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Volume 61, Issue 10
Displaying 1-5 of 5 articles from this issue
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Articles
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Takayuki HIRONIWA, Ayako YANO, Hiroshi ISHII, Chikahiro SATOH, Munetak ...2012 Volume 61 Issue 10 Pages 497-503
Published: 2012
Released on J-STAGE: October 26, 2012
JOURNAL OPEN ACCESSThermal chemiluminescence spectra of powdered black pepper were measured with a multichannel Fourier-transform spectrometer without further pretreatment. Observed spectra of γ-ray irradiated samples were modeled with Gaussian-type curves by least-squares fitting and divided into two chemiluminescence bands with maxima at 728 and 637nm, which are due to thermal oxidation of lipids and due to γ-ray irradiation, respectively. The intensity of the 637nm band increased as the irradiation dose increased, and decreased when the irradiated samples were preheated under nitrogen atmosphere, in contrast to that for the 728nm band was constant. These findings lead to the conclusion that γ-irradiation traces are conventionally detectable by chemiluminescence spectroscopy.View full abstractDownload PDF (4037K) -
Masaaki SAITO, Hiroshi IMAIZUMI, Yoshiyuki ISHII, Norio KATO2012 Volume 61 Issue 10 Pages 505-510
Published: 2012
Released on J-STAGE: October 26, 2012
JOURNAL OPEN ACCESSThe tritium concentration of initial groundwater is necessary for groundwater dating. We proposed the equation to estimate tritium concentration of initial groundwater T=R max+(1−R)min, where max is the annual maximum concentration and min is the annual minimum concentration by monthly precipitation sampling, and R is a regional constant. Tritium in precipitation was observed for three years at four sampling sites widely dispersed across Japan. The constant R for each site was calculated to be as follows:0.43 ± 0.18 for Sapporo, 0.45 ± 0.08 for Niigata, 0.23 ± 0.08 for Tokyo and 0.18 ± 0.07 for Matsuyama. The constant R did not depend on the sampling year and the tritium concentration. Utilizing observation data already published, the constant R for these sites can be used to estimate the initial groundwater tritium concentration in the past.View full abstractDownload PDF (3749K)
Note
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Keiko TAGAMI, Shigeo UCHIDA2012 Volume 61 Issue 10 Pages 511-516
Published: 2012
Released on J-STAGE: October 26, 2012
JOURNAL OPEN ACCESSField horsetail(Equisetum arvense) is a kind of fern, and the fertile shoots are eaten as vegetables in Japan in the spring. Since fern species tend to concentrate radiocaesium from soil, concentrations and distribution patterns of radiocaesium in the fertile shoots are of interest. In this study, distribution and food processing results were compared using samples collected in 2011(n＝1) and 2012(n＝3);the sample collected in 2011 received direct deposition from the Fukushima Daiichi Nuclear Power Plant accident while those collected in 2012 included radiocaesium mainly taken up from soil. About 200−300 shoots were collected at each sampling time. The 137Cs concentration in samples collected in 2012 decreased by 100−200 times compared to that in 2011. The radiocaesium distribution patterns in strobili, leaves and stems of 2012 samples were almost the same as those of 2011;however, the patterns were different from those of potassium. The radiocaesium removal percentage by food processing(washing＋boiling for 2.5min) was 70% in 2011, while that for 2012 samples was 32−72%;the effect of direct deposition and root uptake was not clear.View full abstractDownload PDF (3880K)
Letter
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Daisuke TAKATA, Eriko YASUNAGA, Keitaro TANOI, Tomoko M. NAKANISHI, Ha ...2012 Volume 61 Issue 10 Pages 517-521
Published: 2012
Released on J-STAGE: October 26, 2012
JOURNAL OPEN ACCESSComparing the peach trees planted in the containers covered the surface of soil when radioactive nuclides fell out with those non‐covered the surface, we could examine the shift of radiocaesium derived from soil to peach trees. The concentration of radiocaesium in the soil covered the surface was one sixth of that in the non‐covered soil. Regardless of the absence of cover, concentration of radiocaesium in roots was below the detection limit value. Though the content of radiocaesium in the ground part of peach trees was much more than that in the underground part, the difference in that of the ground part by the absence of cover was not observed. Therefore, it was suggested that the effect of radiocaesium in soil to the concentration of that in the ground part of peach trees would be negligible in an accident year.View full abstractDownload PDF (3102K)
Review Article
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Yasumasa MORIKAWA2012 Volume 61 Issue 10 Pages 523-529
Published: 2012
Released on J-STAGE: October 26, 2012
JOURNAL OPEN ACCESSThe trouble of 99Mo delivery that occurred in 2009 has led to the discussion of the domestic production of 99Mo. The production method that is now being considered is the neutron activation method. This method uses either 98Mo or 100Mo, whose natural abundance ratios are 24% and 10%, respectively, as the target to yield 99Mo and differs from the present fission method that uses 235U. The neutron activation method is effective in terms of the management of nuclear non-proliferation and waste disposal, but there are many issues to be solved in order to stably produce 99mTc solution that is suited for radiopharmaceutical manufacture.View full abstractDownload PDF (3993K)
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