RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 17, Issue 8
Displaying 1-12 of 12 articles from this issue
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  • Improvement in Enrichment Procedure for Analysis of Tritium in Natural Water
    Tan TAKAHASHI, Tatsuji HAMADA, Shigeru OHNO
    1968Volume 17Issue 8 Pages 357-362
    Published: August 15, 1968
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_357
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    In the electrolytic enrichment process of tritium in water, the relationship between the separation factor of deuterium (α) and that of tritium (β) was re-examined using electrodes made of various materials. By the use of the nickel-nickel electrode unit and the small glass cell incorporating up to 100 ml of water, a good constancy of β was obtained for the volume reduction ratio ranging from 1/12 to 1/23, which enables us to determine the enrichment factor with an accuracy of ±6% dispensing with the deuterium analysis. With the large metallic cell for the initial sample volume of up to 1 liter, the relationship between α and β was found to be well approximated by Östlund's formula with an accuracy of ±10%.
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  • Sorption and Fixation of 137Cs by Sericite
    Takashi MATSUMURA
    1968Volume 17Issue 8 Pages 363-367
    Published: August 15, 1968
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_363
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    Sericite, which is one of 2: 1 layer lattice clays with unexpended 10Å c-spacing, was found to be effective for removal of 137Cs from waste solution. About 95 per cent of 137Cs is removed by the addition of 500 ppm of Na-form sericite into the waste solution. The removals are satisfactorily high at the pH range between 3 and 10 and decrease abruptly at a pH lower than 2. The removal is not influenced by the presence of about 1, 000 ppm of competing Na or Ca ion concentration, however, remarkably decreases by the presence of competing K or Cs ion. 137Cs is “fixed” in the lattice structure of sericite and is not entirely desorbed by the different leaching solutions. However, about 20 per cent of “fixed” 137Cs is desorbed by the primary amine solutions. This behavior suggests that about 80 per cent of sorbed 137Cs enters at the interlayer and 20 per cent at the interlattice edge or the external planner edge of sericite.
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  • Vapor-Phase Graft Copolymerization of Vinyl Chloride and Vinylidene Chloride on Polypropylene
    Simultaneous Irradiation Grafting by Sealed Ampoule Method
    Kiyoshi HAYAKAWA, Kaoru KAWASE, Tatsuo MATSUDA
    1968Volume 17Issue 8 Pages 368-373
    Published: August 15, 1968
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_368
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    The graft copolymerization of gaseous monomers on polypropylene fibers has been carried out by a simultaneous irradiation technique. The fibers suspended in the middle of the ampoules were exposed to the vapor of vinyl chloride or vinylidene chloride, and irradiated by the γ-rays from 60Co. The vapor pressure of monomers was adjusted by changing the temperature of the liquid monomer. In the vinylidene chloride-grafting the rate of grafting was proportional to the vapor pressure of the monomer and also to the 0.73 th power of the dose rate. The rise in irradiation temperature brought about a marked decrease in the rate, the apparent activation energy o f the grafting being -8.0 kcal/mol. In the vinyl chloride-grafting, the rate of grafting was proportional to the vapor pressure, too, but proportional to the 1.1 th power of the dose rate. The apparent activation energy was almost null. A considerable homopolymer formation and fairly remarkable post-grafting were observed in both vinylidene chloride- and vinyl chloride-grafting.
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  • Studies on the Distribution of Radioisotopes by Whole Body Autoradiography (XIII)
    Distribution of 3H-1- (3, 4, 5-trimethoxybenzyl) -6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline in Mice and Rats
    Tadao TAKAHASHI, Yoshishige SATO
    1968Volume 17Issue 8 Pages 374-381
    Published: August 15, 1968
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_374
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    A new bronchodilating agent l-1- (3, 4, 5-trimethoxybenzyl) -6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline (AQL-208) and its optical isomer were labelled with tritium and the distribution of radioactivity has been studied b y means of the whole body autoradiographic technique in adult male mice, pregnant mice and rats injected with the labelled compounds intravenously.
    Ten minutes after injection of 3H-AQL-208 to male mice,
    1) The highest concentration of the radioactivity was present in the gall bladder and gastrointestinal contents.
    2) The radioactivity in the hypophysis and adrenal medulla accumulated more markedly than in most other organsa.
    3) The radioactivity was also observed in the liver, kidney, lung, muscle, salivary gland and skin but not in the central nervous system.
    At three hours, the levels of the radioactivity in various organs decreased remarkably whereas the radioactivity in the large intestinal contents increased.
    When mice were injected with the labelled d-isomer and dl-racemate, the patterns of distribution of the isotope were similar to that with the l-isomer.
    The levels of the radioactivity in the fetal organs 30 minutes after injection of 3H-AQL-208 to the mother were lower than those in the maternal organs, and the radioactivity in the fetus decreased rapidly thereafter. Species difference in the autoradiographic distribution of 3H-AQL-208 was not observed between mouse and rat.
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  • Induction of Mutations by Chronic Gamma Exposure of Rice Plant Growing without Fertilizing
    Hikoyuki YAMAGUCHI
    1968Volume 17Issue 8 Pages 382-387
    Published: August 15, 1968
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_382
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    The main advantage of gamma (-irradiation) fields is in the ease with which chronic treatments can be made at any desired exposure-rate. This prompted to see whether any part of genetic effect of radiation could be changed if plants raised without application of fertilizers were chronically irradiated. Experimental results showed that the effect of a lack of fertilizer was not significantly noticed.
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  • Solvent Extraction of Cobalt (II) with HTTA and Pyridine
    Hiroshi Kawamoto
    1968Volume 17Issue 8 Pages 388-390
    Published: August 15, 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_388
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  • Separation and Quantitative Determination of 14C-lipids by Means of Thin-layer Chromatography
    N. Kimura, [in Japanese], [in Japanese], [in Japanese], [in Japanese], ...
    1968Volume 17Issue 8 Pages 391-394
    Published: August 15, 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_391
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  • Radiation Dose Absorbed in Embryo of Dry Rice Seed
    Hikoyuki YAMAGUCHI
    1968Volume 17Issue 8 Pages 395-397
    Published: August 15, 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_395
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  • [title in Japanese]
    [in Japanese]
    1968Volume 17Issue 8 Pages 398-409
    Published: August 15, 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_398
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  • [title in Japanese]
    [in Japanese]
    1968Volume 17Issue 8 Pages 410-418
    Published: August 15, 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_410
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  • ERRATUM
    1968Volume 17Issue 8 Pages e1
    Published: 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_e1
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  • [title in Japanese]
    1968Volume 17Issue 8 Pages A883-A448
    Published: August 15, 1968
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.17.8_A883
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