RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 51, Issue 4
Displaying 1-6 of 6 articles from this issue
  • Shojiro KIMURA, Rumi YAMAOKI, Nami KAWAGUCHI, Junya OHTANI
    2002 Volume 51 Issue 4 Pages 149-156
    Published: April 15, 2002
    Released on J-STAGE: March 01, 2011
    JOURNAL FREE ACCESS
    The coprecipitation of radioiodine by iron (III) hydroxide flocculation method was studied as functions of pH and the concentrations of coexisting ions of the solutions for the removal of radioiodine on the water treatment system.
    The pH of the radioiodine solution included chloline water as oxidizer and iron (III) nitrate was adjusted to pH 9 to 9.5 for the precipitation of iron (III), and then readjusted to pH 4 to 6. Thus the iodate ion was absorbed by the electrostatic action on iron (III) hydroxide particle surface. The adsorption property is affected by contents of coexisting anions. Sulfate ion prevented the adsorption of iodate ion on the iron (III) hydroxide. The radioiodine removal effect at pH 6 decreased by carbonate ion, since the isoelectric point of the iron (III) hydroxide located lower pH 8.5. However, by the coexisting anions, the coagulation and settling abilities of the iron (III) hydroxide in the slightly acid solutions were improved The removal rate of radioiodine was more than 95% at pH3 to 4 of the solution, in which the anions of the natural river water level of Japan (SO42-, CO32-<0.4, 30 mg/l) were coexisted.
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  • Hiroko TANABE, Michiko GOTO, Makoto MIYAHARA
    2002 Volume 51 Issue 4 Pages 157-166
    Published: April 15, 2002
    Released on J-STAGE: March 01, 2011
    JOURNAL FREE ACCESS
    Radiation induced 2-alkylcyclobutanones (RCB) and hydrocarbons (HC) were analyzed for the detection of irradiated chicken using GC/FID analysis of simultaneous soxhletflorisil chromatography.
    In this study, 1.5μg/g ⋅fat of n pentadecane (C15: 0), 1.9μg/g⋅fat of 1-tetradecene (C1-14: 1), 0.71μg/g⋅fat of n-heptadecane (C17: 0), 0.60μg/g ⋅fat of 1-hexadecene (C1-16: 1), 3.0μg/g⋅fat of 8-heptadecene (C8-17: 1) and 4.3μg/g⋅fat of 1, 7-hexacadiene (C1, 7-16: 2) were detected from chicken irradiated at 2.7 kGy by GC/FID. At the same time, 0.53μg/g⋅fat of 2-dodecylcyclobutanone (DCB), 0.17μg/g⋅fat of 2-tetradecylcyclobutanone, 0.14μg/g⋅fat of 2-dodec-5'-enylcyclobutanone and 1.4μg/g⋅fat of 2-tetradec-5'-enylcyclobutanone (TeCB) were detected from same sample of chicken. The amount of these radiolytic products from irradiated chicken, 6HC and 4RCB, increased depending on dose increment from 0.5 kGy to 10 kGy.
    HC of C1, 7-16: 2, C8-17: 1 and TeCB were produced 9.6 nmol/kGy per 1g fat in all from oleic acid And from palmitic acid C15: 0, C1-14: 1 and DCB were produced 5.2 nmol/kGy/g⋅fat in all.
    1) Analyzing procedure of main fatty acids is complicated 2) Measurement of amount of blank of saturated HC from food sample is difficult. 3) Radiolytic products from stearic acid in chicken is low density. 4) Parent fatty acid in triglyceraide is not always same and fat in food is composed of many kind of triglyceraide. Therefore Cn-2: 1/Cn-1 is not always constant. From these four reasons, it is concluded that using ratio of Cn-2: 1 and Cn-1 for detection of irradiated food is doubtful.
    This study further shows detection of irradiated food is capable exactly using both radiation induced HC of C1, 7-16: 2, C8-17: 1 and C1-14: 1, and RCB of DCB and TeCB from main fatty acid in the food.
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  • Takao MORIMOTO, Tsutomu MIURA, Shigeru BANBA
    2002 Volume 51 Issue 4 Pages 167-173
    Published: April 15, 2002
    Released on J-STAGE: March 01, 2011
    JOURNAL FREE ACCESS
    The simple and effective method for determination of gross alpha activities of Pu and Am in environmental and concrete samples was developed. Pu and Am in the sample solution were simultaneously separated from interference elements with extraction chromatography using an Eichrom TRU. SpecTM resin column. After separation, gross alpha activities of these elements on NdF3 micro precipitation were simultaneously measured by ZnS (Ag) scintillation counter. The chemical recoveries of these elements were quantitative. The interference of natural alpha emitter could not be found from the results. The advantage of the present method is quantitative recoveries of these elements and effective purification from natural alpha emitters (Th and U) . Furthermore, the present method reduces the time and cost for sample separation.
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  • Yoshio MITO, Kei AOYAMA, Shohei MATSUBARA
    2002 Volume 51 Issue 4 Pages 174-190
    Published: April 15, 2002
    Released on J-STAGE: July 21, 2010
    JOURNAL FREE ACCESS
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  • Yuji KUGE, Ken-ichi NISHIJIMA, Nagara TAMAKI
    2002 Volume 51 Issue 4 Pages 191-194
    Published: April 15, 2002
    Released on J-STAGE: July 21, 2010
    JOURNAL FREE ACCESS
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  • 2002 Volume 51 Issue 4 Pages 195
    Published: 2002
    Released on J-STAGE: July 21, 2010
    JOURNAL FREE ACCESS
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