RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 52, Issue 9
Displaying 1-4 of 4 articles from this issue
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  • Improved Radiation Resistance of Polypropylene by Sputtered Silica Coating
    Yoshinori KOBAYASHI, Wanhui ZHENG, Kenji ITO, Runsheng YU, Kouichi HIR ...
    2003Volume 52Issue 9 Pages 449-455
    Published: September 15, 2003
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.52.449
    JOURNAL FREE ACCESS
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    Organic polymers irradiated with high-energy radiation in the presence of oxygen are gradually oxidized through chemical reactions between free radicals and oxygen. Because oxygen permeation is responsible for radiation-induced oxidation, gas barrier coating is a promising way to improve the radiation resistance of a polymer. In the present work, oxygen barrier silica coating was attempted for 1 mm thick polypropylene by RF magnetron sputtering. Microscopic FT-IR analysis for gamma-irradiated samples showed that radiation-induced oxidation of polypropylene can be effectively suppressed by about 100 nm thick silica coating.
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  • Quantification of 11C-methionine Uptake During Proliferation of Cultured Human Cancer Cells
    Masanori SHOZUSHIMA, Reiko TSUTSUMI, Shigehiro SATO, Kazunori TERASAKI ...
    2003Volume 52Issue 9 Pages 456-463
    Published: September 15, 2003
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.52.456
    JOURNAL FREE ACCESS
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    It has been reported that 11C-methionine (Met) is taken up in greater amounts when tumor cells are actively proliferating. This observation suggests that Met uptake depends on the cell cycle. This study was aimed at investigating the relationship between the cell cycle of cultured human cancer cells and Met uptake, and obtaining basic information for Met PET interpretation. HeLa S3 cells were synchronized by the double thymidine block method, and the relationship between cells synchronized at each phase and Met uptake was investigated during 14 hours after release. As a result, Met uptake was 73% of the peak level in the early S-phase immediately after release, gradually increased, and peaked in the early G2/M phase. Subsequently, Met uptake steeply declined over the late G2/M phase to 44% in the G1 phase. These results indicate that Met uptake depends on the cell cycle : Met accumulates highly from the S through G2/M phases and maximally in the G2 phase. Met PET seems to produce images reflecting the mitotic index of tumor cells, and predicts that more rapidly progressing malignant tumors will show a higher Met uptake.
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  • Calculation of Bremsstrahlung Energy Spectrum Induced by Beta Ray
    Sigeo FUKANO
    2003Volume 52Issue 9 Pages 464-470
    Published: September 15, 2003
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.52.464
    JOURNAL FREE ACCESS
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    Bremsstrahlung energy spectra induced by beta ray from radionuclides 3H, 63Ni, 14C, 147Pm, 90Sr, 32P and 90Yare calculated by using numerical data of radiation yield published by Berger et. al. and compared with those obtained from classical approximate expressions of Wu and Segré. The results for 3H, 63Ni, 14C and 147Pm are in good agreement with those from Segré's, while spectra from such as 32P and 90Y are similar to those obtained by using Wu's expression. The result for 90Sr is in fair agreement with those from Wu's and Segré's.
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  • Imaging Agents for Serotonin Neural Function
    Yasuhiro MAGATA
    2003Volume 52Issue 9 Pages 471-474
    Published: September 15, 2003
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.52.471
    JOURNAL FREE ACCESS
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