RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 52, Issue 7
Displaying 1-5 of 5 articles from this issue
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  • Comparative Evaluation of Effects of γ-Rays and Heavy Metals on Mobility of the Water Flea Daphnia magna
    Shoichi FUMA, Nobuyoshi ISHII, Nobuyuki TANAKA, Hiroshi TAKEDA, Kiriko ...
    2003Volume 52Issue 7 Pages 319-326
    Published: July 15, 2003
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.52.319
    JOURNAL FREE ACCESS
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    The authors comparatively studied effects of γ-rays and some heavy metal treatments on mobility of water flea Daphnia magna according to the OECD Guideline for Testing of Chemicals, which is generally used for ecotoxicity evaluation of chemicals. The 50% effect dose at 24 hours after γ-irradiation (ED50/24h) was 1 600 Gy. The 50% effect concentrations following 24 hours exposure for manganese, nickel and copper (EC50/24h) were 990, 180 and 3.3 μM, respectively. The Gy-equivalent factors (=ED50/24h/EC50/24h) were therefore calculated as 1.6, 8.9 and 480 for manganese, nickel and copper, respectively. These factors indicate that toxicity of these metals to D. magna can be ranked in an order of Mn<Ni<Cu. This toxicity rank shows a similar trend to that evaluated previously in the experimental model ecosystem (microcosm) consisting of three species of aquatic microorganisms. However, there was a noteworthy difference in the toxicity ranks obtained from the D. magna immobilization test and the microcosm test, suggesting that ecotoxicity ranking should be carried out by integrated evaluation on the basis of various ecotoxicity tests.
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  • Exposure Doses of Interventional Cardiologist during Intracoronary Radiotherapy with Phosphorus-32
    Atsushi FUKUDA, Keitaro KITABAYASHI, Yoshiharu IWADATE, Ichiro YAMAGUC ...
    2003Volume 52Issue 7 Pages 327-334
    Published: July 15, 2003
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.52.327
    JOURNAL FREE ACCESS
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    Background : In our center, clinical trial with 32P began in June 2001. This new medical treatment method is expected to be a promising cure with few side effects. To establish the validity of a new treatment method, it is necessary to evaluate the efficacy of treatment and secure the safety of interventional cardiologists. This study evaluates the exposure dose of the interventional cardiologists during intracoronary radio-therapy with 32P (5.5 GBq) .
    Method : We measured the amount of beta ray irradiation using a rate of H' (0.07, 0°), detained in the centering catheter. Then, we measured braking radiation dose using H' (10, 0°) of 32P, with the original phantom.
    Results : Exposure dose of interventional cardiologists during this new treatment was 2.0 μSv/procedure as an effective dose. The radiation dose at the intracoronary radiotherapy is relatively less compared with conventional X-ray medical radiation techniques. However, the interventional cardiologist is exposed mainly when a radioactive source is outside of a patient [H' (10, 0°) : 1.0 μSv and H' (0.07, 0°) : 100μSv] .
    Conclusion : They should take a distance from a source or protect beta ray during the transit of 32P from SDU (source delivery unit) to patient and return to SDU after therapy.
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  • Influence of Temperature to Quenching on Liquid Scintillation Measurement
    Takahisa KATO
    2003Volume 52Issue 7 Pages 335-339
    Published: July 15, 2003
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.52.335
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    The amount of quench is measured with liquid scintillation spectrometer changing the temperature of the sample. The range of the changed temperature is between 0°C and 35°C. The measurement is carried out for three kinds of unquenched standard, two quenched standards and fifteen kinds of scintillation cocktail and the mixed sample. It is confirmed that the amount of quench increases for all samples as the temperature rises. The influence of the changed amount of quench to the quench correction is examined.
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  • Report on the Present Status of Scientific and Engineering Accelerators in Japan (I)
    Specialist Committee of Quantum Beam
    2003Volume 52Issue 7 Pages 340-361
    Published: July 15, 2003
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.52.340
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • Radiotherapy in Japan and International Comparison
    Keiichi NAKAGAWA
    2003Volume 52Issue 7 Pages 363-365
    Published: July 15, 2003
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.52.363
    JOURNAL FREE ACCESS
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