012/cm2.sec during20minutes.Gamma-rays from irradiated samples were analysed and the existences of Br82, I128 and Na24 were confirmed. After two months from the irradiation procedures, 0.1grams of the samples were heated at about1000°C in the vacuum to extract the rare gas products. The extracted gas samples were analysed with a mass spectrometer and the quantities of Xe128, Kr80, Kr82 and Ar38 were roughly estimated to be 6×10-7, 4×10-7, 1×10-7 and8×10-7 cc STP respectively. Using Xe128 gas, produced in this way, the spikes of 10-9 cc STP were prepared in order to measure the micro amount of Xe130 (double β decay product). The method for the preparation of the spikes was described.
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  • Production of Ar38, Kr80, Kr82, and Xe128 Tracers by the Neutron Irradiation in JRR-2
    KAORU TANIGUCHI, JUN OKANO, NOBUO TAKAOKA
    1962 Volume 10 Issue 21 Pages 113-119
    Published: October 25, 1962
    Released on J-STAGE: February 13, 2012
    DOIhttps://doi.org/10.5702/massspec1953.10.113
    JOURNAL FREE ACCESS
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    Preliminary experiments has been carried out in order to produce Xe128, Kr80, Kr82 and Ar38 tracers from the samples of potassium iodide, ammonium bromide and sodium chloride by the neutron irradiation in the reactor(JRR-2). 0.1-5.0 grams of the samples were irradiated under the thermal neutron flux of 4.3×1012/cm2.sec during 20 minutes.Gamma-rays from irradiated samples were analysed and the existences of Br82, I128 and Na24 were confirmed. After two months from the irradiation procedures, 0.1 grams of the samples were heated at about 1000°C in the vacuum to extract the rare gas products. The extracted gas samples were analysed with a mass spectrometer and the quantities of Xe128, Kr80, Kr82 and Ar38 were roughly estimated to be 6×10-7, 4×10-7, 1×10-7 and 8×10-7 cc STP respectively. Using Xe128 gas, produced in this way, the spikes of 10-9 cc STP were prepared in order to measure the micro amount of Xe130 (double β decay product). The method for the preparation of the spikes was described.
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  • The Measurement of the Abundance Ratio of Lithium Isotopes using Atlas CH4Mass-Spectrometer.
    YOSHIHIRO MORI, TERUNOSUKE NOMURA, HIDETAKE KAKIHANA
    1962 Volume 10 Issue 21 Pages 119-124
    Published: October 25, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.10.119
    JOURNAL FREE ACCESS
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  • The Measurement of the Abundance Ratio of Lithium Isotopes using Atlas CH4Mass-Spectrometer.
    YOSHIHIRO MORI, TERUNOSUKE NOMURA, HIDETAKE KAKIHANA
    1962 Volume 10 Issue 21 Pages 120-124
    Published: October 25, 1962
    Released on J-STAGE: February 13, 2012
    DOIhttps://doi.org/10.5702/massspec1953.10.120
    JOURNAL FREE ACCESS
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