RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
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Volume 56, Issue 1
Displaying 1-5 of 5 articles from this issue
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  • Tritium Measurement without Background Counting for Water Sample Treated with Electrolysis Enrichment
    Masaaki SAITO, Hiroshi IMAIZUMI, Norio KATO, Yoshiyuki ISHII, Yuta TAK ...
    2007Volume 56Issue 1 Pages 1-6
    Published: January 15, 2007
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.56.1
    JOURNAL FREE ACCESS
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    The difference of count rate between an enriched tritium sample and the non-enriched sample is the product of the net count rate and (enrichment factor-1) . The relationship gives net count rate without background deduction. This method was applied to tritium water treated by electrolysis enrichment and the result was verified. The reliability and error of the measurement were comparable with the conventional measurement. This measurement was found to be useful for tritium enrichment analysis.
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  • Thermoluminescence (TL) -Glowcurves from Some Feldspars and Stability of Far-red TL from Albite
    Tetsuo HASHIMOTO, Hisanobu SAKAUE, Tomoyuki TAKEUCHI, Naoki MITAMURA
    2007Volume 56Issue 1 Pages 7-16
    Published: January 15, 2007
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.56.7
    JOURNAL FREE ACCESS
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    An on-line spectrometry of several museum feldspar specimens showed two broad TL-emissions around 150-200°C, separable into a blue thermoluminescence (BTL, having a peak at 450 nm) covering 350-550 nm and a far-red TL (far-RTL, giving a peak at 710 nm) ranging 650-760 nm in wavelengths. TL-glowcurve shapes and the dose-response of TL sensitivity showed a certain dependency not only on the far-RTL or BTL-detection, but also on kinds of feldspar samples. Particularly, alkaline feldspars gave higher sensitivity in comparison with plagioclase with Ca-rich feldspar.
    Concerning the albite as one kind of feldspar, the far-RTL showed negligibly small fading rate within a few percentages, whereas the BTL gave up to 18% reduction after the storage for 7 months at room temperature. The results revealed that the far-RTL source would be stable and preferable for the TL dating in spite of intrinsically weak intensity, estimated in the detective limitation in a few Gy, equivalent to archaeological burnt feldspar constituents approximately 1 000 years ago. Finally, a far-RTL emission mechanism was assigned to the participation of electric charge transfer on Fe2+ from Fe3+-impurity rather than the mechanism of energy transfer into Fe3+.
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  • Calibration of Dose Calibrator Using 18F-FDG for Quality Control of PET Radiopharmaceuticals
    Chie TORAMATSU, Toshikazu SUZUKI, Toshimitsu FUKUMURA, Kazutoshi SUZUK ...
    2007Volume 56Issue 1 Pages 17-26
    Published: January 15, 2007
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.56.17
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    A working standard calibrated by 18F-FDG was introduced in order to ensure the traceability in PET radiopharmaceuticals produced in the National Institute of Radiological Sciences (NIRS) . A dose calibrator (ALOKA IGC-7) modified for remote calibration under the direction of the National Institute of Advanced Industrial Science and Technology (AIST) was adopted as a working standard. The same type of the calibrator is also used as a mediate detector by the Japan Radioisotope Association (JRIA) . Using the same 18FFDG produced in NIRS, comparative measurements were carried out between NIRS and JRIA, the certificate authority which has the secondary standard. These indicated values for 18F-FDG were consistent in a range with an uncertainty of 3.2%.Thus, traceability of the working standard with the national standard was established. A calibration system for all RI dose calibrators used in NIRS arranged with this working standard is described.
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  • Quench Correction by External Standard Source 152Eu Exchanged for Originally Equipped 226Ra
    Takahisa KATO
    2007Volume 56Issue 1 Pages 27-31
    Published: January 15, 2007
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.56.27
    JOURNAL FREE ACCESS
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    The external standard source of liquid scintillation counter, 226Ra, was exchanged to 152Eu. Quench correction curves by irradiating the radiation to quenched standard samples for a single labeled 3H or 14C, or dual labeled 3H and 14C, were plotted by the computer software that controls the liquid scintillation counting system. Using the correction curve, the radioactivity of quenched standard sample for making correction curves, was determined again quantitatively. The most of corrected values were within ±5% error of the nominal radioactivity of the standard sample.
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  • Effect of Drugs on Biodistribution of Radiopharmaceuticals
    Subcommittee of Radiopharmaceuticals
    2007Volume 56Issue 1 Pages 33-46
    Published: January 15, 2007
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.56.33
    JOURNAL FREE ACCESS
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