RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 39, Issue 11
Displaying 1-12 of 12 articles from this issue
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  • Element Distribution in Soybean Plant Organ
    Tomoko NAKANISHI, Kikuo KUMAZAWA
    1990Volume 39Issue 11 Pages 479-481
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_479
    JOURNAL FREE ACCESS
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    Element distribution in soybean plant organ and the agar medium near the root were measured by neutron activation analysis. The concentrations of P, Mg, K and Mn were increased in the order of root, stem and leaf whereas that of Na showed the reverse tendency. In the case of halogens, Br and Cl, there was the maximum concentration in the stem. From the element profiles, the element behavior or requirement in each plant organ was discussed.
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  • Radiolabeling and Biodistribution of 62Cu-Dithiocarbamate
    —An Application for the New 62Zn/62Cu Generator—
    Kazuya MATSUMOTO, Yasuhisa FUJIBAYASHI, Junji KONISHI, Akira YOKOYAMA
    1990Volume 39Issue 11 Pages 482-486
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_482
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    The newly developed 62Zn/62Cu generator system has made available the production of the short-lived 62Cu (T1/2=9.8 min) positron radionuclide, eluted as 62Cu-glycine. In the search for 62Cu labeled radiopharmaceuticals for positron CT (PET) brain diagnostic studies, two ligands N, N-diethyl- and N, N-dimethyl- dithiocarbamic acid (DDC and DmDC) were selected, based on their Cu chelating abilities and the neutral lipophilic character of their copper chelates.
    In the present work, an in vitro study with non-radioactive Cu-glycine showed that both ligands easily formed the stable, neutral Cu-DDC and Cu-DmDC chelates (1: 2 metal-ligand complexes) based on the ligand exchange reaction. Then the 62Zn/62Cu generator eluate, the 62Cu-glycine was used for the radiolabeling of DDC and DmDC. The following HPLC analysis revealed that the ligand exchange reaction proceeded rapidly; the radiochemical purities of 62Cu-DDC and 62Cu-DmDC were extremely high (non-detectable 62Cu-glycine) and both chelates were more lipophilic than 62Cu-glycine. The mouse biodistribution of both radiolabeled compounds, 62Cu-DDC and 62Cu-DmDC indicated a brain accumulation of 2.8 and 5.3 times higher than 62Cu-glycine, 15 min post injection, respectively. The brain accumulation observed with both 62Cu-DDC and 62Cu-DmDC might be due to their stable, neutral and lipophylic character; the latter enhanced by the presence of the methylated side chains.
    The gathered results indicated the applicability of dithiocarbamic acid derivatives in the production of new 62Cu-labeled compounds using the 62Zn/62Cu generator system based on the ligand exchange reaction with 62Cu-glycine eluate. Further studies with Cu-dithiocarbamic acid derivatives for development of new generator-produced 62Cu positron radiopharmaceuticals can be recalled.
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  • Analysis of Scintigrams Using Fuzzy Theory
    Hozumi IKEDA, Yoshihiro SHIMONISHI, Masahiro OHMURA, Kenji KISHIMOTO, ...
    1990Volume 39Issue 11 Pages 487-492
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_487
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    Textural features for phantom images were extracted. Texture parameters which represent RI distribution—skew, energy, entropy and angular second moment were used. But, it was difficult to analyse the images using discriminant analysis for textural features, because textural features had statistical noise. Therefore fuzzy reasoning was adapted to analyse the images. Tetxural features for six kinds of images were showed using membership function. The possibility to the image was evaluated using the value of membership function on each images. Fuzzy reasoning could be done easily using max-min composition formula. The reasoning was founded suitable to analyse the images than discriminant analysis and will be considered usefull for analysis of clinical scintigrams.
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  • Substoichiometric Determination of Thallium (III) with Potassium Ethyl Xanthate
    P. CHANDRASEKHAR REDDY, B. RANGAMANNAR
    1990Volume 39Issue 11 Pages 493-495
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_493
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    A rapid method has been developed for the determination of thallium in mineral samples by substoichiometric radiochemical analysis. The method is based on the extraction of thallium with substoichiometric amouts of potassium ethyl xanthate into chloroform from pH 10 in ammonia buffer.The effect of foreign ions on the extraction was studied. Thallium contents of sphalerite and galena ores were determined.
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  • Substoichiometric Determination of Zinc with Potassium Ethyl Xanthate
    P. CHANDRASEKHAR REDDY, B. POLAIAH, B. RANGAMANNAR
    1990Volume 39Issue 11 Pages 496-498
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_496
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    A rapid radiochemical method has been designed for the determination of microgram quantities of zinc, based on the substoichiometric isotope dilution, using potassium ethyl xanthate as the extraction reagent, pH5.5 in acetate buffers and chloroform as the extractant were found to be suitable for quantitative substoichiometric extraction. The influence of the diverse ions on the extraction was studied. The zinc contents of a medicinal preparation and biological samples were determined by the present method.
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  • Concentration and Behavior of Radiocesium in Higher Basidiomycetes in Some Kanto and the Koshin Districts, Japan
    Hideo SUGIYAMA, Kiyoshi IWASHIMA, Hisashi SHIBATA
    1990Volume 39Issue 11 Pages 499-502
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_499
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    Concentration of 137Cs, 134Cs and potassium were measured in several higher fungi and in substrates, soils, woods and litters in some Kanto and the Koshin districts, Japan, following the Chernobyl accident during October to November 1989. 137Cs concentrations in fungi were in the range of 0.7-101 Bq kg-1⋅fresh. Maximum 137Cs level in them was observed in Boletopsis leucomelas (Pers.: Fr.) Fayod. Significantly higher levels of concentration ratios of 137Cs in fungi to substrates (e.g.; 137Cs concentration · fresh in fungus/137Cs concentration · dry in soil), 10-1 to 10×10-1, were found nearly 10 to 1000 times as much as leaf vegetables, root crops and potatoes to substrates. It was confirmed that levels of concentration ratios of potassium were similar to those of 137Cs. In all fungi, 134Cs which released from the Chernobyl accident and is not present in nuclear weapons fallout was not detected.
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  • Volume Reduction and Tritium Retention Factor in Electrolytic Enrichment of Water
    Eiji HIRAI, Nobuaki MATSUOKA, Yoshimasa TAKASHIMA
    1990Volume 39Issue 11 Pages 503-506
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_503
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    Volume reduction (N), tritium retention factor (R), tritium concentration factor (Z) and apparent separation factor (β) were measured on the large and small electrolytic cell systems. The relative variation of R was smaller than that of Z. So, it is recommended to use R in calculation of tritium concentrations in water samples. Furthermore, it was empirically revealed that R can be obtained only from N if a reliable β-value is previously known. Therefore, it is possible to obtain R without electrolysis of the tritium standard solution. Taking into account the above facts, the so-called non-spike analysis of tritium, in which electrolytic enrichment and liquid scintillation counting are combined, becomes practicable.
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  • Relationship between Aging and Renal Function: A Positron Emission Tomographic Study
    Masato YAMASHITA, Tadashi INABA, Yohei ODA, Norihiko MIZUKAWA, Shuichi ...
    1990Volume 39Issue 11 Pages 507-509
    Published: November 15, 1990
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_507
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    Blood volume (V), blood flow (F) and glomerular filtration rate (GFR) per 100 g (100 ml) of kidney were calculated with C15O, H215O and 68Ga-EDTA, to study age-related changes per unit tissue in 19 subjects using positron emission tomography. Age was negatively correlated with V, F and GFR. The agingrelated decrease in V was less marked than those in F and GFR. Analysis by regression formula induced that F, GFR for subjects in their 70 s are 76%, 46% and 55% for those in their 20 s, respectively.
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  • Measurement and Image Reconstruction of Threedimensional Radioisotope Distribution
    Eiichi TANAKA
    1990Volume 39Issue 11 Pages 510-520
    Published: November 15, 1990
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_510
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  • The Second Questionnaire Report of Safety Control on Instrument in Nuclear Medicine Laboratory
    Subcommittee of Nuclear Medicine Technology
    1990Volume 39Issue 11 Pages 521-535
    Published: November 15, 1990
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_521
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  • Measurement of Radiation Energy and Its Application (15)
    VI. Energy measurement of neutrons and its applications (1)
    Takashi NAKAMURA
    1990Volume 39Issue 11 Pages 536-546
    Published: November 15, 1990
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_536
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1990Volume 39Issue 11 Pages A63P-A116M
    Published: November 15, 1990
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.39.11_A63P
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